fix windows build.

Gate Linux-specific imports and fields to avoid Windows dead-code/unused warnings.
Ensure Linux-only proc CPU tracker is not referenced on non-Linux builds.

.github/workflows/ci.yml

@@ -2,6 +2,7 @@ name: CI
 on:
   push:
   pull_request:
+
 jobs:
   build:
     strategy:
@@ -11,9 +12,103 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy, rustfmt
+      - name: Install system dependencies
+        if: matrix.os == 'ubuntu-latest'
+        run: sudo apt-get update && sudo apt-get install -y libdrm-dev libdrm-amdgpu1
       - name: Cargo fmt
         run: cargo fmt --all -- --check
       - name: Clippy
-        run: cargo clippy --all-targets --all-features -D warnings
+        run: cargo clippy --all-targets --all-features -- -D warnings
-      - name: Build
+      - name: Build (release)
-        run: cargo build --release --workspace
+        run: cargo build --release --workspace
+      - name: Start agent (Ubuntu)
+        if: matrix.os == 'ubuntu-latest'
+        shell: bash
+        run: |
+          set -euo pipefail
+          # Use debug build for faster startup in CI
+          RUST_LOG=info cargo run -p socktop_agent -- -p 3000 &
+          AGENT_PID=$!
+          echo "AGENT_PID=$AGENT_PID" >> $GITHUB_ENV
+          # Wait for port 3000 to accept connections (30s max)
+          for i in {1..60}; do
+            if bash -lc "</dev/tcp/127.0.0.1/3000" &>/dev/null; then
+              echo "agent is ready"
+              break
+            fi
+            sleep 0.5
+          done
+      - name: Run WS probe test (Ubuntu)
+        if: matrix.os == 'ubuntu-latest'
+        shell: bash
+        env:
+          SOCKTOP_WS: ws://127.0.0.1:3000/ws
+        run: |
+          set -euo pipefail
+          cargo test -p socktop --test ws_probe -- --nocapture
+      - name: Stop agent (Ubuntu)
+        if: always() && matrix.os == 'ubuntu-latest'
+        shell: bash
+        run: |
+          if [ -n "${AGENT_PID:-}" ]; then kill $AGENT_PID || true; fi
+      - name: Start agent (Windows)
+        if: matrix.os == 'windows-latest'
+        shell: pwsh
+        run: |
+          $p = Start-Process -FilePath "cargo" -ArgumentList "run -p socktop_agent -- -p 3000" -PassThru
+          echo "AGENT_PID=$($p.Id)" | Out-File -FilePath $env:GITHUB_ENV -Append
+          $ready = $false
+          for ($i = 0; $i -lt 60; $i++) {
+            if (Test-NetConnection -ComputerName 127.0.0.1 -Port 3000 -InformationLevel Quiet) { $ready = $true; break }
+            Start-Sleep -Milliseconds 500
+          }
+          if (-not $ready) { Write-Error "agent did not become ready" }
+      - name: Run WS probe test (Windows)
+        if: matrix.os == 'windows-latest'
+        shell: pwsh
+        run: |
+          $env:SOCKTOP_WS = "ws://127.0.0.1:3000/ws"
+          cargo test -p socktop --test ws_probe -- --nocapture
+      - name: Stop agent (Windows)
+        if: always() && matrix.os == 'windows-latest'
+        shell: pwsh
+        run: |
+          if ($env:AGENT_PID) { Stop-Process -Id $env:AGENT_PID -Force -ErrorAction SilentlyContinue }
+      - name: Smoke test (client --help)
+        run: cargo run -p socktop -- --help
+      - name: Package artifacts
+        shell: bash
+        run: |
+          set -e
+          mkdir dist
+          if [[ "${{ matrix.os }}" == "windows-latest" ]]; then
+            cp target/release/socktop.exe dist/
+            cp target/release/socktop_agent.exe dist/
+            7z a socktop-${{ matrix.os }}.zip dist/*
+          else
+            cp target/release/socktop dist/
+            cp target/release/socktop_agent dist/
+            tar czf socktop-${{ matrix.os }}.tar.gz -C dist .
+          fi
+      - name: Upload build artifacts (ephemeral)
+        uses: actions/upload-artifact@v4
+        with:
+          name: socktop-${{ matrix.os }}
+          path: |
+            *.tar.gz
+            *.zip
+      - name: Upload to rolling GitHub Release (main only)
+        if: github.ref == 'refs/heads/main' && github.event_name == 'push'
+        uses: softprops/action-gh-release@v2
+        with:
+          tag_name: latest
+          name: Latest build
+          prerelease: true
+          draft: false
+          files: |
+            *.tar.gz
+            *.zip
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.vscode/launch.json

@@ -0,0 +1,83 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+
+        {
+            "type": "lldb",
+            "request": "launch",
+            "name": "Debug executable 'socktop'",
+            "cargo": {
+                "args": [
+                    "build",
+                    "--bin=socktop",
+                    "--package=socktop"
+                ],
+                "filter": {
+                    "name": "socktop",
+                    "kind": "bin"
+                }
+            },
+            "args": ["ws://127.0.0.1:3000/ws"],
+            "cwd": "${workspaceFolder}"
+        },
+        {
+            "type": "lldb",
+            "request": "launch",
+            "name": "Debug unit tests in executable 'socktop'",
+            "cargo": {
+                "args": [
+                    "test",
+                    "--no-run",
+                    "--bin=socktop",
+                    "--package=socktop"
+                ],
+                "filter": {
+                    "name": "socktop",
+                    "kind": "bin"
+                }
+            },
+            "args": [],
+            "cwd": "${workspaceFolder}"
+        },
+        {
+            "type": "lldb",
+            "request": "launch",
+            "name": "Debug executable 'socktop_agent'",
+            "cargo": {
+                "args": [
+                    "build",
+                    "--bin=socktop_agent",
+                    "--package=socktop_agent"
+                ],
+                "filter": {
+                    "name": "socktop_agent",
+                    "kind": "bin"
+                }
+            },
+            "args": [],
+            "cwd": "${workspaceFolder}"
+        },
+        {
+            "type": "lldb",
+            "request": "launch",
+            "name": "Debug unit tests in executable 'socktop_agent'",
+            "cargo": {
+                "args": [
+                    "test",
+                    "--no-run",
+                    "--bin=socktop_agent",
+                    "--package=socktop_agent"
+                ],
+                "filter": {
+                    "name": "socktop_agent",
+                    "kind": "bin"
+                }
+            },
+            "args": [],
+            "cwd": "${workspaceFolder}"
+        }
+    ]
+}

Cargo.lock

@@ -253,6 +253,16 @@ dependencies = [
  "static_assertions",
 ]
 
+[[package]]
+name = "core-foundation"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2a6cd9ae233e7f62ba4e9353e81a88df7fc8a5987b8d445b4d90c879bd156f6"
+dependencies = [
+ "core-foundation-sys",
+ "libc",
+]
+
 [[package]]
 name = "core-foundation-sys"
 version = "0.8.7"
@@ -268,6 +278,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "crc32fast"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9481c1c90cbf2ac953f07c8d4a58aa3945c425b7185c9154d67a65e4230da511"
+dependencies = [
+ "cfg-if",
+]
+
 [[package]]
 name = "crossterm"
 version = "0.27.0"
@@ -403,6 +422,16 @@ dependencies = [
  "windows-sys 0.60.2",
 ]
 
+[[package]]
+name = "flate2"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4a3d7db9596fecd151c5f638c0ee5d5bd487b6e0ea232e5dc96d5250f6f94b1d"
+dependencies = [
+ "crc32fast",
+ "miniz_oxide",
+]
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -531,7 +560,34 @@ checksum = "335ff9f135e4384c8150d6f27c6daed433577f86b4750418338c01a1a2528592"
 dependencies = [
  "cfg-if",
  "libc",
- "wasi",
+ "wasi 0.11.1+wasi-snapshot-preview1",
+]
+
+[[package]]
+name = "getrandom"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "26145e563e54f2cadc477553f1ec5ee650b00862f0a58bcd12cbdc5f0ea2d2f4"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "r-efi",
+ "wasi 0.14.2+wasi-0.2.4",
+]
+
+[[package]]
+name = "gfxinfo"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14f33b12fba19d158bebe0262fd2b6c49fee6f0e0e089f4f3fdc11c017548473"
+dependencies = [
+ "core-foundation",
+ "io-kit-sys",
+ "libdrm_amdgpu_sys",
+ "nvml-wrapper",
+ "serde",
+ "windows 0.61.3",
+ "wmi",
 ]
 
 [[package]]
@@ -650,7 +706,7 @@ dependencies = [
  "js-sys",
  "log",
  "wasm-bindgen",
- "windows-core",
+ "windows-core 0.61.2",
 ]
 
 [[package]]
@@ -794,6 +850,16 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "io-kit-sys"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "617ee6cf8e3f66f3b4ea67a4058564628cde41901316e19f559e14c7c72c5e7b"
+dependencies = [
+ "core-foundation-sys",
+ "mach2",
+]
+
 [[package]]
 name = "io-uring"
 version = "0.7.9"
@@ -842,6 +908,25 @@ version = "0.2.174"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1171693293099992e19cddea4e8b849964e9846f4acee11b3948bcc337be8776"
 
+[[package]]
+name = "libdrm_amdgpu_sys"
+version = "0.8.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a7bf95f3c5d8a8ae4a5c0c46fe2271c16fdf8fd4b26978f44b082a0f8ebaaae"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "libloading"
+version = "0.8.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "07033963ba89ebaf1584d767badaa2e8fcec21aedea6b8c0346d487d49c28667"
+dependencies = [
+ "cfg-if",
+ "windows-targets 0.53.3",
+]
+
 [[package]]
 name = "linux-raw-sys"
 version = "0.4.15"
@@ -879,6 +964,15 @@ dependencies = [
  "hashbrown",
 ]
 
+[[package]]
+name = "mach2"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d640282b302c0bb0a2a8e0233ead9035e3bed871f0b7e81fe4a1ec829765db44"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "matchers"
 version = "0.1.0"
@@ -923,7 +1017,7 @@ checksum = "a4a650543ca06a924e8b371db273b2756685faae30f8487da1b56505a8f78b0c"
 dependencies = [
  "libc",
  "log",
- "wasi",
+ "wasi 0.11.1+wasi-snapshot-preview1",
  "windows-sys 0.48.0",
 ]
 
@@ -935,7 +1029,7 @@ checksum = "78bed444cc8a2160f01cbcf811ef18cac863ad68ae8ca62092e8db51d51c761c"
 dependencies = [
  "libc",
  "log",
- "wasi",
+ "wasi 0.11.1+wasi-snapshot-preview1",
  "windows-sys 0.59.0",
 ]
 
@@ -967,6 +1061,29 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "nvml-wrapper"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c9bff0aa1d48904a1385ea2a8b97576fbdcbc9a3cfccd0d31fe978e1c4038c5"
+dependencies = [
+ "bitflags",
+ "libloading",
+ "nvml-wrapper-sys",
+ "static_assertions",
+ "thiserror 1.0.69",
+ "wrapcenum-derive",
+]
+
+[[package]]
+name = "nvml-wrapper-sys"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "698d45156f28781a4e79652b6ebe2eaa0589057d588d3aec1333f6466f13fcb5"
+dependencies = [
+ "libloading",
+]
+
 [[package]]
 name = "objc2-core-foundation"
 version = "0.3.1"
@@ -1090,6 +1207,12 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "r-efi"
+version = "5.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "69cdb34c158ceb288df11e18b4bd39de994f6657d83847bdffdbd7f346754b0f"
+
 [[package]]
 name = "rand"
 version = "0.8.5"
@@ -1097,8 +1220,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
  "libc",
- "rand_chacha",
+ "rand_chacha 0.3.1",
- "rand_core",
+ "rand_core 0.6.4",
+]
+
+[[package]]
+name = "rand"
+version = "0.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6db2770f06117d490610c7488547d543617b21bfa07796d7a12f6f1bd53850d1"
+dependencies = [
+ "rand_chacha 0.9.0",
+ "rand_core 0.9.3",
 ]
 
 [[package]]
@@ -1108,7 +1241,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core",
+ "rand_core 0.6.4",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3022b5f1df60f26e1ffddd6c66e8aa15de382ae63b3a0c1bfc0e4d3e3f325cb"
+dependencies = [
+ "ppv-lite86",
+ "rand_core 0.9.3",
 ]
 
 [[package]]
@@ -1117,7 +1260,16 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom",
+ "getrandom 0.2.16",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "99d9a13982dcf210057a8a78572b2217b667c3beacbf3a0d8b454f6f82837d38"
+dependencies = [
+ "getrandom 0.3.3",
 ]
 
 [[package]]
@@ -1366,11 +1518,12 @@ dependencies = [
 
 [[package]]
 name = "socktop"
-version = "0.1.0"
+version = "0.1.11"
 dependencies = [
  "anyhow",
  "chrono",
  "crossterm 0.27.0",
+ "flate2",
  "futures",
  "futures-util",
  "ratatui",
@@ -1378,23 +1531,28 @@ dependencies = [
  "serde_json",
  "tokio",
  "tokio-tungstenite",
- "tungstenite",
+ "tungstenite 0.27.0",
  "url",
 ]
 
 [[package]]
 name = "socktop_agent"
-version = "0.1.0"
+version = "0.1.11"
 dependencies = [
  "axum",
+ "flate2",
  "futures",
  "futures-util",
+ "gfxinfo",
+ "nvml-wrapper",
+ "once_cell",
  "serde",
  "serde_json",
  "sysinfo",
  "tokio",
  "tracing",
  "tracing-subscriber",
+ "tungstenite 0.27.0",
 ]
 
 [[package]]
@@ -1467,16 +1625,16 @@ dependencies = [
 
 [[package]]
 name = "sysinfo"
-version = "0.36.1"
+version = "0.37.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "252800745060e7b9ffb7b2badbd8b31cfa4aa2e61af879d0a3bf2a317c20217d"
+checksum = "07cec4dc2d2e357ca1e610cfb07de2fa7a10fc3e9fe89f72545f3d244ea87753"
 dependencies = [
  "libc",
  "memchr",
  "ntapi",
  "objc2-core-foundation",
  "objc2-io-kit",
- "windows",
+ "windows 0.61.3",
 ]
 
 [[package]]
@@ -1485,7 +1643,16 @@ version = "1.0.69"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b6aaf5339b578ea85b50e080feb250a3e8ae8cfcdff9a461c9ec2904bc923f52"
 dependencies = [
- "thiserror-impl",
+ "thiserror-impl 1.0.69",
+]
+
+[[package]]
+name = "thiserror"
+version = "2.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "567b8a2dae586314f7be2a752ec7474332959c6460e02bde30d702a66d488708"
+dependencies = [
+ "thiserror-impl 2.0.12",
 ]
 
 [[package]]
@@ -1499,6 +1666,17 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "thiserror-impl"
+version = "2.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f7cf42b4507d8ea322120659672cf1b9dbb93f8f2d4ecfd6e51350ff5b17a1d"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "thread_local"
 version = "1.1.9"
@@ -1558,7 +1736,7 @@ dependencies = [
  "futures-util",
  "log",
  "tokio",
- "tungstenite",
+ "tungstenite 0.24.0",
 ]
 
 [[package]]
@@ -1663,9 +1841,26 @@ dependencies = [
  "http",
  "httparse",
  "log",
- "rand",
+ "rand 0.8.5",
  "sha1",
- "thiserror",
+ "thiserror 1.0.69",
+ "utf-8",
+]
+
+[[package]]
+name = "tungstenite"
+version = "0.27.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eadc29d668c91fcc564941132e17b28a7ceb2f3ebf0b9dae3e03fd7a6748eb0d"
+dependencies = [
+ "bytes",
+ "data-encoding",
+ "http",
+ "httparse",
+ "log",
+ "rand 0.9.2",
+ "sha1",
+ "thiserror 2.0.12",
  "utf-8",
 ]
 
@@ -1745,6 +1940,15 @@ version = "0.11.1+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ccf3ec651a847eb01de73ccad15eb7d99f80485de043efb2f370cd654f4ea44b"
 
+[[package]]
+name = "wasi"
+version = "0.14.2+wasi-0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9683f9a5a998d873c0d21fcbe3c083009670149a8fab228644b8bd36b2c48cb3"
+dependencies = [
+ "wit-bindgen-rt",
+]
+
 [[package]]
 name = "wasm-bindgen"
 version = "0.2.100"
@@ -1825,17 +2029,39 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
+[[package]]
+name = "windows"
+version = "0.60.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ddf874e74c7a99773e62b1c671427abf01a425e77c3d3fb9fb1e4883ea934529"
+dependencies = [
+ "windows-collections 0.1.1",
+ "windows-core 0.60.1",
+ "windows-future 0.1.1",
+ "windows-link",
+ "windows-numerics 0.1.1",
+]
+
 [[package]]
 name = "windows"
 version = "0.61.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9babd3a767a4c1aef6900409f85f5d53ce2544ccdfaa86dad48c91782c6d6893"
 dependencies = [
- "windows-collections",
+ "windows-collections 0.2.0",
- "windows-core",
+ "windows-core 0.61.2",
- "windows-future",
+ "windows-future 0.2.1",
  "windows-link",
- "windows-numerics",
+ "windows-numerics 0.2.0",
+]
+
+[[package]]
+name = "windows-collections"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5467f79cc1ba3f52ebb2ed41dbb459b8e7db636cc3429458d9a852e15bc24dec"
+dependencies = [
+ "windows-core 0.60.1",
 ]
 
 [[package]]
@@ -1844,7 +2070,20 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3beeceb5e5cfd9eb1d76b381630e82c4241ccd0d27f1a39ed41b2760b255c5e8"
 dependencies = [
- "windows-core",
+ "windows-core 0.61.2",
+]
+
+[[package]]
+name = "windows-core"
+version = "0.60.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca21a92a9cae9bf4ccae5cf8368dce0837100ddf6e6d57936749e85f152f6247"
+dependencies = [
+ "windows-implement 0.59.0",
+ "windows-interface",
+ "windows-link",
+ "windows-result",
+ "windows-strings 0.3.1",
 ]
 
 [[package]]
@@ -1853,11 +2092,21 @@ version = "0.61.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c0fdd3ddb90610c7638aa2b3a3ab2904fb9e5cdbecc643ddb3647212781c4ae3"
 dependencies = [
- "windows-implement",
+ "windows-implement 0.60.0",
  "windows-interface",
  "windows-link",
  "windows-result",
- "windows-strings",
+ "windows-strings 0.4.2",
+]
+
+[[package]]
+name = "windows-future"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a787db4595e7eb80239b74ce8babfb1363d8e343ab072f2ffe901400c03349f0"
+dependencies = [
+ "windows-core 0.60.1",
+ "windows-link",
 ]
 
 [[package]]
@@ -1866,11 +2115,22 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fc6a41e98427b19fe4b73c550f060b59fa592d7d686537eebf9385621bfbad8e"
 dependencies = [
- "windows-core",
+ "windows-core 0.61.2",
  "windows-link",
  "windows-threading",
 ]
 
+[[package]]
+name = "windows-implement"
+version = "0.59.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83577b051e2f49a058c308f17f273b570a6a758386fc291b5f6a934dd84e48c1"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "windows-implement"
 version = "0.60.0"
@@ -1899,13 +2159,23 @@ version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e6ad25900d524eaabdbbb96d20b4311e1e7ae1699af4fb28c17ae66c80d798a"
 
+[[package]]
+name = "windows-numerics"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "005dea54e2f6499f2cee279b8f703b3cf3b5734a2d8d21867c8f44003182eeed"
+dependencies = [
+ "windows-core 0.60.1",
+ "windows-link",
+]
+
 [[package]]
 name = "windows-numerics"
 version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9150af68066c4c5c07ddc0ce30421554771e528bde427614c61038bc2c92c2b1"
 dependencies = [
- "windows-core",
+ "windows-core 0.61.2",
  "windows-link",
 ]
 
@@ -1918,6 +2188,15 @@ dependencies = [
  "windows-link",
 ]
 
+[[package]]
+name = "windows-strings"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87fa48cc5d406560701792be122a10132491cff9d0aeb23583cc2dcafc847319"
+dependencies = [
+ "windows-link",
+]
+
 [[package]]
 name = "windows-strings"
 version = "0.4.2"
@@ -2149,6 +2428,42 @@ version = "0.53.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "271414315aff87387382ec3d271b52d7ae78726f5d44ac98b4f4030c91880486"
 
+[[package]]
+name = "wit-bindgen-rt"
+version = "0.39.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6f42320e61fe2cfd34354ecb597f86f413484a798ba44a8ca1165c58d42da6c1"
+dependencies = [
+ "bitflags",
+]
+
+[[package]]
+name = "wmi"
+version = "0.15.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2f902b4592b911109e7352bcfec7b754b07ec71e514d7dfa280eaef924c1cb08"
+dependencies = [
+ "chrono",
+ "futures",
+ "log",
+ "serde",
+ "thiserror 2.0.12",
+ "windows 0.60.0",
+ "windows-core 0.60.1",
+]
+
+[[package]]
+name = "wrapcenum-derive"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a76ff259533532054cfbaefb115c613203c73707017459206380f03b3b3f266e"
+dependencies = [
+ "darling",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "writeable"
 version = "0.6.1"

Cargo.toml

@@ -1,4 +1,5 @@
 [workspace]
+resolver = "2"
 members = [
     "socktop",
     "socktop_agent"

README.md

@@ -1,201 +1,217 @@
 # socktop
 
-**socktop** is a remote system monitor with a rich TUI interface, inspired by `top` and `btop`, that communicates with a lightweight remote agent over WebSockets.
+socktop is a remote system monitor with a rich TUI, inspired by top/btop, talking to a lightweight agent over WebSockets.
 
-It lets you watch CPU, memory, disks, network, temperatures, and processes on another machine in real-time — from the comfort of your terminal.
+- Linux agent: near-zero CPU when idle (request-driven, no always-on sampler)
+- TUI: smooth graphs, sortable process table, scrollbars, readable colors
 
-![socktop screenshot](./docs/socktop-screenshot.png)
+![socktop screenshot](./docs/14900ks_arch_alacritty_gpu_active_v2.jpg)
 
 ---
 
 ## Features
 
-- 📡 **Remote monitoring** via WebSocket — lightweight agent sends JSON metrics
+- Remote monitoring via WebSocket (JSON over WS)
-- 🖥 **Rich TUI** built with [ratatui](https://github.com/ratatui-org/ratatui)
+- TUI built with ratatui
-- 🔍 **Detailed CPU view** — per-core history, current load, and trends
+- CPU
-- 📊 **Memory, Swap, Disk usage** — human-readable units, color-coded
+  - Overall sparkline + per-core mini bars
-- 🌡 **Temperatures** — CPU temperature with visual indicators
+  - Accurate per-process CPU% (Linux /proc deltas), normalized to 0–100%
-- 📈 **Network throughput** — live sparkline graphs with peak tracking
+- Memory/Swap gauges with human units
-- 🏷 **Top processes table** — PID, name, CPU%, memory, and memory%
+- Disks: per-device usage
-- 🎨 Color-coded load, zebra striping for readability
+- Network: per-interface throughput with sparklines and peak markers
-- ⌨ **Keyboard shortcuts**:
+- Temperatures: CPU (optional)
-  - `q` / `Esc` → Quit
+- Top processes (top 50)
+  - PID, name, CPU%, memory, and memory%
+  - Click-to-sort by CPU% or Mem (descending)
+  - Scrollbar and mouse/keyboard scrolling
+  - Total process count shown in the header
+  - Only top-level processes listed (threads hidden) — matches btop/top
+- Optional GPU metrics (can be disabled)
+- Optional auth token for the agent
+
+---
+
+## Prerequisites: Install Rust (rustup)
+
+Rust is fast, safe, and cross‑platform. Installing it will make your machine better. Consider yourself privileged.
+
+Linux/macOS:
+```bash
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+# load cargo for this shell
+source "$HOME/.cargo/env"
+# ensure stable is up to date
+rustup update stable
+rustc --version
+cargo --version
+# after install you may need to reload your shell, e.g.:
+exec bash   # or: exec zsh / exec fish
+```
+
+Windows (for the brave): install from https://rustup.rs with the MSVC toolchain. Yes, you’ll need Visual Studio Build Tools. You chose Windows — enjoy the ride.
+
+### Raspberry Pi / Ubuntu / PopOS (required)
+
+Install GPU support with apt command below
+
+```bash
+sudo apt-get update
+sudo apt-get install libdrm-dev libdrm-amdgpu1
+```
 
 ---
 
 ## Architecture
 
-`socktop` has **two components**:
+Two components:
 
-1. **Agent** (remote side)  
+1) Agent (remote): small Rust WS server using sysinfo + /proc. It collects on demand when the client asks (fast metrics ~500 ms, processes ~2 s, disks ~5 s). No background loop when nobody is connected.
-   A small Rust WebSocket server that runs on the target machine and gathers metrics via [sysinfo](https://crates.io/crates/sysinfo).
 
-2. **Client** (local side)  
+2) Client (local): TUI that connects to ws://HOST:PORT/ws and renders updates.
-   The TUI app (`socktop`) that connects to the agent’s `/ws` endpoint, receives JSON metrics, and renders them.
-
-The two communicate over a persistent WebSocket connection.
 
 ---
 
-## Adaptive (idle-aware) sampling
+## Quick start
 
-The socktop agent now samples system metrics only when at least one WebSocket client is connected. When idle (no clients), the sampler sleeps and CPU usage drops to ~0%.
+- Build both binaries:
 
-How it works
-- The WebSocket handler increments/decrements a client counter in `AppState` on connect/disconnect.
-- A background sampler wakes when the counter transitions from 0 → >0 and sleeps when it returns to 0.
-- The most recent metrics snapshot is cached as JSON for fast responses.
-
-Cold start behavior
-- If a client requests metrics while the cache is empty (e.g., just started or after a long idle), the agent performs a one-off synchronous collection to respond immediately.
-
-Tuning
-- Sampling interval (active): update `spawn_sampler(state, Duration::from_millis(500))` in `socktop_agent/src/main.rs`.
-- Always-on or low-frequency idle sampling: replace the “sleep when idle” logic in `socktop_agent/src/sampler.rs` with a low-frequency interval. Example sketch:
-
-```rust
-// In sampler.rs (sketch): sample every 10s when idle, 500ms when active
-let idle_period = Duration::from_secs(10);
-loop {
-    let active = state.client_count.load(Ordering::Relaxed) > 0;
-    let period = if active { Duration::from_millis(500) } else { idle_period };
-    let mut ticker = tokio::time::interval(period);
-    ticker.tick().await;
-    if !active {
-        // wake early if a client connects
-        tokio::select! {
-            _ = ticker.tick() => {},
-            _ = state.wake_sampler.notified() => continue,
-        }
-    }
-    let m = collect_metrics(&state).await;
-    if let Ok(js) = serde_json::to_string(&m) {
-        *state.last_json.write().await = js;
-    }
-}
-```
-
----
-
-## Installation
-
-### Prerequisites
-- Rust 1.75+ (recommended latest stable)
-- Cargo package manager
-
-### Build from source
 ```bash
-git clone https://github.com/YOURNAME/socktop.git
+git clone https://github.com/jasonwitty/socktop.git
 cd socktop
 cargo build --release
 ```
 
-### Install as a cargo binary
+- Start the agent on the target machine (default port 3000):
+
 ```bash
-cargo install --path .
+./target/release/socktop_agent --port 3000
 ```
-This will install the `socktop` binary into `~/.cargo/bin`.
+
+- Connect with the TUI from your local machine:
+
+```bash
+./target/release/socktop ws://REMOTE_HOST:3000/ws
+```
+
+Tip: Add ?token=... if you enable auth (see Security).
 
 ---
 
-## Running
+## Install (from crates.io)
 
-### 1. Start the agent on the remote machine
+You don’t need to clone this repo to use socktop. Install the published binaries with cargo:
-The agent binary listens on a TCP port and serves `/ws`:
 
 ```bash
-remote_agent 0.0.0.0:8080
+# TUI (client)
+cargo install socktop
+# Agent (server)
+cargo install socktop_agent
 ```
 
-> **Tip:** You can run the agent under `systemd`, inside a Docker container, or just in a tmux/screen session.
+This drops socktop and socktop_agent into ~/.cargo/bin (add it to PATH).
 
-### 2. Connect with the client
+Notes:
-From your local machine:
+- After installing Rust via rustup, reload your shell (e.g., exec bash) so cargo is on PATH.
-```bash
+- Windows: you can also grab prebuilt EXEs from GitHub Actions artifacts if rustup scares you. It shouldn’t. Be brave.
-socktop ws://REMOTE_HOST:8080/ws
-```
 
-Example:
+Option B: System-wide agent (Linux)
 ```bash
-socktop ws://192.168.1.50:8080/ws
+# If you installed with cargo, binaries are in ~/.cargo/bin
+sudo install -o root -g root -m 0755 "$HOME/.cargo/bin/socktop_agent" /usr/local/bin/socktop_agent
+
+# Install and enable the systemd service (example unit in docs/)
+sudo install -o root -g root -m 0644 docs/socktop-agent.service /etc/systemd/system/socktop-agent.service
+sudo systemctl daemon-reload
+sudo systemctl enable --now socktop-agent
 ```
 
 ---
 
 ## Usage
 
-When connected, `socktop` displays:
+Agent (server):
 
-**Left column:**
+```bash
-- **CPU avg graph** — sparkline of recent overall CPU usage
+socktop_agent --port 3000
-- **Memory gauge** — total and used RAM
+# or env: SOCKTOP_PORT=3000 socktop_agent
-- **Swap gauge** — total and used swap
+# optional auth: SOCKTOP_TOKEN=changeme socktop_agent
-- **Disks** — usage per device (only devices with available space > 0)
+```
-- **Network Download/Upload** — sparkline in KB/s, with current & peak values
 
-**Right column:**
+Client (TUI):
-- **Per-core history & trends** — each core’s recent load, current %, and trend arrow
+
-- **Top processes table** — top 20 processes with PID, name, CPU%, memory usage, and memory%
+```bash
+socktop ws://HOST:3000/ws
+# with token:
+socktop "ws://HOST:3000/ws?token=changeme"
+```
+
+Intervals (client-driven):
+- Fast metrics: ~500 ms
+- Processes: ~2 s (top 50)
+- Disks: ~5 s
+
+The agent stays idle unless queried. When queried, it collects just what’s needed.
 
 ---
 
-## Configuring the agent port
+## Updating
 
-The agent listens on TCP port 3000 by default. You can override this via a CLI flag, a positional port argument, or an environment variable:
+Update the agent (systemd):
 
-- CLI flag:
+```bash
-  - socktop_agent --port 8080
+# on the server running the agent
-  - socktop_agent -p 8080
+cargo install socktop_agent --force
-- Positional:
+sudo systemctl stop socktop-agent
-  - socktop_agent 8080
+sudo install -o root -g root -m 0755 "$HOME/.cargo/bin/socktop_agent" /usr/local/bin/socktop_agent
-- Environment variable:
+# if you changed the unit file:
-  - SOCKTOP_PORT=8080 socktop_agent
+# sudo install -o root -g root -m 0644 docs/socktop-agent.service /etc/systemd/system/socktop-agent.service
+# sudo systemctl daemon-reload
+sudo systemctl start socktop-agent
+sudo systemctl status socktop-agent --no-pager
+# logs:
+# journalctl -u socktop-agent -f
+```
 
-Help:
+Update the TUI (client):
-- socktop_agent --help
+```bash
+cargo install socktop --force
+socktop ws://HOST:3000/ws
+```
 
-The TUI should point to ws://HOST:PORT/ws, e.g.:
+Tip: If only the binary changed, restart is enough. If the unit file changed, run sudo systemctl daemon-reload.
-- cargo run -p socktop -- ws://127.0.0.1:8080/ws
 
 ---
 
-## Keyboard Shortcuts
+## Configuration (agent)
 
-| Key         | Action     |
+- Port:
-|-------------|------------|
+  - Flag: --port 8080 or -p 8080
-| `q` or `Esc`| Quit       |
+  - Positional: socktop_agent 8080
+  - Env: SOCKTOP_PORT=8080
+- Auth token (optional): SOCKTOP_TOKEN=changeme
+- Disable GPU metrics: SOCKTOP_AGENT_GPU=0
+- Disable CPU temperature: SOCKTOP_AGENT_TEMP=0
 
 ---
 
-## Security (optional token)
+## Keyboard & Mouse
-By default, the agent exposes metrics over an unauthenticated WebSocket. For untrusted networks, set an auth token and pass it in the client URL:
 
-- Server:
+- Quit: q or Esc
-  - SOCKTOP_TOKEN=changeme socktop_agent --port 3000
+- Processes pane:
-- Client:
+  - Click “CPU %” to sort by CPU descending
-  - socktop ws://HOST:3000/ws?token=changeme
+  - Click “Mem” to sort by memory descending
-
+  - Mouse wheel: scroll
----
+  - Drag scrollbar: scroll
-
+  - Arrow/PageUp/PageDown/Home/End: scroll
-## Platform notes
-- Linux x86_64/AMD/Intel: fully supported.
-- Raspberry Pi:
-  - 64-bit: rustup target add aarch64-unknown-linux-gnu; build on-device for simplicity.
-  - 32-bit: rustup target add armv7-unknown-linux-gnueabihf.
-- Windows:
-  - TUI and agent build/run with stable Rust. Use PowerShell:
-    - cargo run -p socktop_agent -- --port 3000
-    - cargo run -p socktop -- ws://127.0.0.1:3000/ws
-  - CPU temperature may be unavailable; display will show N/A.
 
 ---
 
 ## Example agent JSON
-`socktop` expects the agent to send metrics in this shape:
+
 ```json
 {
   "cpu_total": 12.4,
-  "cpu_per_core": [11.2, 15.7, ...],
+  "cpu_per_core": [11.2, 15.7],
   "mem_total": 33554432,
   "mem_used": 18321408,
   "swap_total": 0,
@@ -207,42 +223,127 @@ By default, the agent exposes metrics over an unauthenticated WebSocket. For unt
   "networks": [{"name":"eth0","received":12345678,"transmitted":87654321}],
   "top_processes": [
     {"pid":1234,"name":"nginx","cpu_usage":1.2,"mem_bytes":12345678}
-  ]
+  ],
+  "gpus": null
 }
 ```
 
+Notes:
+- process_count is merged into the main metrics on the client when processes are polled.
+- top_processes are the current top 50 (sorting in the TUI is client-side).
+
+---
+
+## Security
+
+Set a token on the agent and pass it as a query param from the client:
+
+Server:
+
+```bash
+SOCKTOP_TOKEN=changeme socktop_agent --port 3000
+```
+
+Client:
+
+```bash
+socktop "ws://HOST:3000/ws?token=changeme"
+```
+
+---
+
+## Using tmux to monitor multiple hosts
+
+You can use tmux to show multiple socktop instances in a single terminal.
+
+![socktop screenshot](./docs/tmux_4_rpis_v3.jpg)
+monitoring 4 Raspberry Pis using Tmux
+
+Prerequisites:
+- Install tmux (Ubuntu/Debian: `sudo apt-get install tmux`)
+
+Key bindings (defaults):
+- Split left/right: Ctrl-b %
+- Split top/bottom: Ctrl-b "
+- Move between panes: Ctrl-b + Arrow keys
+- Show pane numbers: Ctrl-b q
+- Close a pane: Ctrl-b x
+- Detach from session: Ctrl-b d
+
+Two panes (left/right)
+- This creates a session named "socktop", splits it horizontally, and starts two socktops.
+
+```bash
+tmux new-session -d -s socktop 'socktop ws://HOST1:3000/ws' \; \
+  split-window -h 'socktop ws://HOST2:3000/ws' \; \
+  select-layout even-horizontal \; \
+  attach
+```
+
+Four panes (top-left, top-right, bottom-left, bottom-right)
+- This creates a 2x2 grid with one socktop per pane.
+
+```bash
+tmux new-session -d -s socktop 'socktop ws://HOST1:3000/ws' \; \
+  split-window -h 'socktop ws://HOST2:3000/ws' \; \
+  select-pane -t 0 \; split-window -v 'socktop ws://HOST3:3000/ws' \; \
+  select-pane -t 1 \; split-window -v 'socktop ws://HOST4:3000/ws' \; \
+  select-layout tiled \; \
+  attach
+```
+
+Tips:
+- Replace HOST1..HOST4 (and ports) with your targets.
+- Reattach later: `tmux attach -t socktop`
+
+---
+
+## Platform notes
+
+- Linux: fully supported (agent and client).
+- Raspberry Pi:
+  - 64-bit: aarch64-unknown-linux-gnu
+  - 32-bit: armv7-unknown-linux-gnueabihf
+- Windows:
+  - TUI + agent can build with stable Rust; bring your own MSVC. You’re on Windows; you know the drill.
+  - CPU temperature may be unavailable.
+  - binary exe for both available in build artifacts under actions.
+- macOS:
+  - TUI works; agent is primarily targeted at Linux. Agent will run just fine on macos for debugging but I have not documented how to run as a service, I may not given the "security" feautures with applications on macos. We will see. 
+
 ---
 
 ## Development
 
-### Run in debug mode:
-```bash
-cargo run -- ws://127.0.0.1:8080/ws
-```
-
-### Code formatting & lint:
 ```bash
 cargo fmt
-cargo clippy
+cargo clippy --all-targets --all-features
+cargo run -p socktop -- ws://127.0.0.1:3000/ws
+cargo run -p socktop_agent -- --port 3000
 ```
 
 ---
 
 ## Roadmap
-- [ ] Configurable refresh interval
+
-- [ ] Filter/sort top processes in the TUI
+- [x] Agent authentication (token)
+- [x] Hide per-thread entries; only show processes
+- [x] Sort top processes in the TUI
+- [ ] Configurable refresh intervals (client)
 - [ ] Export metrics to file
 - [ ] TLS / WSS support
-- [ ] Agent authentication
+- [x] Split processes/disks to separate WS calls with independent cadences (already logical on client; formalize API)
 
 ---
 
 ## License
-MIT License — see [LICENSE](LICENSE).
+
+MIT — see LICENSE.
 
 ---
 
 ## Acknowledgements
-- [`ratatui`](https://github.com/ratatui-org/ratatui) for terminal UI rendering
+
-- [`sysinfo`](https://crates.io/crates/sysinfo) for system metrics
+- ratatui for the TUI
-- [`tokio-tungstenite`](https://crates.io/crates/tokio-tungstenite) for WebSocket client/server
+- sysinfo for system metrics
+- tokio-tungstenite for WebSockets

rust-toolchain.toml

@@ -0,0 +1,3 @@
+[toolchain]
+channel = "stable"
+components = ["clippy", "rustfmt"]

socktop/Cargo.toml

@@ -1,14 +1,14 @@
 [package]
 name = "socktop"
-version = "0.1.0"
+version = "0.1.11"
 authors = ["Jason Witty <jasonpwitty+socktop@proton.me>"]
 description = "Remote system monitor over WebSocket, TUI like top"
 edition = "2021"
+license = "MIT"
 
 [dependencies]
 tokio = { workspace = true }
 tokio-tungstenite = { workspace = true }
-tungstenite = { workspace = true }
 futures = { workspace = true }
 futures-util = { workspace = true }
 serde = { workspace = true }
@@ -18,3 +18,5 @@ ratatui = { workspace = true }
 crossterm = { workspace = true }
 chrono = { workspace = true }
 anyhow = { workspace = true }
+flate2 = { version = "1", default-features = false, features = ["rust_backend"] }
+tungstenite = "0.27.0"

socktop/src/app.rs

@@ -1,23 +1,36 @@
 //! App state and main loop: input handling, fetching metrics, updating history, and drawing.
 
-use std::{collections::VecDeque, io, time::{Duration, Instant}};
+use std::{
+    collections::VecDeque,
+    io,
+    time::{Duration, Instant},
+};
 
 use crossterm::{
-    event::{self, Event, KeyCode},
+    event::{self, DisableMouseCapture, EnableMouseCapture, Event, KeyCode},
     execute,
     terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
 };
 use ratatui::{
     backend::CrosstermBackend,
-    layout::{Constraint, Direction},
+    layout::{Constraint, Direction, Rect},
+    //style::Color, // + add Color
     Terminal,
 };
 use tokio::time::sleep;
 
 use crate::history::{push_capped, PerCoreHistory};
 use crate::types::Metrics;
-use crate::ui::{header::draw_header, cpu::{draw_cpu_avg_graph, draw_per_core_bars}, mem::draw_mem, swap::draw_swap, disks::draw_disks, net::draw_net_spark, processes::draw_top_processes};
+use crate::ui::cpu::{
-use crate::ws::{connect, request_metrics};
+    draw_cpu_avg_graph, draw_per_core_bars, per_core_clamp, per_core_content_area,
+    per_core_handle_key, per_core_handle_mouse, per_core_handle_scrollbar_mouse, PerCoreScrollDrag,
+};
+use crate::ui::processes::{processes_handle_key, processes_handle_mouse, ProcSortBy};
+use crate::ui::{
+    disks::draw_disks, gpu::draw_gpu, header::draw_header, mem::draw_mem, net::draw_net_spark,
+    swap::draw_swap,
+};
+use crate::ws::{connect, request_disks, request_metrics, request_processes};
 
 pub struct App {
     // Latest metrics + histories
@@ -38,6 +51,21 @@ pub struct App {
 
     // Quit flag
     should_quit: bool,
+
+    pub per_core_scroll: usize,
+    pub per_core_drag: Option<PerCoreScrollDrag>, // new: drag state
+    pub procs_scroll_offset: usize,
+    pub procs_drag: Option<PerCoreScrollDrag>,
+    pub procs_sort_by: ProcSortBy,
+    last_procs_area: Option<ratatui::layout::Rect>,
+
+    last_procs_poll: Instant,
+    last_disks_poll: Instant,
+    procs_interval: Duration,
+    disks_interval: Duration,
+
+    // For reconnects
+    ws_url: String,
 }
 
 impl App {
@@ -52,17 +80,33 @@ impl App {
             rx_peak: 0,
             tx_peak: 0,
             should_quit: false,
+            per_core_scroll: 0,
+            per_core_drag: None,
+            procs_scroll_offset: 0,
+            procs_drag: None,
+            procs_sort_by: ProcSortBy::CpuDesc,
+            last_procs_area: None,
+            last_procs_poll: Instant::now()
+                .checked_sub(Duration::from_secs(2))
+                .unwrap_or_else(Instant::now), // trigger immediately on first loop
+            last_disks_poll: Instant::now()
+                .checked_sub(Duration::from_secs(5))
+                .unwrap_or_else(Instant::now),
+            procs_interval: Duration::from_secs(2),
+            disks_interval: Duration::from_secs(5),
+            ws_url: String::new(),
         }
     }
 
     pub async fn run(&mut self, url: &str) -> Result<(), Box<dyn std::error::Error>> {
         // Connect to agent
+        self.ws_url = url.to_string();
         let mut ws = connect(url).await?;
 
         // Terminal setup
         enable_raw_mode()?;
         let mut stdout = io::stdout();
-        execute!(stdout, EnterAlternateScreen)?;
+        execute!(stdout, EnterAlternateScreen, EnableMouseCapture)?;
         let backend = CrosstermBackend::new(stdout);
         let mut terminal = Terminal::new(backend)?;
         terminal.clear()?;
@@ -73,7 +117,7 @@ impl App {
         // Teardown
         disable_raw_mode()?;
         let backend = terminal.backend_mut();
-        execute!(backend, LeaveAlternateScreen)?;
+        execute!(backend, DisableMouseCapture, LeaveAlternateScreen)?;
         terminal.show_cursor()?;
 
         res
@@ -87,23 +131,157 @@ impl App {
         loop {
             // Input (non-blocking)
             while event::poll(Duration::from_millis(10))? {
-                if let Event::Key(k) = event::read()? {
+                match event::read()? {
-                    if matches!(k.code, KeyCode::Char('q') | KeyCode::Char('Q') | KeyCode::Esc) {
+                    Event::Key(k) => {
-                        self.should_quit = true;
+                        if matches!(
+                            k.code,
+                            KeyCode::Char('q') | KeyCode::Char('Q') | KeyCode::Esc
+                        ) {
+                            self.should_quit = true;
+                        }
+                        // Per-core scroll via keys (Up/Down/PageUp/PageDown/Home/End)
+                        let sz = terminal.size()?;
+                        let area = Rect::new(0, 0, sz.width, sz.height);
+                        let rows = ratatui::layout::Layout::default()
+                            .direction(Direction::Vertical)
+                            .constraints([
+                                Constraint::Length(1),
+                                Constraint::Ratio(1, 3),
+                                Constraint::Length(3),
+                                Constraint::Length(3),
+                                Constraint::Min(10),
+                            ])
+                            .split(area);
+                        let top = ratatui::layout::Layout::default()
+                            .direction(Direction::Horizontal)
+                            .constraints([Constraint::Percentage(66), Constraint::Percentage(34)])
+                            .split(rows[1]);
+                        let content = per_core_content_area(top[1]);
+
+                        per_core_handle_key(&mut self.per_core_scroll, k, content.height as usize);
+
+                        let total_rows = self
+                            .last_metrics
+                            .as_ref()
+                            .map(|mm| mm.cpu_per_core.len())
+                            .unwrap_or(0);
+                        per_core_clamp(
+                            &mut self.per_core_scroll,
+                            total_rows,
+                            content.height as usize,
+                        );
+
+                        if let Some(p_area) = self.last_procs_area {
+                            // page size = visible rows (inner height minus header = 1)
+                            let page = p_area.height.saturating_sub(3).max(1) as usize; // borders (2) + header (1)
+                            processes_handle_key(&mut self.procs_scroll_offset, k, page);
+                        }
                     }
+                    Event::Mouse(m) => {
+                        // Layout to get areas
+                        let sz = terminal.size()?;
+                        let area = Rect::new(0, 0, sz.width, sz.height);
+                        let rows = ratatui::layout::Layout::default()
+                            .direction(Direction::Vertical)
+                            .constraints([
+                                Constraint::Length(1),
+                                Constraint::Ratio(1, 3),
+                                Constraint::Length(3),
+                                Constraint::Length(3),
+                                Constraint::Min(10),
+                            ])
+                            .split(area);
+                        let top = ratatui::layout::Layout::default()
+                            .direction(Direction::Horizontal)
+                            .constraints([Constraint::Percentage(66), Constraint::Percentage(34)])
+                            .split(rows[1]);
+
+                        // Content wheel scrolling
+                        let content = per_core_content_area(top[1]);
+                        per_core_handle_mouse(
+                            &mut self.per_core_scroll,
+                            m,
+                            content,
+                            content.height as usize,
+                        );
+
+                        // Scrollbar clicks/drag
+                        let total_rows = self
+                            .last_metrics
+                            .as_ref()
+                            .map(|mm| mm.cpu_per_core.len())
+                            .unwrap_or(0);
+                        per_core_handle_scrollbar_mouse(
+                            &mut self.per_core_scroll,
+                            &mut self.per_core_drag,
+                            m,
+                            top[1],
+                            total_rows,
+                        );
+
+                        // Clamp to bounds
+                        per_core_clamp(
+                            &mut self.per_core_scroll,
+                            total_rows,
+                            content.height as usize,
+                        );
+
+                        // Processes table: sort by column on header click
+                        if let (Some(mm), Some(p_area)) =
+                            (self.last_metrics.as_ref(), self.last_procs_area)
+                        {
+                            if let Some(new_sort) = processes_handle_mouse(
+                                &mut self.procs_scroll_offset,
+                                &mut self.procs_drag,
+                                m,
+                                p_area,
+                                mm.top_processes.len(),
+                            ) {
+                                self.procs_sort_by = new_sort;
+                            }
+                        }
+                    }
+                    Event::Resize(_, _) => {}
+                    _ => {}
                 }
             }
             if self.should_quit {
                 break;
             }
 
-            // Fetch and update
+            // Draw current frame first so the UI never feels blocked
+            terminal.draw(|f| self.draw(f))?;
+
+            // Then fetch and update
             if let Some(m) = request_metrics(ws).await {
                 self.update_with_metrics(m);
-            }
 
-            // Draw
+                // Only poll processes every 2s
-            terminal.draw(|f| self.draw(f))?;
+                if self.last_procs_poll.elapsed() >= self.procs_interval {
+                    if let Some(procs) = request_processes(ws).await {
+                        if let Some(mm) = self.last_metrics.as_mut() {
+                            mm.top_processes = procs.top_processes;
+                            mm.process_count = Some(procs.process_count);
+                        }
+                    }
+                    self.last_procs_poll = Instant::now();
+                }
+
+                // Only poll disks every 5s
+                if self.last_disks_poll.elapsed() >= self.disks_interval {
+                    if let Some(disks) = request_disks(ws).await {
+                        if let Some(mm) = self.last_metrics.as_mut() {
+                            mm.disks = disks;
+                        }
+                    }
+                    self.last_disks_poll = Instant::now();
+                }
+            } else {
+                // If we couldn't get metrics, try to reconnect once
+                if let Ok(new_ws) = connect(&self.ws_url).await {
+                    *ws = new_ws;
+                }
+            }
 
             // Tick rate
             sleep(Duration::from_millis(500)).await;
@@ -112,7 +290,21 @@ impl App {
         Ok(())
     }
 
-    fn update_with_metrics(&mut self, m: Metrics) {
+    fn update_with_metrics(&mut self, mut m: Metrics) {
+        if let Some(prev) = &self.last_metrics {
+            // Preserve slower fields when the fast payload omits them
+            if m.disks.is_empty() {
+                m.disks = prev.disks.clone();
+            }
+            if m.top_processes.is_empty() {
+                m.top_processes = prev.top_processes.clone();
+            }
+            // Preserve total processes count across fast updates
+            if m.process_count.is_none() {
+                m.process_count = prev.process_count;
+            }
+        }
+
         // CPU avg history
         let v = m.cpu_total.clamp(0.0, 100.0).round() as u64;
         push_capped(&mut self.cpu_hist, v, 600);
@@ -130,69 +322,156 @@ impl App {
             let rx = ((rx_total.saturating_sub(prx)) as f64 / dt / 1024.0).round() as u64;
             let tx = ((tx_total.saturating_sub(ptx)) as f64 / dt / 1024.0).round() as u64;
             (rx, tx)
-        } else { (0, 0) };
+        } else {
+            (0, 0)
+        };
         self.last_net_totals = Some((rx_total, tx_total, now));
         push_capped(&mut self.rx_hist, rx_kb, 600);
         push_capped(&mut self.tx_hist, tx_kb, 600);
         self.rx_peak = self.rx_peak.max(rx_kb);
         self.tx_peak = self.tx_peak.max(tx_kb);
 
+        // Store merged snapshot
         self.last_metrics = Some(m);
     }
 
-    fn draw(&mut self, f: &mut ratatui::Frame<'_>) {
+    pub fn draw(&mut self, f: &mut ratatui::Frame<'_>) {
         let area = f.area();
 
+        // Root rows: header, top (cpu avg + per-core), memory, swap, bottom
         let rows = ratatui::layout::Layout::default()
             .direction(Direction::Vertical)
             .constraints([
-                Constraint::Length(1),
+                Constraint::Length(1),   // header
-                Constraint::Ratio(1, 3),
+                Constraint::Ratio(1, 3), // top row
-                Constraint::Length(3),
+                Constraint::Length(3),   // memory (left) + GPU (right, part 1)
-                Constraint::Length(3),
+                Constraint::Length(3),   // swap (left)   + GPU (right, part 2)
-                Constraint::Min(10),
+                Constraint::Min(10),     // bottom: disks + net (left), top procs (right)
             ])
             .split(area);
 
+        // Header
         draw_header(f, rows[0], self.last_metrics.as_ref());
 
-        let top = ratatui::layout::Layout::default()
+        // Top row: left CPU avg, right Per-core (full top-right)
+        let top_lr = ratatui::layout::Layout::default()
             .direction(Direction::Horizontal)
             .constraints([Constraint::Percentage(66), Constraint::Percentage(34)])
             .split(rows[1]);
 
-        draw_cpu_avg_graph(f, top[0], &self.cpu_hist, self.last_metrics.as_ref());
+        draw_cpu_avg_graph(f, top_lr[0], &self.cpu_hist, self.last_metrics.as_ref());
-        draw_per_core_bars(f, top[1], self.last_metrics.as_ref(), &self.per_core_hist);
+        draw_per_core_bars(
+            f,
+            top_lr[1],
+            self.last_metrics.as_ref(),
+            &self.per_core_hist,
+            self.per_core_scroll,
+        );
 
-        draw_mem(f, rows[2], self.last_metrics.as_ref());
+        // Memory + Swap rows split into left/right columns
-        draw_swap(f, rows[3], self.last_metrics.as_ref());
+        let mem_lr = ratatui::layout::Layout::default()
-
-        let bottom = ratatui::layout::Layout::default()
             .direction(Direction::Horizontal)
             .constraints([Constraint::Percentage(66), Constraint::Percentage(34)])
+            .split(rows[2]);
+        let swap_lr = ratatui::layout::Layout::default()
+            .direction(Direction::Horizontal)
+            .constraints([Constraint::Percentage(66), Constraint::Percentage(34)])
+            .split(rows[3]);
+
+        // Left: Memory + Swap
+        draw_mem(f, mem_lr[0], self.last_metrics.as_ref());
+        draw_swap(f, swap_lr[0], self.last_metrics.as_ref());
+
+        // Right: GPU spans the same vertical space as Memory + Swap
+        let gpu_area = ratatui::layout::Rect {
+            x: mem_lr[1].x,
+            y: mem_lr[1].y,
+            width: mem_lr[1].width,
+            height: mem_lr[1].height + swap_lr[1].height,
+        };
+        draw_gpu(f, gpu_area, self.last_metrics.as_ref());
+
+        // Bottom area: left = Disks + Network, right = Top Processes
+        let bottom_lr = ratatui::layout::Layout::default()
+            .direction(Direction::Horizontal)
+            .constraints([Constraint::Percentage(60), Constraint::Percentage(40)])
             .split(rows[4]);
 
+        // Left bottom: Disks + Net stacked (make net panes slightly taller)
         let left_stack = ratatui::layout::Layout::default()
             .direction(Direction::Vertical)
-            .constraints([Constraint::Min(6), Constraint::Length(4), Constraint::Length(4)])
+            .constraints([
-            .split(bottom[0]);
+                Constraint::Min(4),    // Disks shrink slightly
+                Constraint::Length(5), // Download taller
+                Constraint::Length(5), // Upload taller
+            ])
+            .split(bottom_lr[0]);
 
         draw_disks(f, left_stack[0], self.last_metrics.as_ref());
         draw_net_spark(
             f,
             left_stack[1],
-            &format!("Download (KB/s) — now: {} | peak: {}", self.rx_hist.back().copied().unwrap_or(0), self.rx_peak),
+            &format!(
+                "Download (KB/s) — now: {} | peak: {}",
+                self.rx_hist.back().copied().unwrap_or(0),
+                self.rx_peak
+            ),
             &self.rx_hist,
             ratatui::style::Color::Green,
         );
         draw_net_spark(
             f,
             left_stack[2],
-            &format!("Upload (KB/s) — now: {} | peak: {}", self.tx_hist.back().copied().unwrap_or(0), self.tx_peak),
+            &format!(
+                "Upload (KB/s) — now: {} | peak: {}",
+                self.tx_hist.back().copied().unwrap_or(0),
+                self.tx_peak
+            ),
             &self.tx_hist,
             ratatui::style::Color::Blue,
         );
 
-        draw_top_processes(f, bottom[1], self.last_metrics.as_ref());
+        // Right bottom: Top Processes fills the column
+        let procs_area = bottom_lr[1];
+        // Cache for input handlers
+        self.last_procs_area = Some(procs_area);
+        crate::ui::processes::draw_top_processes(
+            f,
+            procs_area,
+            self.last_metrics.as_ref(),
+            self.procs_scroll_offset,
+            self.procs_sort_by,
+        );
     }
-}
+}
+
+impl Default for App {
+    fn default() -> Self {
+        Self {
+            last_metrics: None,
+            cpu_hist: VecDeque::with_capacity(600),
+            per_core_hist: PerCoreHistory::new(60),
+            last_net_totals: None,
+            rx_hist: VecDeque::with_capacity(600),
+            tx_hist: VecDeque::with_capacity(600),
+            rx_peak: 0,
+            tx_peak: 0,
+            should_quit: false,
+            per_core_scroll: 0,
+            per_core_drag: None,
+            procs_scroll_offset: 0,
+            procs_drag: None,
+            procs_sort_by: ProcSortBy::CpuDesc,
+            last_procs_area: None,
+            last_procs_poll: Instant::now()
+                .checked_sub(Duration::from_secs(2))
+                .unwrap_or_else(Instant::now), // trigger immediately on first loop
+            last_disks_poll: Instant::now()
+                .checked_sub(Duration::from_secs(5))
+                .unwrap_or_else(Instant::now),
+            procs_interval: Duration::from_secs(2),
+            disks_interval: Duration::from_secs(5),
+            ws_url: String::new(),
+        }
+    }
+}

socktop/src/history.rs

@@ -17,7 +17,10 @@ pub struct PerCoreHistory {
 
 impl PerCoreHistory {
     pub fn new(cap: usize) -> Self {
-        Self { deques: Vec::new(), cap }
+        Self {
+            deques: Vec::new(),
+            cap,
+        }
     }
 
     // Ensure we have one deque per core; resize on CPU topology changes
@@ -36,4 +39,4 @@ impl PerCoreHistory {
             push_capped(&mut self.deques[i], val, self.cap);
         }
     }
-}
+}

socktop/src/lib.rs

@@ -0,0 +1,4 @@
+//! Library surface for integration tests and reuse.
+
+pub mod types;
+pub mod ws;

socktop/src/main.rs

@@ -6,18 +6,25 @@ mod types;
 mod ui;
 mod ws;
 
-use std::env;
 use app::App;
+use std::env;
 
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
-    let args: Vec<String> = env::args().collect();
+    let mut args = env::args();
-    if args.len() < 2 {
+    let prog = args.next().unwrap_or_else(|| "socktop".into());
-        eprintln!("Usage: {} ws://HOST:PORT/ws", args[0]);
+    let url = match args.next() {
-        std::process::exit(1);
+        Some(flag) if flag == "-h" || flag == "--help" => {
-    }
+            println!("Usage: {prog} ws://HOST:PORT/ws");
-    let url = args[1].clone();
+            return Ok(());
+        }
+        Some(url) => url,
+        None => {
+            eprintln!("Usage: {prog} ws://HOST:PORT/ws");
+            std::process::exit(1);
+        }
+    };
 
     let mut app = App::new();
     app.run(&url).await
-}
+}

socktop/src/types.rs

@@ -2,21 +2,7 @@
 
 use serde::Deserialize;
 
-#[derive(Debug, Deserialize, Clone)]
+#[derive(Debug, Clone, Deserialize)]
-pub struct Disk {
-    pub name: String,
-    pub total: u64,
-    pub available: u64,
-}
-
-#[derive(Debug, Deserialize, Clone)]
-pub struct Network {
-    // cumulative totals; client diffs to compute rates
-    pub received: u64,
-    pub transmitted: u64,
-}
-
-#[derive(Debug, Deserialize, Clone)]
 pub struct ProcessInfo {
     pub pid: u32,
     pub name: String,
@@ -24,7 +10,48 @@ pub struct ProcessInfo {
     pub mem_bytes: u64,
 }
 
-#[derive(Debug, Deserialize, Clone)]
+#[derive(Debug, Clone, Deserialize)]
+pub struct DiskInfo {
+    pub name: String,
+    pub total: u64,
+    pub available: u64,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct NetworkInfo {
+    #[allow(dead_code)]
+    pub name: String,
+    pub received: u64,
+    pub transmitted: u64,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct GpuInfo {
+    pub name: Option<String>,
+    #[allow(dead_code)]
+    pub vendor: Option<String>,
+
+    // Accept both the new and legacy keys
+    #[serde(
+        default,
+        alias = "utilization_gpu_pct",
+        alias = "gpu_util_pct",
+        alias = "gpu_utilization"
+    )]
+    pub utilization: Option<f32>,
+
+    #[serde(default, alias = "mem_used_bytes", alias = "vram_used_bytes")]
+    pub mem_used: Option<u64>,
+
+    #[serde(default, alias = "mem_total_bytes", alias = "vram_total_bytes")]
+    pub mem_total: Option<u64>,
+
+    #[allow(dead_code)]
+    #[serde(default, alias = "temp_c", alias = "temperature_c")]
+    pub temperature: Option<f32>,
+}
+
+#[derive(Debug, Clone, Deserialize)]
 pub struct Metrics {
     pub cpu_total: f32,
     pub cpu_per_core: Vec<f32>,
@@ -32,10 +59,20 @@ pub struct Metrics {
     pub mem_used: u64,
     pub swap_total: u64,
     pub swap_used: u64,
-    pub process_count: usize,
     pub hostname: String,
     pub cpu_temp_c: Option<f32>,
-    pub disks: Vec<Disk>,
+    pub disks: Vec<DiskInfo>,
-    pub networks: Vec<Network>,
+    pub networks: Vec<NetworkInfo>,
     pub top_processes: Vec<ProcessInfo>,
-}
+    pub gpus: Option<Vec<GpuInfo>>,
+    // New: keep the last reported total process count
+    #[serde(default)]
+    pub process_count: Option<usize>,
+}
+
+#[allow(dead_code)]
+#[derive(Debug, Clone, Deserialize)]
+pub struct ProcessesPayload {
+    pub process_count: usize,
+    pub top_processes: Vec<ProcessInfo>,
+}

socktop/src/ui/cpu.rs

@@ -1,23 +1,250 @@
 //! CPU average sparkline + per-core mini bars.
 
+use crate::ui::theme::{SB_ARROW, SB_THUMB, SB_TRACK};
+use crossterm::event::{KeyCode, KeyEvent, MouseButton, MouseEvent, MouseEventKind};
+use ratatui::style::Modifier;
+use ratatui::style::{Color, Style};
 use ratatui::{
     layout::{Constraint, Direction, Layout, Rect},
-    style::{Color, Style},
     text::{Line, Span},
     widgets::{Block, Borders, Paragraph, Sparkline},
 };
-use ratatui::style::Modifier;
 
 use crate::history::PerCoreHistory;
 use crate::types::Metrics;
 
+/// State for dragging the scrollbar thumb
+#[derive(Clone, Copy, Debug, Default)]
+pub struct PerCoreScrollDrag {
+    pub active: bool,
+    pub start_y: u16,     // mouse row where drag started
+    pub start_top: usize, // thumb top (in track rows) at drag start
+}
+
+/// Returns the content area for per-core CPU bars, excluding borders and reserving space for scrollbar.
+pub fn per_core_content_area(area: Rect) -> Rect {
+    // Inner minus borders
+    let inner = Rect {
+        x: area.x + 1,
+        y: area.y + 1,
+        width: area.width.saturating_sub(2),
+        height: area.height.saturating_sub(2),
+    };
+    // Reserve 1 column on the right for a gutter and 1 for the scrollbar
+    Rect {
+        x: inner.x,
+        y: inner.y,
+        width: inner.width.saturating_sub(2),
+        height: inner.height,
+    }
+}
+
+/// Handles key events for per-core CPU bars.
+pub fn per_core_handle_key(scroll_offset: &mut usize, key: KeyEvent, page_size: usize) {
+    match key.code {
+        KeyCode::Up => *scroll_offset = scroll_offset.saturating_sub(1),
+        KeyCode::Down => *scroll_offset = scroll_offset.saturating_add(1),
+        KeyCode::PageUp => {
+            let step = page_size.max(1);
+            *scroll_offset = scroll_offset.saturating_sub(step);
+        }
+        KeyCode::PageDown => {
+            let step = page_size.max(1);
+            *scroll_offset = scroll_offset.saturating_add(step);
+        }
+        KeyCode::Home => *scroll_offset = 0,
+        KeyCode::End => *scroll_offset = usize::MAX, // draw() clamps to max
+        _ => {}
+    }
+}
+
+/// Handles mouse wheel over the content.
+pub fn per_core_handle_mouse(
+    scroll_offset: &mut usize,
+    mouse: MouseEvent,
+    content_area: Rect,
+    page_size: usize,
+) {
+    let inside = mouse.column >= content_area.x
+        && mouse.column < content_area.x + content_area.width
+        && mouse.row >= content_area.y
+        && mouse.row < content_area.y + content_area.height;
+
+    if !inside {
+        return;
+    }
+
+    match mouse.kind {
+        MouseEventKind::ScrollUp => *scroll_offset = scroll_offset.saturating_sub(1),
+        MouseEventKind::ScrollDown => *scroll_offset = scroll_offset.saturating_add(1),
+        // Optional paging via horizontal wheel
+        MouseEventKind::ScrollLeft => {
+            let step = page_size.max(1);
+            *scroll_offset = scroll_offset.saturating_sub(step);
+        }
+        MouseEventKind::ScrollRight => {
+            let step = page_size.max(1);
+            *scroll_offset = scroll_offset.saturating_add(step);
+        }
+        _ => {}
+    }
+}
+
+/// Handles mouse interaction with the scrollbar itself (click arrows/page/drag).
+pub fn per_core_handle_scrollbar_mouse(
+    scroll_offset: &mut usize,
+    drag: &mut Option<PerCoreScrollDrag>,
+    mouse: MouseEvent,
+    per_core_area: Rect,
+    total_rows: usize,
+) {
+    // Geometry
+    let inner = Rect {
+        x: per_core_area.x + 1,
+        y: per_core_area.y + 1,
+        width: per_core_area.width.saturating_sub(2),
+        height: per_core_area.height.saturating_sub(2),
+    };
+    if inner.height < 3 || inner.width < 1 {
+        return;
+    }
+    let content = Rect {
+        x: inner.x,
+        y: inner.y,
+        width: inner.width.saturating_sub(2),
+        height: inner.height,
+    };
+    let scroll_area = Rect {
+        x: inner.x + inner.width.saturating_sub(1),
+        y: inner.y,
+        width: 1,
+        height: inner.height,
+    };
+    let viewport_rows = content.height as usize;
+    let total = total_rows.max(1);
+    let view = viewport_rows.clamp(1, total);
+    let max_off = total.saturating_sub(view);
+    let mut offset = (*scroll_offset).min(max_off);
+
+    // Track and current thumb
+    let track = (scroll_area.height - 2) as usize;
+    if track == 0 {
+        return;
+    }
+    let thumb_len = (track * view).div_ceil(total).max(1).min(track);
+    let top_for_offset = |off: usize| -> usize {
+        if max_off == 0 {
+            0
+        } else {
+            ((track - thumb_len) * off + max_off / 2) / max_off
+        }
+    };
+    let thumb_top = top_for_offset(offset);
+
+    let inside_scrollbar = mouse.column == scroll_area.x
+        && mouse.row >= scroll_area.y
+        && mouse.row < scroll_area.y + scroll_area.height;
+
+    // Helper to page
+    let page_up = || offset.saturating_sub(view.max(1));
+    let page_down = || offset.saturating_add(view.max(1));
+
+    match mouse.kind {
+        MouseEventKind::Down(MouseButton::Left) if inside_scrollbar => {
+            // Where within the track?
+            let row = mouse.row;
+            if row == scroll_area.y {
+                // Top arrow
+                offset = offset.saturating_sub(1);
+            } else if row + 1 == scroll_area.y + scroll_area.height {
+                // Bottom arrow
+                offset = offset.saturating_add(1);
+            } else {
+                // Inside track
+                let rel = (row - (scroll_area.y + 1)) as usize;
+                let thumb_end = thumb_top + thumb_len;
+                if rel < thumb_top {
+                    // Page up
+                    offset = page_up();
+                } else if rel >= thumb_end {
+                    // Page down
+                    offset = page_down();
+                } else {
+                    // Start dragging
+                    *drag = Some(PerCoreScrollDrag {
+                        active: true,
+                        start_y: row,
+                        start_top: thumb_top,
+                    });
+                }
+            }
+        }
+        MouseEventKind::Drag(MouseButton::Left) => {
+            if let Some(mut d) = drag.take() {
+                if d.active {
+                    let dy = (mouse.row as i32) - (d.start_y as i32);
+                    let new_top = (d.start_top as i32 + dy)
+                        .clamp(0, (track.saturating_sub(thumb_len)) as i32)
+                        as usize;
+                    // Inverse mapping top -> offset
+                    if track > thumb_len {
+                        let denom = track - thumb_len;
+                        offset = if max_off == 0 {
+                            0
+                        } else {
+                            (new_top * max_off + denom / 2) / denom
+                        };
+                    } else {
+                        offset = 0;
+                    }
+                    // Keep dragging
+                    d.start_top = new_top;
+                    d.start_y = mouse.row;
+                    *drag = Some(d);
+                }
+            }
+        }
+        MouseEventKind::Up(MouseButton::Left) => {
+            // End drag
+            *drag = None;
+        }
+        // Also allow wheel scrolling when cursor is over the scrollbar
+        MouseEventKind::ScrollUp if inside_scrollbar => {
+            offset = offset.saturating_sub(1);
+        }
+        MouseEventKind::ScrollDown if inside_scrollbar => {
+            offset = offset.saturating_add(1);
+        }
+        _ => {}
+    }
+
+    // Clamp and write back
+    if offset > max_off {
+        offset = max_off;
+    }
+    *scroll_offset = offset;
+}
+
+/// Clamp scroll offset to the valid range given content and viewport.
+pub fn per_core_clamp(scroll_offset: &mut usize, total_rows: usize, viewport_rows: usize) {
+    let max_offset = total_rows.saturating_sub(viewport_rows);
+    if *scroll_offset > max_offset {
+        *scroll_offset = max_offset;
+    }
+}
+
+/// Draws the CPU average sparkline graph.
 pub fn draw_cpu_avg_graph(
     f: &mut ratatui::Frame<'_>,
     area: Rect,
     hist: &std::collections::VecDeque<u64>,
     m: Option<&Metrics>,
 ) {
-    let title = if let Some(mm) = m { format!("CPU avg (now: {:>5.1}%)", mm.cpu_total) } else { "CPU avg".into() };
+    let title = if let Some(mm) = m {
+        format!("CPU avg (now: {:>5.1}%)", mm.cpu_total)
+    } else {
+        "CPU avg".into()
+    };
     let max_points = area.width.saturating_sub(2) as usize;
     let start = hist.len().saturating_sub(max_points);
     let data: Vec<u64> = hist.iter().skip(start).cloned().collect();
@@ -29,38 +256,74 @@ pub fn draw_cpu_avg_graph(
     f.render_widget(spark, area);
 }
 
+/// Draws the per-core CPU bars with sparklines and trends.
 pub fn draw_per_core_bars(
     f: &mut ratatui::Frame<'_>,
     area: Rect,
     m: Option<&Metrics>,
     per_core_hist: &PerCoreHistory,
+    scroll_offset: usize,
 ) {
-    f.render_widget(Block::default().borders(Borders::ALL).title("Per-core"), area);
+    f.render_widget(
-    let Some(mm) = m else { return; };
+        Block::default().borders(Borders::ALL).title("Per-core"),
+        area,
+    );
+    let Some(mm) = m else {
+        return;
+    };
 
-    let inner = Rect { x: area.x + 1, y: area.y + 1, width: area.width.saturating_sub(2), height: area.height.saturating_sub(2) };
+    // Compute inner rect and content area
-    if inner.height == 0 { return; }
+    let inner = Rect {
+        x: area.x + 1,
+        y: area.y + 1,
+        width: area.width.saturating_sub(2),
+        height: area.height.saturating_sub(2),
+    };
+    if inner.height == 0 || inner.width <= 2 {
+        return;
+    }
+    let content = Rect {
+        x: inner.x,
+        y: inner.y,
+        width: inner.width.saturating_sub(2),
+        height: inner.height,
+    };
+
+    let total_rows = mm.cpu_per_core.len();
+    let viewport_rows = content.height as usize;
+    let max_offset = total_rows.saturating_sub(viewport_rows);
+    let offset = scroll_offset.min(max_offset);
+    let show_n = total_rows.saturating_sub(offset).min(viewport_rows);
 
-    let rows = inner.height as usize;
-    let show_n = rows.min(mm.cpu_per_core.len());
     let constraints: Vec<Constraint> = (0..show_n).map(|_| Constraint::Length(1)).collect();
-    let vchunks = Layout::default().direction(Direction::Vertical).constraints(constraints).split(inner);
+    let vchunks = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints(constraints)
+        .split(content);
 
     for i in 0..show_n {
+        let idx = offset + i;
         let rect = vchunks[i];
         let hchunks = Layout::default()
             .direction(Direction::Horizontal)
             .constraints([Constraint::Min(6), Constraint::Length(12)])
             .split(rect);
 
-        let curr = mm.cpu_per_core[i].clamp(0.0, 100.0);
+        let curr = mm.cpu_per_core[idx].clamp(0.0, 100.0);
-        let older = per_core_hist.deques.get(i)
+        let older = per_core_hist
+            .deques
+            .get(idx)
             .and_then(|d| d.iter().rev().nth(20).copied())
             .map(|v| v as f32)
             .unwrap_or(curr);
-        let trend = if curr > older + 0.2 { "↑" }
+
-                    else if curr + 0.2 < older { "↓" }
+        let trend = if curr > older + 0.2 {
-                    else { "╌" };
+            "↑"
+        } else if curr + 0.2 < older {
+            "↓"
+        } else {
+            "╌"
+        };
 
         let fg = match curr {
             x if x < 25.0 => Color::Green,
@@ -70,7 +333,7 @@ pub fn draw_per_core_bars(
 
         let hist: Vec<u64> = per_core_hist
             .deques
-            .get(i)
+            .get(idx)
             .map(|d| {
                 let max_points = hchunks[0].width as usize;
                 let start = d.len().saturating_sub(max_points);
@@ -82,10 +345,49 @@ pub fn draw_per_core_bars(
             .data(&hist)
             .max(100)
             .style(Style::default().fg(fg));
+
         f.render_widget(spark, hchunks[0]);
 
-        let label = format!("cpu{:<2}{}{:>5.1}%", i, trend, curr);
+        let label = format!("cpu{idx:<2}{trend}{curr:>5.1}%");
-        let line = Line::from(Span::styled(label, Style::default().fg(fg).add_modifier(Modifier::BOLD)));
+        let line = Line::from(Span::styled(
+            label,
+            Style::default().fg(fg).add_modifier(Modifier::BOLD),
+        ));
         f.render_widget(Paragraph::new(line).right_aligned(), hchunks[1]);
     }
-}
+
+    // Custom 1-col scrollbar with arrows, track, and exact mapping
+    let scroll_area = Rect {
+        x: inner.x + inner.width.saturating_sub(1),
+        y: inner.y,
+        width: 1,
+        height: inner.height,
+    };
+    if scroll_area.height >= 3 {
+        let track = (scroll_area.height - 2) as usize;
+        let total = total_rows.max(1);
+        let view = viewport_rows.clamp(1, total);
+        let max_off = total.saturating_sub(view);
+
+        let thumb_len = (track * view).div_ceil(total).max(1).min(track);
+        let thumb_top = if max_off == 0 {
+            0
+        } else {
+            ((track - thumb_len) * offset + max_off / 2) / max_off
+        };
+
+        // Build lines: top arrow, track (with thumb), bottom arrow
+        let mut lines: Vec<Line> = Vec::with_capacity(scroll_area.height as usize);
+        lines.push(Line::from(Span::styled("▲", Style::default().fg(SB_ARROW))));
+        for i in 0..track {
+            if i >= thumb_top && i < thumb_top + thumb_len {
+                lines.push(Line::from(Span::styled("█", Style::default().fg(SB_THUMB))));
+            } else {
+                lines.push(Line::from(Span::styled("│", Style::default().fg(SB_TRACK))));
+            }
+        }
+        lines.push(Line::from(Span::styled("▼", Style::default().fg(SB_ARROW))));
+
+        f.render_widget(Paragraph::new(lines), scroll_area);
+    }
+}

socktop/src/ui/disks.rs

@@ -1,16 +1,18 @@
 //! Disk cards with per-device gauge and title line.
 
+use crate::types::Metrics;
+use crate::ui::util::{disk_icon, human, truncate_middle};
 use ratatui::{
     layout::{Constraint, Direction, Layout, Rect},
     style::Style,
     widgets::{Block, Borders, Gauge},
 };
-use crate::types::Metrics;
-use crate::ui::util::{human, truncate_middle, disk_icon};
 
 pub fn draw_disks(f: &mut ratatui::Frame<'_>, area: Rect, m: Option<&Metrics>) {
     f.render_widget(Block::default().borders(Borders::ALL).title("Disks"), area);
-    let Some(mm) = m else { return; };
+    let Some(mm) = m else {
+        return;
+    };
 
     let inner = Rect {
         x: area.x + 1,
@@ -18,12 +20,16 @@ pub fn draw_disks(f: &mut ratatui::Frame<'_>, area: Rect, m: Option<&Metrics>) {
         width: area.width.saturating_sub(2),
         height: area.height.saturating_sub(2),
     };
-    if inner.height < 3 { return; }
+    if inner.height < 3 {
+        return;
+    }
 
     let per_disk_h = 3u16;
     let max_cards = (inner.height / per_disk_h).min(mm.disks.len() as u16) as usize;
 
-    let constraints: Vec<Constraint> = (0..max_cards).map(|_| Constraint::Length(per_disk_h)).collect();
+    let constraints: Vec<Constraint> = (0..max_cards)
+        .map(|_| Constraint::Length(per_disk_h))
+        .collect();
     let rows = Layout::default()
         .direction(Direction::Vertical)
         .constraints(constraints)
@@ -32,10 +38,20 @@ pub fn draw_disks(f: &mut ratatui::Frame<'_>, area: Rect, m: Option<&Metrics>) {
     for (i, slot) in rows.iter().enumerate() {
         let d = &mm.disks[i];
         let used = d.total.saturating_sub(d.available);
-        let ratio = if d.total > 0 { used as f64 / d.total as f64 } else { 0.0 };
+        let ratio = if d.total > 0 {
+            used as f64 / d.total as f64
+        } else {
+            0.0
+        };
         let pct = (ratio * 100.0).round() as u16;
 
-        let color = if pct < 70 { ratatui::style::Color::Green } else if pct < 90 { ratatui::style::Color::Yellow } else { ratatui::style::Color::Red };
+        let color = if pct < 70 {
+            ratatui::style::Color::Green
+        } else if pct < 90 {
+            ratatui::style::Color::Yellow
+        } else {
+            ratatui::style::Color::Red
+        };
 
         let title = format!(
             "{} {}   {} / {}  ({}%)",
@@ -55,7 +71,9 @@ pub fn draw_disks(f: &mut ratatui::Frame<'_>, area: Rect, m: Option<&Metrics>) {
             width: slot.width.saturating_sub(2),
             height: slot.height.saturating_sub(2),
         };
-        if inner_card.height == 0 { continue; }
+        if inner_card.height == 0 {
+            continue;
+        }
 
         let gauge_rect = Rect {
             x: inner_card.x,
@@ -70,4 +88,4 @@ pub fn draw_disks(f: &mut ratatui::Frame<'_>, area: Rect, m: Option<&Metrics>) {
 
         f.render_widget(g, gauge_rect);
     }
-}
+}

socktop/src/ui/gpu.rs

@@ -0,0 +1,123 @@
+use ratatui::{
+    layout::{Constraint, Direction, Layout, Rect},
+    style::{Color, Style},
+    text::Span,
+    widgets::{Block, Borders, Gauge, Paragraph},
+};
+
+use crate::types::Metrics;
+
+fn fmt_bytes(b: u64) -> String {
+    const KB: f64 = 1024.0;
+    const MB: f64 = KB * 1024.0;
+    const GB: f64 = MB * 1024.0;
+    let fb = b as f64;
+
+    if fb >= GB {
+        format!("{:.1}G", fb / GB)
+    } else if fb >= MB {
+        format!("{:.1}M", fb / MB)
+    } else if fb >= KB {
+        format!("{:.1}K", fb / KB)
+    } else {
+        format!("{b}B")
+    }
+}
+
+pub fn draw_gpu(f: &mut ratatui::Frame<'_>, area: Rect, m: Option<&Metrics>) {
+    let mut area = area;
+    let block = Block::default().borders(Borders::ALL).title("GPU");
+    f.render_widget(block, area);
+
+    // Guard: need some space inside the block
+    if area.height <= 2 || area.width <= 2 {
+        return;
+    }
+
+    // Inner padding consistent with the rest of the app
+    area.y += 1;
+    area.height = area.height.saturating_sub(2);
+    area.x += 1;
+    area.width = area.width.saturating_sub(2);
+
+    let Some(metrics) = m else {
+        return;
+    };
+
+    let Some(gpus) = metrics.gpus.as_ref() else {
+        f.render_widget(Paragraph::new("No GPUs"), area);
+        return;
+    };
+    if gpus.is_empty() {
+        f.render_widget(Paragraph::new("No GPUs"), area);
+        return;
+    }
+
+    // Show 3 rows per GPU: name, util bar, vram bar.
+    if area.height < 3 {
+        return;
+    }
+    let per_gpu_rows: u16 = 3;
+    let max_gpus = (area.height / per_gpu_rows) as usize;
+    let count = gpus.len().min(max_gpus);
+
+    let constraints = vec![Constraint::Length(1); count * per_gpu_rows as usize];
+    let rows = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints(constraints)
+        .split(area);
+
+    // Per bar horizontal layout: [gauge] [value]
+    let split_bar = |r: Rect| {
+        Layout::default()
+            .direction(Direction::Horizontal)
+            .constraints([
+                Constraint::Min(8),     // gauge column
+                Constraint::Length(24), // value column
+            ])
+            .split(r)
+    };
+
+    for i in 0..count {
+        let g = &gpus[i];
+
+        // Row 1: GPU name
+        let name_text = g.name.as_deref().unwrap_or("GPU");
+        let name_p = Paragraph::new(Span::raw(name_text)).style(Style::default().fg(Color::Gray));
+        f.render_widget(name_p, rows[i * 3]);
+
+        // Row 2: Utilization bar + right label
+        let util_cols = split_bar(rows[i * 3 + 1]);
+        let util = g.utilization.unwrap_or(0.0).clamp(0.0, 100.0) as u16;
+        let util_gauge = Gauge::default()
+            .gauge_style(Style::default().fg(Color::Green))
+            .label(Span::raw(""))
+            .ratio(util as f64 / 100.0);
+        f.render_widget(util_gauge, util_cols[0]);
+        f.render_widget(
+            Paragraph::new(Span::raw(format!("util: {util}%")))
+                .style(Style::default().fg(Color::Gray)),
+            util_cols[1],
+        );
+
+        // Row 3: VRAM bar + right label
+        let mem_cols = split_bar(rows[i * 3 + 2]);
+        let used = g.mem_used.unwrap_or(0);
+        let total = g.mem_total.unwrap_or(1);
+        let mem_ratio = used as f64 / total as f64;
+        let mem_pct = (mem_ratio * 100.0).round() as u16;
+
+        let mem_gauge = Gauge::default()
+            .gauge_style(Style::default().fg(Color::LightMagenta))
+            .label(Span::raw(""))
+            .ratio(mem_ratio);
+        f.render_widget(mem_gauge, mem_cols[0]);
+        let used_s = fmt_bytes(used);
+        let total_s = fmt_bytes(total);
+        f.render_widget(
+            Paragraph::new(Span::raw(format!("vram: {used_s}/{total_s} ({mem_pct}%)")))
+                .style(Style::default().fg(Color::Gray)),
+            mem_cols[1],
+        );
+    }
+}

socktop/src/ui/header.rs

@@ -1,20 +1,32 @@
 //! Top header with hostname and CPU temperature indicator.
 
+use crate::types::Metrics;
 use ratatui::{
     layout::Rect,
     widgets::{Block, Borders},
 };
-use crate::types::Metrics;
 
 pub fn draw_header(f: &mut ratatui::Frame<'_>, area: Rect, m: Option<&Metrics>) {
     let title = if let Some(mm) = m {
-        let temp = mm.cpu_temp_c.map(|t| {
+        let temp = mm
-            let icon = if t < 50.0 { "😎" } else if t < 85.0 { "⚠️" } else { "🔥" };
+            .cpu_temp_c
-            format!("CPU Temp: {:.1}°C {}", t, icon)
+            .map(|t| {
-        }).unwrap_or_else(|| "CPU Temp: N/A".into());
+                let icon = if t < 50.0 {
-        format!("socktop — host: {} | {}  (press 'q' to quit)", mm.hostname, temp)
+                    "😎"
+                } else if t < 85.0 {
+                    "⚠️"
+                } else {
+                    "🔥"
+                };
+                format!("CPU Temp: {t:.1}°C {icon}")
+            })
+            .unwrap_or_else(|| "CPU Temp: N/A".into());
+        format!(
+            "socktop — host: {} | {}  (press 'q' to quit)",
+            mm.hostname, temp
+        )
     } else {
         "socktop — connecting... (press 'q' to quit)".into()
     };
     f.render_widget(Block::default().title(title).borders(Borders::BOTTOM), area);
-}
+}

socktop/src/ui/mem.rs

@@ -1,18 +1,24 @@
 //! Memory gauge.
 
+use crate::types::Metrics;
+use crate::ui::util::human;
 use ratatui::{
     layout::Rect,
     style::{Color, Style},
     widgets::{Block, Borders, Gauge},
 };
-use crate::types::Metrics;
-use crate::ui::util::human;
 
 pub fn draw_mem(f: &mut ratatui::Frame<'_>, area: Rect, m: Option<&Metrics>) {
     let (used, total, pct) = if let Some(mm) = m {
-        let pct = if mm.mem_total > 0 { (mm.mem_used as f64 / mm.mem_total as f64 * 100.0) as u16 } else { 0 };
+        let pct = if mm.mem_total > 0 {
+            (mm.mem_used as f64 / mm.mem_total as f64 * 100.0) as u16
+        } else {
+            0
+        };
         (mm.mem_used, mm.mem_total, pct)
-    } else { (0, 0, 0) };
+    } else {
+        (0, 0, 0)
+    };
 
     let g = Gauge::default()
         .block(Block::default().borders(Borders::ALL).title("Memory"))
@@ -20,4 +26,4 @@ pub fn draw_mem(f: &mut ratatui::Frame<'_>, area: Rect, m: Option<&Metrics>) {
         .percent(pct)
         .label(format!("{} / {}", human(used), human(total)));
     f.render_widget(g, area);
-}
+}

socktop/src/ui/mod.rs

@@ -1,10 +1,12 @@
 //! UI module root: exposes drawing functions for individual panels.
 
-pub mod header;
 pub mod cpu;
-pub mod mem;
-pub mod swap;
 pub mod disks;
+pub mod gpu;
+pub mod header;
+pub mod mem;
 pub mod net;
 pub mod processes;
-pub mod util;
+pub mod swap;
+pub mod theme;
+pub mod util;

socktop/src/ui/net.rs

@@ -1,11 +1,11 @@
 //! Network sparklines (download/upload).
 
-use std::collections::VecDeque;
 use ratatui::{
     layout::Rect,
     style::{Color, Style},
     widgets::{Block, Borders, Sparkline},
 };
+use std::collections::VecDeque;
 
 pub fn draw_net_spark(
     f: &mut ratatui::Frame<'_>,
@@ -19,8 +19,12 @@ pub fn draw_net_spark(
     let data: Vec<u64> = hist.iter().skip(start).cloned().collect();
 
     let spark = Sparkline::default()
-        .block(Block::default().borders(Borders::ALL).title(title.to_string()))
+        .block(
+            Block::default()
+                .borders(Borders::ALL)
+                .title(title.to_string()),
+        )
         .data(&data)
         .style(Style::default().fg(color));
     f.render_widget(spark, area);
-}
+}

socktop/src/ui/processes.rs

@@ -1,29 +1,105 @@
-//! Top processes table with per-cell coloring and zebra striping.
+//! Top processes table with per-cell coloring, zebra striping, sorting, and a scrollbar.
 
-use ratatui::{
+use crossterm::event::{MouseButton, MouseEvent, MouseEventKind};
-    layout::{Constraint, Rect},
-    style::{Color, Style},
-    widgets::{Block, Borders, Cell, Row, Table},
-};
 use ratatui::style::Modifier;
+use ratatui::{
+    layout::{Constraint, Direction, Layout, Rect},
+    style::{Color, Style},
+    text::{Line, Span},
+    widgets::{Block, Borders, Paragraph, Table},
+};
+use std::cmp::Ordering;
 
 use crate::types::Metrics;
+use crate::ui::cpu::{per_core_clamp, per_core_handle_scrollbar_mouse};
+use crate::ui::theme::{SB_ARROW, SB_THUMB, SB_TRACK};
 use crate::ui::util::human;
 
-pub fn draw_top_processes(f: &mut ratatui::Frame<'_>, area: Rect, m: Option<&Metrics>) {
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
-    let Some(mm) = m else {
+pub enum ProcSortBy {
-        f.render_widget(Block::default().borders(Borders::ALL).title("Top Processes"), area);
+    #[default]
+    CpuDesc,
+    MemDesc,
+}
+
+// Keep the original header widths here so drawing and hit-testing match.
+const COLS: [Constraint; 5] = [
+    Constraint::Length(8),      // PID
+    Constraint::Percentage(40), // Name
+    Constraint::Length(8),      // CPU %
+    Constraint::Length(12),     // Mem
+    Constraint::Length(8),      // Mem %
+];
+
+pub fn draw_top_processes(
+    f: &mut ratatui::Frame<'_>,
+    area: Rect,
+    m: Option<&Metrics>,
+    scroll_offset: usize,
+    sort_by: ProcSortBy,
+) {
+    // Draw outer block and title
+    let Some(mm) = m else { return };
+    let total = mm.process_count.unwrap_or(mm.top_processes.len());
+    let block = Block::default()
+        .borders(Borders::ALL)
+        .title(format!("Top Processes ({total} total)"));
+    f.render_widget(block, area);
+
+    // Inner area and content area (reserve 2 columns for scrollbar)
+    let inner = Rect {
+        x: area.x + 1,
+        y: area.y + 1,
+        width: area.width.saturating_sub(2),
+        height: area.height.saturating_sub(2),
+    };
+    if inner.height < 1 || inner.width < 3 {
         return;
+    }
+    let content = Rect {
+        x: inner.x,
+        y: inner.y,
+        width: inner.width.saturating_sub(2),
+        height: inner.height,
     };
 
-    let total_mem_bytes = mm.mem_total.max(1);
+    // Sort rows (by CPU% or Mem bytes), descending.
-    let title = format!("Top Processes ({} total)", mm.process_count);
+    let mut idxs: Vec<usize> = (0..mm.top_processes.len()).collect();
-    let peak_cpu = mm.top_processes.iter().map(|p| p.cpu_usage).fold(0.0_f32, f32::max);
+    match sort_by {
+        ProcSortBy::CpuDesc => idxs.sort_by(|&a, &b| {
+            let aa = mm.top_processes[a].cpu_usage;
+            let bb = mm.top_processes[b].cpu_usage;
+            bb.partial_cmp(&aa).unwrap_or(Ordering::Equal)
+        }),
+        ProcSortBy::MemDesc => idxs.sort_by(|&a, &b| {
+            let aa = mm.top_processes[a].mem_bytes;
+            let bb = mm.top_processes[b].mem_bytes;
+            bb.cmp(&aa)
+        }),
+    }
 
-    let rows: Vec<Row> = mm.top_processes.iter().enumerate().map(|(i, p)| {
+    // Scrolling
+    let total_rows = idxs.len();
+    let header_rows = 1usize;
+    let viewport_rows = content.height.saturating_sub(header_rows as u16) as usize;
+    let max_off = total_rows.saturating_sub(viewport_rows);
+    let offset = scroll_offset.min(max_off);
+    let show_n = total_rows.saturating_sub(offset).min(viewport_rows);
+
+    // Build visible rows
+    let total_mem_bytes = mm.mem_total.max(1);
+    let peak_cpu = mm
+        .top_processes
+        .iter()
+        .map(|p| p.cpu_usage)
+        .fold(0.0_f32, f32::max);
+
+    let rows_iter = idxs.iter().skip(offset).take(show_n).map(|&ix| {
+        let p = &mm.top_processes[ix];
         let mem_pct = (p.mem_bytes as f64 / total_mem_bytes as f64) * 100.0;
 
-        let cpu_fg = match p.cpu_usage {
+        let cpu_val = p.cpu_usage;
+        let cpu_fg = match cpu_val {
             x if x < 25.0 => Color::Green,
             x if x < 60.0 => Color::Yellow,
             _ => Color::Red,
@@ -34,38 +110,157 @@ pub fn draw_top_processes(f: &mut ratatui::Frame<'_>, area: Rect, m: Option<&Met
             _ => Color::Red,
         };
 
-        let zebra = if i % 2 == 0 { Style::default().fg(Color::Gray) } else { Style::default() };
+        let emphasis = if (cpu_val - peak_cpu).abs() < f32::EPSILON {
-
-        let emphasis = if (p.cpu_usage - peak_cpu).abs() < f32::EPSILON {
             Style::default().add_modifier(Modifier::BOLD)
-        } else { Style::default() };
+        } else {
+            Style::default()
+        };
 
-        Row::new(vec![
+        let cpu_str = fmt_cpu_pct(cpu_val);
-            Cell::from(p.pid.to_string()).style(Style::default().fg(Color::DarkGray)),
+
-            Cell::from(p.name.clone()),
+        ratatui::widgets::Row::new(vec![
-            Cell::from(format!("{:.1}%", p.cpu_usage)).style(Style::default().fg(cpu_fg)),
+            ratatui::widgets::Cell::from(p.pid.to_string())
-            Cell::from(human(p.mem_bytes)),
+                .style(Style::default().fg(Color::DarkGray)),
-            Cell::from(format!("{:.2}%", mem_pct)).style(Style::default().fg(mem_fg)),
+            ratatui::widgets::Cell::from(p.name.clone()),
+            ratatui::widgets::Cell::from(cpu_str).style(Style::default().fg(cpu_fg)),
+            ratatui::widgets::Cell::from(human(p.mem_bytes)),
+            ratatui::widgets::Cell::from(format!("{mem_pct:.2}%"))
+                .style(Style::default().fg(mem_fg)),
         ])
-        .style(zebra.patch(emphasis))
+        .style(emphasis)
-    }).collect();
+    });
 
-    let header = Row::new(vec!["PID", "Name", "CPU %", "Mem", "Mem %"])
+    // Header with sort indicator
-        .style(Style::default().fg(Color::Cyan).add_modifier(Modifier::BOLD));
+    let cpu_hdr = match sort_by {
+        ProcSortBy::CpuDesc => "CPU % •",
+        _ => "CPU %",
+    };
+    let mem_hdr = match sort_by {
+        ProcSortBy::MemDesc => "Mem •",
+        _ => "Mem",
+    };
+    let header = ratatui::widgets::Row::new(vec!["PID", "Name", cpu_hdr, mem_hdr, "Mem %"]).style(
+        Style::default()
+            .fg(Color::Cyan)
+            .add_modifier(Modifier::BOLD),
+    );
 
-    let table = Table::new(
+    // Render table inside content area (no borders here; outer block already drawn)
-            rows,
+    let table = Table::new(rows_iter, COLS.to_vec())
-            vec![
-                Constraint::Length(8),
-                Constraint::Percentage(40),
-                Constraint::Length(8),
-                Constraint::Length(12),
-                Constraint::Length(8),
-            ],
-        )
         .header(header)
-        .column_spacing(1)
+        .column_spacing(1);
-        .block(Block::default().borders(Borders::ALL).title(title));
+    f.render_widget(table, content);
 
-    f.render_widget(table, area);
+    // Draw scrollbar like CPU pane
-}
+    let scroll_area = Rect {
+        x: inner.x + inner.width.saturating_sub(1),
+        y: inner.y,
+        width: 1,
+        height: inner.height,
+    };
+    if scroll_area.height >= 3 {
+        let track = (scroll_area.height - 2) as usize;
+        let total = total_rows.max(1);
+        let view = viewport_rows.clamp(1, total);
+        let max_off = total.saturating_sub(view);
+
+        let thumb_len = (track * view).div_ceil(total).max(1).min(track);
+        let thumb_top = if max_off == 0 {
+            0
+        } else {
+            ((track - thumb_len) * offset + max_off / 2) / max_off
+        };
+
+        // Build lines: top arrow, track (with thumb), bottom arrow
+        let mut lines: Vec<Line> = Vec::with_capacity(scroll_area.height as usize);
+        lines.push(Line::from(Span::styled("▲", Style::default().fg(SB_ARROW))));
+        for i in 0..track {
+            if i >= thumb_top && i < thumb_top + thumb_len {
+                lines.push(Line::from(Span::styled("█", Style::default().fg(SB_THUMB))));
+            } else {
+                lines.push(Line::from(Span::styled("│", Style::default().fg(SB_TRACK))));
+            }
+        }
+        lines.push(Line::from(Span::styled("▼", Style::default().fg(SB_ARROW))));
+        f.render_widget(Paragraph::new(lines), scroll_area);
+    }
+}
+
+fn fmt_cpu_pct(v: f32) -> String {
+    format!("{:>5.1}", v.clamp(0.0, 100.0))
+}
+
+/// Handle keyboard scrolling (Up/Down/PageUp/PageDown/Home/End)
+pub fn processes_handle_key(
+    scroll_offset: &mut usize,
+    key: crossterm::event::KeyEvent,
+    page_size: usize,
+) {
+    crate::ui::cpu::per_core_handle_key(scroll_offset, key, page_size);
+}
+
+/// Handle mouse for content scrolling and scrollbar dragging.
+/// Returns Some(new_sort) if the header "CPU %" or "Mem" was clicked.
+pub fn processes_handle_mouse(
+    scroll_offset: &mut usize,
+    drag: &mut Option<crate::ui::cpu::PerCoreScrollDrag>,
+    mouse: MouseEvent,
+    area: Rect,
+    total_rows: usize,
+) -> Option<ProcSortBy> {
+    // Inner and content areas (match draw_top_processes)
+    let inner = Rect {
+        x: area.x + 1,
+        y: area.y + 1,
+        width: area.width.saturating_sub(2),
+        height: area.height.saturating_sub(2),
+    };
+    if inner.height == 0 || inner.width <= 2 {
+        return None;
+    }
+    let content = Rect {
+        x: inner.x,
+        y: inner.y,
+        width: inner.width.saturating_sub(2),
+        height: inner.height,
+    };
+
+    // Scrollbar interactions (click arrows/page/drag)
+    per_core_handle_scrollbar_mouse(scroll_offset, drag, mouse, area, total_rows);
+
+    // Wheel scrolling when inside the content
+    crate::ui::cpu::per_core_handle_mouse(scroll_offset, mouse, content, content.height as usize);
+
+    // Header click to change sort
+    let header_area = Rect {
+        x: content.x,
+        y: content.y,
+        width: content.width,
+        height: 1,
+    };
+    let inside_header = mouse.row == header_area.y
+        && mouse.column >= header_area.x
+        && mouse.column < header_area.x + header_area.width;
+
+    if inside_header && matches!(mouse.kind, MouseEventKind::Down(MouseButton::Left)) {
+        // Split header into the same columns
+        let cols = Layout::default()
+            .direction(Direction::Horizontal)
+            .constraints(COLS.to_vec())
+            .split(header_area);
+        if mouse.column >= cols[2].x && mouse.column < cols[2].x + cols[2].width {
+            return Some(ProcSortBy::CpuDesc);
+        }
+        if mouse.column >= cols[3].x && mouse.column < cols[3].x + cols[3].width {
+            return Some(ProcSortBy::MemDesc);
+        }
+    }
+
+    // Clamp to valid range
+    per_core_clamp(
+        scroll_offset,
+        total_rows,
+        (content.height.saturating_sub(1)) as usize,
+    );
+    None
+}

socktop/src/ui/swap.rs

@@ -1,18 +1,24 @@
 //! Swap gauge.
 
+use crate::types::Metrics;
+use crate::ui::util::human;
 use ratatui::{
     layout::Rect,
     style::{Color, Style},
     widgets::{Block, Borders, Gauge},
 };
-use crate::types::Metrics;
-use crate::ui::util::human;
 
 pub fn draw_swap(f: &mut ratatui::Frame<'_>, area: Rect, m: Option<&Metrics>) {
     let (used, total, pct) = if let Some(mm) = m {
-        let pct = if mm.swap_total > 0 { (mm.swap_used as f64 / mm.swap_total as f64 * 100.0) as u16 } else { 0 };
+        let pct = if mm.swap_total > 0 {
+            (mm.swap_used as f64 / mm.swap_total as f64 * 100.0) as u16
+        } else {
+            0
+        };
         (mm.swap_used, mm.swap_total, pct)
-    } else { (0, 0, 0) };
+    } else {
+        (0, 0, 0)
+    };
 
     let g = Gauge::default()
         .block(Block::default().borders(Borders::ALL).title("Swap"))
@@ -20,4 +26,4 @@ pub fn draw_swap(f: &mut ratatui::Frame<'_>, area: Rect, m: Option<&Metrics>) {
         .percent(pct)
         .label(format!("{} / {}", human(used), human(total)));
     f.render_widget(g, area);
-}
+}

socktop/src/ui/theme.rs

@@ -0,0 +1,8 @@
+//! Shared UI theme constants.
+
+use ratatui::style::Color;
+
+// Scrollbar colors (same look as before)
+pub const SB_ARROW: Color = Color::Rgb(170, 170, 180);
+pub const SB_TRACK: Color = Color::Rgb(170, 170, 180);
+pub const SB_THUMB: Color = Color::Rgb(170, 170, 180);

socktop/src/ui/util.rs

@@ -3,31 +3,49 @@
 pub fn human(b: u64) -> String {
     const K: f64 = 1024.0;
     let b = b as f64;
-    if b < K { return format!("{b:.0}B"); }
+    if b < K {
+        return format!("{b:.0}B");
+    }
     let kb = b / K;
-    if kb < K { return format!("{kb:.1}KB"); }
+    if kb < K {
+        return format!("{kb:.1}KB");
+    }
     let mb = kb / K;
-    if mb < K { return format!("{mb:.1}MB"); }
+    if mb < K {
+        return format!("{mb:.1}MB");
+    }
     let gb = mb / K;
-    if gb < K { return format!("{gb:.1}GB"); }
+    if gb < K {
+        return format!("{gb:.1}GB");
+    }
     let tb = gb / K;
     format!("{tb:.2}TB")
 }
 
 pub fn truncate_middle(s: &str, max: usize) -> String {
-    if s.len() <= max { return s.to_string(); }
+    if s.len() <= max {
-    if max <= 3 { return "...".into(); }
+        return s.to_string();
+    }
+    if max <= 3 {
+        return "...".into();
+    }
     let keep = max - 3;
     let left = keep / 2;
     let right = keep - left;
-    format!("{}...{}", &s[..left], &s[s.len()-right..])
+    format!("{}...{}", &s[..left], &s[s.len() - right..])
 }
 
 pub fn disk_icon(name: &str) -> &'static str {
     let n = name.to_ascii_lowercase();
-    if n.contains(':') { "🗄️" }
+    if n.contains(':') {
-    else if n.contains("nvme") { "⚡" }
+        "🗄️"
-    else if n.starts_with("sd") { "💽" }
+    } else if n.contains("nvme") {
-    else if n.contains("overlay") { "📦" }
+        "⚡"
-    else { "🖴" }
+    } else if n.starts_with("sd") {
-}
+        "💽"
+    } else if n.contains("overlay") {
+        "📦"
+    } else {
+        "🖴"
+    }
+}

socktop/src/ws.rs

@@ -1,28 +1,252 @@
 //! Minimal WebSocket client helpers for requesting metrics from the agent.
 
+use flate2::read::GzDecoder;
+use futures_util::{SinkExt, StreamExt};
+use std::io::{Cursor, Read};
+use std::sync::OnceLock;
 use tokio::net::TcpStream;
+use tokio::time::{timeout, Duration};
 use tokio_tungstenite::{connect_async, tungstenite::Message, MaybeTlsStream, WebSocketStream};
 
-use crate::types::Metrics;
+use crate::types::{DiskInfo, Metrics, ProcessesPayload};
 
 pub type WsStream = WebSocketStream<MaybeTlsStream<TcpStream>>;
 
+#[inline]
+fn debug_on() -> bool {
+    static ON: OnceLock<bool> = OnceLock::new();
+    *ON.get_or_init(|| {
+        std::env::var("SOCKTOP_DEBUG")
+            .map(|v| v != "0")
+            .unwrap_or(false)
+    })
+}
+
+fn log_msg(msg: &Message) {
+    match msg {
+        Message::Binary(b) => eprintln!("ws: Binary {} bytes", b.len()),
+        Message::Text(s) => eprintln!("ws: Text {} bytes", s.len()),
+        Message::Close(_) => eprintln!("ws: Close"),
+        _ => eprintln!("ws: Other frame"),
+    }
+}
+
 // Connect to the agent and return the WS stream
 pub async fn connect(url: &str) -> Result<WsStream, Box<dyn std::error::Error>> {
+    if debug_on() {
+        eprintln!("ws: connecting to {url}");
+    }
     let (ws, _) = connect_async(url).await?;
+    if debug_on() {
+        eprintln!("ws: connected");
+    }
     Ok(ws)
 }
 
-// Send a "get_metrics" request and await a single JSON reply
+// Decompress a gzip-compressed binary frame into a String.
-pub async fn request_metrics(ws: &mut WsStream) -> Option<Metrics> {
+fn gunzip_to_string(bytes: &[u8]) -> Option<String> {
-    if ws.send(Message::Text("get_metrics".into())).await.is_err() {
+    let cursor = Cursor::new(bytes);
-        return None;
+    let mut dec = GzDecoder::new(cursor);
+    let mut out = String::new();
+    dec.read_to_string(&mut out).ok()?;
+    if debug_on() {
+        eprintln!("ws: gunzip decoded {} bytes", out.len());
     }
-    match ws.next().await {
+    Some(out)
-        Some(Ok(Message::Text(json))) => serde_json::from_str::<Metrics>(&json).ok(),
+}
+
+fn message_to_json(msg: &Message) -> Option<String> {
+    match msg {
+        Message::Binary(b) => {
+            if debug_on() {
+                eprintln!("ws: <- Binary frame {} bytes", b.len());
+            }
+            if let Some(s) = gunzip_to_string(b) {
+                return Some(s);
+            }
+            // Fallback: try interpreting as UTF-8 JSON in a binary frame
+            String::from_utf8(b.clone()).ok()
+        }
+        Message::Text(s) => {
+            if debug_on() {
+                eprintln!("ws: <- Text frame {} bytes", s.len());
+            }
+            Some(s.clone())
+        }
         _ => None,
     }
 }
 
-// Re-export SinkExt/StreamExt for call sites
+// Suppress dead_code until these are wired into the app
-use futures_util::{SinkExt, StreamExt};
+#[allow(dead_code)]
+pub enum Payload {
+    Metrics(Metrics),
+    Disks(Vec<DiskInfo>),
+    Processes(ProcessesPayload),
+}
+
+fn parse_any_payload(json: &str) -> Result<Payload, serde_json::Error> {
+    if let Ok(m) = serde_json::from_str::<Metrics>(json) {
+        return Ok(Payload::Metrics(m));
+    }
+    if let Ok(d) = serde_json::from_str::<Vec<DiskInfo>>(json) {
+        return Ok(Payload::Disks(d));
+    }
+    if let Ok(p) = serde_json::from_str::<ProcessesPayload>(json) {
+        return Ok(Payload::Processes(p));
+    }
+    Err(serde_json::Error::io(std::io::Error::new(
+        std::io::ErrorKind::InvalidData,
+        "unknown payload",
+    )))
+}
+
+// Send a "get_metrics" request and await a single JSON reply
+pub async fn request_metrics(ws: &mut WsStream) -> Option<Metrics> {
+    if debug_on() {
+        eprintln!("ws: -> get_metrics");
+    }
+    if ws.send(Message::Text("get_metrics".into())).await.is_err() {
+        return None;
+    }
+    // Drain a few messages until we find Metrics (handle out-of-order replies)
+    for _ in 0..8 {
+        match timeout(Duration::from_millis(800), ws.next()).await {
+            Ok(Some(Ok(msg))) => {
+                if debug_on() {
+                    log_msg(&msg);
+                }
+                if let Some(json) = message_to_json(&msg) {
+                    match parse_any_payload(&json) {
+                        Ok(Payload::Metrics(m)) => return Some(m),
+                        Ok(Payload::Disks(_)) => {
+                            if debug_on() {
+                                eprintln!("ws: got Disks while waiting for Metrics");
+                            }
+                        }
+                        Ok(Payload::Processes(_)) => {
+                            if debug_on() {
+                                eprintln!("ws: got Processes while waiting for Metrics");
+                            }
+                        }
+                        Err(_e) => {
+                            if debug_on() {
+                                eprintln!(
+                                    "ws: unknown payload while waiting for Metrics (len={})",
+                                    json.len()
+                                );
+                            }
+                        }
+                    }
+                } else if debug_on() {
+                    eprintln!("ws: non-json frame while waiting for Metrics");
+                }
+            }
+            Ok(Some(Err(_e))) => continue,
+            Ok(None) => return None,
+            Err(_elapsed) => continue,
+        }
+    }
+    None
+}
+
+// Send a "get_disks" request and await a JSON Vec<DiskInfo>
+pub async fn request_disks(ws: &mut WsStream) -> Option<Vec<DiskInfo>> {
+    if debug_on() {
+        eprintln!("ws: -> get_disks");
+    }
+    if ws.send(Message::Text("get_disks".into())).await.is_err() {
+        return None;
+    }
+    for _ in 0..8 {
+        match timeout(Duration::from_millis(800), ws.next()).await {
+            Ok(Some(Ok(msg))) => {
+                if debug_on() {
+                    log_msg(&msg);
+                }
+                if let Some(json) = message_to_json(&msg) {
+                    match parse_any_payload(&json) {
+                        Ok(Payload::Disks(d)) => return Some(d),
+                        Ok(Payload::Metrics(_)) => {
+                            if debug_on() {
+                                eprintln!("ws: got Metrics while waiting for Disks");
+                            }
+                        }
+                        Ok(Payload::Processes(_)) => {
+                            if debug_on() {
+                                eprintln!("ws: got Processes while waiting for Disks");
+                            }
+                        }
+                        Err(_e) => {
+                            if debug_on() {
+                                eprintln!(
+                                    "ws: unknown payload while waiting for Disks (len={})",
+                                    json.len()
+                                );
+                            }
+                        }
+                    }
+                } else if debug_on() {
+                    eprintln!("ws: non-json frame while waiting for Disks");
+                }
+            }
+            Ok(Some(Err(_e))) => continue,
+            Ok(None) => return None,
+            Err(_elapsed) => continue,
+        }
+    }
+    None
+}
+
+// Send a "get_processes" request and await a JSON ProcessesPayload
+pub async fn request_processes(ws: &mut WsStream) -> Option<ProcessesPayload> {
+    if debug_on() {
+        eprintln!("ws: -> get_processes");
+    }
+    if ws
+        .send(Message::Text("get_processes".into()))
+        .await
+        .is_err()
+    {
+        return None;
+    }
+    for _ in 0..16 {
+        // allow a few more cycles due to gzip size
+        match timeout(Duration::from_millis(1200), ws.next()).await {
+            Ok(Some(Ok(msg))) => {
+                if debug_on() {
+                    log_msg(&msg);
+                }
+                if let Some(json) = message_to_json(&msg) {
+                    match parse_any_payload(&json) {
+                        Ok(Payload::Processes(p)) => return Some(p),
+                        Ok(Payload::Metrics(_)) => {
+                            if debug_on() {
+                                eprintln!("ws: got Metrics while waiting for Processes");
+                            }
+                        }
+                        Ok(Payload::Disks(_)) => {
+                            if debug_on() {
+                                eprintln!("ws: got Disks while waiting for Processes");
+                            }
+                        }
+                        Err(_e) => {
+                            if debug_on() {
+                                eprintln!(
+                                    "ws: unknown payload while waiting for Processes (len={})",
+                                    json.len()
+                                );
+                            }
+                        }
+                    }
+                } else if debug_on() {
+                    eprintln!("ws: non-json frame while waiting for Processes");
+                }
+            }
+            Ok(Some(Err(_e))) => continue,
+            Ok(None) => return None,
+            Err(_elapsed) => continue,
+        }
+    }
+    None
+}

socktop/tests/ws_probe.rs

@@ -0,0 +1,27 @@
+use socktop::ws::{connect, request_metrics, request_processes};
+
+// Integration probe: only runs when SOCKTOP_WS is set to an agent WebSocket URL.
+// Example: SOCKTOP_WS=ws://127.0.0.1:3000/ws cargo test -p socktop --test ws_probe -- --nocapture
+#[tokio::test]
+async fn probe_ws_endpoints() {
+    // Gate the test to avoid CI failures when no agent is running.
+    let url = match std::env::var("SOCKTOP_WS") {
+        Ok(v) if !v.is_empty() => v,
+        _ => {
+            eprintln!(
+                "skipping ws_probe: set SOCKTOP_WS=ws://host:port/ws to run this integration test"
+            );
+            return;
+        }
+    };
+
+    let mut ws = connect(&url).await.expect("connect ws");
+
+    // Should get fast metrics quickly
+    let m = request_metrics(&mut ws).await;
+    assert!(m.is_some(), "expected Metrics payload within timeout");
+
+    // Processes may be gzipped and a bit slower, but should arrive
+    let p = request_processes(&mut ws).await;
+    assert!(p.is_some(), "expected Processes payload within timeout");
+}

socktop_agent/Cargo.toml

@@ -1,17 +1,23 @@
 [package]
 name = "socktop_agent"
-version = "0.1.0"
+version = "0.1.11"
 authors = ["Jason Witty <jasonpwitty+socktop@proton.me>"]
 description = "Remote system monitor over WebSocket, TUI like top"
 edition = "2021"
+license = "MIT"
 
 [dependencies]
 tokio = { version = "1", features = ["full"] }
 axum = { version = "0.7", features = ["ws", "macros"] }
-sysinfo = "0.36.1"
+sysinfo = { version = "0.37", features = ["network", "disk", "component"] }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
+flate2 = { version = "1", default-features = false, features = ["rust_backend"] }
 futures = "0.3"
 futures-util = "0.3.31"
 tracing = "0.1"
-tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+nvml-wrapper = "0.10"
+gfxinfo = "0.1.2"
+tungstenite = "0.27.0"
+once_cell = "1.19"

socktop_agent/src/gpu.rs

@@ -0,0 +1,24 @@
+// gpu.rs
+use gfxinfo::active_gpu;
+
+#[derive(Debug, Clone, serde::Serialize)]
+pub struct GpuMetrics {
+    pub name: String,
+    pub utilization_gpu_pct: u32, // 0..100
+    pub mem_used_bytes: u64,
+    pub mem_total_bytes: u64,
+}
+
+pub fn collect_all_gpus() -> Result<Vec<GpuMetrics>, Box<dyn std::error::Error>> {
+    let gpu = active_gpu()?; // Use ? to unwrap Result
+    let info = gpu.info();
+
+    let metrics = GpuMetrics {
+        name: gpu.model().to_string(),
+        utilization_gpu_pct: info.load_pct() as u32,
+        mem_used_bytes: info.used_vram(),
+        mem_total_bytes: info.total_vram(),
+    };
+
+    Ok(vec![metrics])
+}

socktop_agent/src/main.rs

@@ -1,80 +1,45 @@
 //! socktop agent entrypoint: sets up sysinfo handles, launches a sampler,
 //! and serves a WebSocket endpoint at /ws.
 
+mod gpu;
 mod metrics;
 mod sampler;
 mod state;
-mod ws;
 mod types;
+mod ws;
 
 use axum::{routing::get, Router};
-use std::{collections::HashMap, net::SocketAddr, sync::Arc, time::Duration, sync::atomic::AtomicUsize};
+use std::net::SocketAddr;
-use sysinfo::{
-    Components, CpuRefreshKind, Disks, MemoryRefreshKind, Networks, ProcessRefreshKind, RefreshKind,
-    System,
-};
-use tokio::sync::{Mutex, RwLock, Notify};
-use tracing_subscriber::EnvFilter;
 
-use state::{AppState, SharedTotals};
+use crate::sampler::{spawn_disks_sampler, spawn_process_sampler, spawn_sampler};
-use sampler::spawn_sampler;
+use state::AppState;
 use ws::ws_handler;
 
 #[tokio::main]
 async fn main() {
+    tracing_subscriber::fmt::init();
 
-    // Init logging; configure with RUST_LOG (e.g., RUST_LOG=info).
+    let state = AppState::new();
-    tracing_subscriber::fmt()
-        .with_env_filter(EnvFilter::from_default_env())
-        .with_target(false)
-        .compact()
-        .init();
-
-    // sysinfo build specifics (scopes what refresh_all() will touch internally)
-    let refresh_kind = RefreshKind::nothing()
-        .with_cpu(CpuRefreshKind::everything())
-        .with_memory(MemoryRefreshKind::everything())
-        .with_processes(ProcessRefreshKind::everything());
-
-    // Initialize sysinfo handles once and keep them alive
-    let mut sys = System::new_with_specifics(refresh_kind);
-    sys.refresh_all();
-
-    let mut nets = Networks::new();
-    nets.refresh(true);
-
-    let mut components = Components::new();
-    components.refresh(true);
-
-    let mut disks = Disks::new();
-    disks.refresh(true);
-
-    // Shared state across requests
-    let state = AppState {
-        sys: Arc::new(Mutex::new(sys)),
-        nets: Arc::new(Mutex::new(nets)),
-        net_totals: Arc::new(Mutex::new(HashMap::<String, (u64, u64)>::new())) as SharedTotals,
-        components: Arc::new(Mutex::new(components)),
-        disks: Arc::new(Mutex::new(disks)),
-        last_json: Arc::new(RwLock::new(String::new())),
-        // new: adaptive sampling controls
-        client_count: Arc::new(AtomicUsize::new(0)),
-        wake_sampler: Arc::new(Notify::new()),
-        auth_token: std::env::var("SOCKTOP_TOKEN").ok().filter(|s| !s.is_empty()),
-    };
 
     // Start background sampler (adjust cadence as needed)
-    let _sampler = spawn_sampler(state.clone(), Duration::from_millis(500));
+    // 500ms fast metrics
+    let _h_fast = spawn_sampler(state.clone(), std::time::Duration::from_millis(500));
+    // 2s processes (top 50)
+    let _h_procs = spawn_process_sampler(state.clone(), std::time::Duration::from_secs(2), 50);
+    // 5s disks
+    let _h_disks = spawn_disks_sampler(state.clone(), std::time::Duration::from_secs(5));
 
     // Web app
     let port = resolve_port();
-    let app = Router::new().route("/ws", get(ws_handler)).with_state(state);
+    let app = Router::new()
+        .route("/ws", get(ws_handler))
+        .with_state(state);
 
     let addr = SocketAddr::from(([0, 0, 0, 0], port));
 
     //output to console
-    println!("Remote agent running at http://{}", addr);
+    println!("Remote agent running at http://{addr}");
-    println!("WebSocket endpoint: ws://{}/ws", addr);
+    println!("WebSocket endpoint: ws://{addr}/ws");
 
     //trace logging
     tracing::info!("Remote agent running at http://{} (ws at /ws)", addr);
@@ -82,7 +47,6 @@ async fn main() {
 
     let listener = tokio::net::TcpListener::bind(addr).await.unwrap();
     axum::serve(listener, app).await.unwrap();
-
 }
 
 // Resolve the listening port from CLI args/env with a 3000 default.
@@ -97,7 +61,7 @@ fn resolve_port() -> u16 {
                 return p;
             }
         }
-        eprintln!("Warning: invalid SOCKTOP_PORT='{}'; using default {}", s, DEFAULT);
+        eprintln!("Warning: invalid SOCKTOP_PORT='{s}'; using default {DEFAULT}");
     }
 
     let mut args = std::env::args().skip(1);
@@ -108,12 +72,12 @@ fn resolve_port() -> u16 {
                     match v.parse::<u16>() {
                         Ok(p) if p != 0 => return p,
                         _ => {
-                            eprintln!("Invalid port '{}'; using default {}", v, DEFAULT);
+                            eprintln!("Invalid port '{v}'; using default {DEFAULT}");
                             return DEFAULT;
                         }
                     }
                 } else {
-                    eprintln!("Missing value for {} ; using default {}", arg, DEFAULT);
+                    eprintln!("Missing value for {arg} ; using default {DEFAULT}");
                     return DEFAULT;
                 }
             }
@@ -133,4 +97,3 @@ fn resolve_port() -> u16 {
 
     DEFAULT
 }
-

socktop_agent/src/metrics.rs

@@ -1,128 +1,381 @@
-//! Metrics collection using sysinfo. Keeps sysinfo handles in AppState to
+//! Metrics collection using sysinfo for socktop_agent.
-//! avoid repeated allocations and allow efficient refreshes.
 
+use crate::gpu::collect_all_gpus;
 use crate::state::AppState;
-use crate::types::{DiskInfo, Metrics, NetworkInfo, ProcessInfo};
+use crate::types::{DiskInfo, Metrics, NetworkInfo, ProcessInfo, ProcessesPayload};
-use sysinfo::{Components, System};
+use once_cell::sync::OnceCell;
+#[cfg(target_os = "linux")]
+use std::collections::HashMap;
+#[cfg(target_os = "linux")]
+use std::fs;
+#[cfg(target_os = "linux")]
+use std::io;
+use std::sync::Mutex;
+use std::time::{Duration, Instant};
+use sysinfo::{ProcessRefreshKind, ProcessesToUpdate, System};
+use tracing::warn;
 
-pub async fn collect_metrics(state: &AppState) -> Metrics {
+// Runtime toggles (read once)
-    // System (CPU/mem/proc)
+fn gpu_enabled() -> bool {
+    static ON: OnceCell<bool> = OnceCell::new();
+    *ON.get_or_init(|| {
+        std::env::var("SOCKTOP_AGENT_GPU")
+            .map(|v| v != "0")
+            .unwrap_or(true)
+    })
+}
+fn temp_enabled() -> bool {
+    static ON: OnceCell<bool> = OnceCell::new();
+    *ON.get_or_init(|| {
+        std::env::var("SOCKTOP_AGENT_TEMP")
+            .map(|v| v != "0")
+            .unwrap_or(true)
+    })
+}
+
+// Tiny TTL caches to avoid rescanning sensors every 500ms
+const TTL: Duration = Duration::from_millis(1500);
+struct TempCache {
+    at: Option<Instant>,
+    v: Option<f32>,
+}
+static TEMP: OnceCell<Mutex<TempCache>> = OnceCell::new();
+
+struct GpuCache {
+    at: Option<Instant>,
+    v: Option<Vec<crate::gpu::GpuMetrics>>,
+}
+static GPUC: OnceCell<Mutex<GpuCache>> = OnceCell::new();
+
+fn cached_temp() -> Option<f32> {
+    if !temp_enabled() {
+        return None;
+    }
+    let now = Instant::now();
+    let lock = TEMP.get_or_init(|| Mutex::new(TempCache { at: None, v: None }));
+    let mut c = lock.lock().ok()?;
+    if c.at.is_none_or(|t| now.duration_since(t) >= TTL) {
+        c.at = Some(now);
+        // caller will fill this; we just hold a slot
+        c.v = None;
+    }
+    c.v
+}
+
+fn set_temp(v: Option<f32>) {
+    if let Some(lock) = TEMP.get() {
+        if let Ok(mut c) = lock.lock() {
+            c.v = v;
+            c.at = Some(Instant::now());
+        }
+    }
+}
+
+fn cached_gpus() -> Option<Vec<crate::gpu::GpuMetrics>> {
+    if !gpu_enabled() {
+        return None;
+    }
+    let now = Instant::now();
+    let lock = GPUC.get_or_init(|| Mutex::new(GpuCache { at: None, v: None }));
+    let mut c = lock.lock().ok()?;
+    if c.at.is_none_or(|t| now.duration_since(t) >= TTL) {
+        // mark stale; caller will refresh
+        c.at = Some(now);
+        c.v = None;
+    }
+    c.v.clone()
+}
+
+fn set_gpus(v: Option<Vec<crate::gpu::GpuMetrics>>) {
+    if let Some(lock) = GPUC.get() {
+        if let Ok(mut c) = lock.lock() {
+            c.v = v.clone();
+            c.at = Some(Instant::now());
+        }
+    }
+}
+
+// Collect only fast-changing metrics (CPU/mem/net + optional temps/gpus).
+pub async fn collect_fast_metrics(state: &AppState) -> Metrics {
     let mut sys = state.sys.lock().await;
-    // Simple and safe — can be replaced by more granular refresh if desired:
+    if let Err(e) = std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| {
-    // sys.refresh_cpu(); sys.refresh_memory(); sys.refresh_processes_specifics(...);
+        sys.refresh_cpu_usage();
-    //sys.refresh_all();
+        sys.refresh_memory();
-    //refresh all was found to use 2X CPU rather than individual refreshes
+    })) {
-    sys.refresh_cpu_all();
+        warn!("sysinfo selective refresh panicked: {e:?}");
-    sys.refresh_memory();
+    }
-    sys.refresh_processes(sysinfo::ProcessesToUpdate::All, true);
 
-    let hostname = System::host_name().unwrap_or_else(|| "unknown".into());
+    let hostname = System::host_name().unwrap_or_else(|| "unknown".to_string());
+    let cpu_total = sys.global_cpu_usage();
+    let cpu_per_core: Vec<f32> = sys.cpus().iter().map(|c| c.cpu_usage()).collect();
+    let mem_total = sys.total_memory();
+    let mem_used = mem_total.saturating_sub(sys.available_memory());
+    let swap_total = sys.total_swap();
+    let swap_used = sys.used_swap();
+    drop(sys);
 
-    // Temps via a persistent Components handle
+    // CPU temperature: only refresh sensors if cache is stale
-    let mut components = state.components.lock().await;
+    let cpu_temp_c = if cached_temp().is_some() {
-    components.refresh(true);
+        cached_temp()
-    let cpu_temp_c = best_cpu_temp(&components);
+    } else if temp_enabled() {
+        let val = {
+            let mut components = state.components.lock().await;
+            components.refresh(false);
+            components.iter().find_map(|c| {
+                let l = c.label().to_ascii_lowercase();
+                if l.contains("cpu")
+                    || l.contains("package")
+                    || l.contains("tctl")
+                    || l.contains("tdie")
+                {
+                    c.temperature()
+                } else {
+                    None
+                }
+            })
+        };
+        set_temp(val);
+        val
+    } else {
+        None
+    };
 
-    // Disks via a persistent Disks handle
+    // Networks
-    let mut disks_struct = state.disks.lock().await;
+    let networks: Vec<NetworkInfo> = {
-    disks_struct.refresh(true);
+        let mut nets = state.networks.lock().await;
-    // Filter anything with available == 0 (e.g., overlay/virtual)
+        nets.refresh(false);
-    let disks: Vec<DiskInfo> = disks_struct
+        nets.iter()
-        .list()
+            .map(|(name, data)| NetworkInfo {
+                name: name.to_string(),
+                received: data.total_received(),
+                transmitted: data.total_transmitted(),
+            })
+            .collect()
+    };
+
+    // GPUs: refresh only when cache is stale
+    let gpus = if cached_gpus().is_some() {
+        cached_gpus()
+    } else if gpu_enabled() {
+        let v = match collect_all_gpus() {
+            Ok(v) if !v.is_empty() => Some(v),
+            Ok(_) => None,
+            Err(e) => {
+                warn!("gpu collection failed: {e}");
+                None
+            }
+        };
+        set_gpus(v.clone());
+        v
+    } else {
+        None
+    };
+
+    Metrics {
+        cpu_total,
+        cpu_per_core,
+        mem_total,
+        mem_used,
+        swap_total,
+        swap_used,
+        hostname,
+        cpu_temp_c,
+        disks: Vec::new(),
+        networks,
+        top_processes: Vec::new(),
+        gpus,
+    }
+}
+
+// Cached disks
+pub async fn collect_disks(state: &AppState) -> Vec<DiskInfo> {
+    let mut disks_list = state.disks.lock().await;
+    disks_list.refresh(false); // don't drop missing disks
+    disks_list
         .iter()
-        .filter(|d| d.available_space() > 0)
         .map(|d| DiskInfo {
-            name: d.name().to_string_lossy().to_string(),
+            name: d.name().to_string_lossy().into_owned(),
             total: d.total_space(),
             available: d.available_space(),
         })
-        .collect();
+        .collect()
+}
 
-    // Networks: use a persistent Networks + rolling totals
+// Linux-only helpers and implementation using /proc deltas for accurate CPU%.
-    let mut nets = state.nets.lock().await;
+#[cfg(target_os = "linux")]
-    nets.refresh(true);
+#[inline]
-    let mut totals = state.net_totals.lock().await;
+fn read_total_jiffies() -> io::Result<u64> {
-    let mut networks: Vec<NetworkInfo> = Vec::new();
+    // /proc/stat first line: "cpu  user nice system idle iowait irq softirq steal ..."
-    for (name, data) in nets.iter() {
+    let s = fs::read_to_string("/proc/stat")?;
-        // sysinfo: received()/transmitted() are deltas since last refresh
+    if let Some(line) = s.lines().next() {
-        let delta_rx = data.received();
+        let mut it = line.split_whitespace();
-        let delta_tx = data.transmitted();
+        let _cpu = it.next(); // "cpu"
+        let mut sum: u64 = 0;
+        for tok in it.take(8) {
+            if let Ok(v) = tok.parse::<u64>() {
+                sum = sum.saturating_add(v);
+            }
+        }
+        return Ok(sum);
+    }
+    Err(io::Error::other("no cpu line"))
+}
 
-        let entry = totals.entry(name.clone()).or_insert((0, 0));
+#[cfg(target_os = "linux")]
-        entry.0 = entry.0.saturating_add(delta_rx);
+#[inline]
-        entry.1 = entry.1.saturating_add(delta_tx);
+fn read_proc_jiffies(pid: u32) -> Option<u64> {
+    let path = format!("/proc/{pid}/stat");
+    let s = fs::read_to_string(path).ok()?;
+    // Find the right parenthesis that terminates comm; everything after is space-separated fields starting at "state"
+    let rpar = s.rfind(')')?;
+    let after = s.get(rpar + 2..)?; // skip ") "
+    let mut it = after.split_whitespace();
+    // utime (14th field) is offset 11 from "state", stime (15th) is next
+    let utime = it.nth(11)?.parse::<u64>().ok()?;
+    let stime = it.next()?.parse::<u64>().ok()?;
+    Some(utime.saturating_add(stime))
+}
 
-        networks.push(NetworkInfo {
+/// Collect top processes (Linux variant): compute CPU% via /proc jiffies delta.
-            name: name.clone(),
+#[cfg(target_os = "linux")]
-            received: entry.0,
+pub async fn collect_processes_top_k(state: &AppState, k: usize) -> ProcessesPayload {
-            transmitted: entry.1,
+    // Fresh view to avoid lingering entries and select "no tasks" (no per-thread rows).
-        });
+    let mut sys = System::new();
+    sys.refresh_processes_specifics(
+        ProcessesToUpdate::All,
+        false,
+        ProcessRefreshKind::everything().without_tasks(),
+    );
+
+    let total_count = sys.processes().len();
+
+    // Snapshot current per-pid jiffies
+    let mut current: HashMap<u32, u64> = HashMap::with_capacity(total_count);
+    for p in sys.processes().values() {
+        let pid = p.pid().as_u32();
+        if let Some(j) = read_proc_jiffies(pid) {
+            current.insert(pid, j);
+        }
+    }
+    let total_now = read_total_jiffies().unwrap_or(0);
+
+    // Compute deltas vs last sample
+    let (last_total, mut last_map) = {
+        #[cfg(target_os = "linux")]
+        {
+            let mut t = state.proc_cpu.lock().await;
+            let lt = t.last_total;
+            let lm = std::mem::take(&mut t.last_per_pid);
+            t.last_total = total_now;
+            t.last_per_pid = current.clone();
+            (lt, lm)
+        }
+        #[cfg(not(target_os = "linux"))]
+        {
+            let _: u64 = total_now; // silence unused warning
+            (0u64, HashMap::new())
+        }
+    };
+
+    // On first run or if total delta is tiny, report zeros
+    if last_total == 0 || total_now <= last_total {
+        let procs: Vec<ProcessInfo> = sys
+            .processes()
+            .values()
+            .map(|p| ProcessInfo {
+                pid: p.pid().as_u32(),
+                name: p.name().to_string_lossy().into_owned(),
+                cpu_usage: 0.0,
+                mem_bytes: p.memory(),
+            })
+            .collect();
+        return ProcessesPayload {
+            process_count: total_count,
+            top_processes: top_k_sorted(procs, k),
+        };
     }
 
-    // Normalize process CPU to 0..100 across all cores
+    let dt = total_now.saturating_sub(last_total).max(1) as f32;
-    let n_cpus = sys.cpus().len().max(1) as f32;
+
+    let procs: Vec<ProcessInfo> = sys
+        .processes()
+        .values()
+        .map(|p| {
+            let pid = p.pid().as_u32();
+            let now = current.get(&pid).copied().unwrap_or(0);
+            let prev = last_map.remove(&pid).unwrap_or(0);
+            let du = now.saturating_sub(prev) as f32;
+            let cpu = ((du / dt) * 100.0).clamp(0.0, 100.0);
+            ProcessInfo {
+                pid,
+                name: p.name().to_string_lossy().into_owned(),
+                cpu_usage: cpu,
+                mem_bytes: p.memory(),
+            }
+        })
+        .collect();
+
+    ProcessesPayload {
+        process_count: total_count,
+        top_processes: top_k_sorted(procs, k),
+    }
+}
+
+/// Collect top processes (non-Linux): use sysinfo's internal CPU% by doing a double refresh.
+#[cfg(not(target_os = "linux"))]
+pub async fn collect_processes_top_k(state: &AppState, k: usize) -> ProcessesPayload {
+    use tokio::time::sleep;
+
+    let mut sys = state.sys.lock().await;
+
+    // First refresh to set baseline
+    sys.refresh_processes_specifics(
+        ProcessesToUpdate::All,
+        false,
+        ProcessRefreshKind::everything().without_tasks(),
+    );
+    // Small delay so sysinfo can compute CPU deltas on next refresh
+    sleep(Duration::from_millis(250)).await;
+    sys.refresh_processes_specifics(
+        ProcessesToUpdate::All,
+        false,
+        ProcessRefreshKind::everything().without_tasks(),
+    );
+
+    let total_count = sys.processes().len();
 
-    // Build process list
     let mut procs: Vec<ProcessInfo> = sys
         .processes()
         .values()
         .map(|p| ProcessInfo {
             pid: p.pid().as_u32(),
-            name: p.name().to_string_lossy().to_string(),
+            name: p.name().to_string_lossy().into_owned(),
-            cpu_usage: (p.cpu_usage() / n_cpus).min(100.0),
+            cpu_usage: p.cpu_usage(),
             mem_bytes: p.memory(),
         })
         .collect();
 
-    // Partial select: get the top 20 by CPU without fully sorting the vector
+    procs = top_k_sorted(procs, k);
-    const TOP_N: usize = 20;
+    ProcessesPayload {
-    if procs.len() > TOP_N {
+        process_count: total_count,
-        // nth index is TOP_N-1 (0-based)
-        let nth = TOP_N - 1;
-        procs.select_nth_unstable_by(nth, |a, b| {
-            b.cpu_usage
-                .partial_cmp(&a.cpu_usage)
-                .unwrap_or(std::cmp::Ordering::Equal)
-        });
-        procs.truncate(TOP_N);
-        // Order those 20 nicely for display
-        procs.sort_by(|a, b| {
-            b.cpu_usage
-                .partial_cmp(&a.cpu_usage)
-                .unwrap_or(std::cmp::Ordering::Equal)
-        });
-    } else {
-        procs.sort_by(|a, b| {
-            b.cpu_usage
-                .partial_cmp(&a.cpu_usage)
-                .unwrap_or(std::cmp::Ordering::Equal)
-        });
-    }
-
-    Metrics {
-        cpu_total: sys.global_cpu_usage(),
-        cpu_per_core: sys.cpus().iter().map(|c| c.cpu_usage()).collect(),
-        mem_total: sys.total_memory(),
-        mem_used: sys.used_memory(),
-        swap_total: sys.total_swap(),
-        swap_used: sys.used_swap(),
-        process_count: sys.processes().len(),
-        hostname,
-        cpu_temp_c,
-        disks,
-        networks,
         top_processes: procs,
     }
 }
 
-// Pick the hottest CPU-like sensor (labels vary by platform)
+// Small helper to select and sort top-k by cpu
-pub fn best_cpu_temp(components: &Components) -> Option<f32> {
+fn top_k_sorted(mut v: Vec<ProcessInfo>, k: usize) -> Vec<ProcessInfo> {
-    components
+    if v.len() > k {
-        .iter()
+        v.select_nth_unstable_by(k, |a, b| {
-        .filter(|c| {
+            b.cpu_usage
-            let label = c.label().to_lowercase();
+                .partial_cmp(&a.cpu_usage)
-            label.contains("cpu") || label.contains("package") || label.contains("tctl") || label.contains("tdie")
+                .unwrap_or(std::cmp::Ordering::Equal)
-        })
+        });
-        .filter_map(|c| c.temperature())
+        v.truncate(k);
-        .max_by(|a, b| a.partial_cmp(b).unwrap_or(std::cmp::Ordering::Equal))
+    }
-}
+    v.sort_by(|a, b| {
+        b.cpu_usage
+            .partial_cmp(&a.cpu_usage)
+            .unwrap_or(std::cmp::Ordering::Equal)
+    });
+    v
+}

socktop_agent/src/sampler.rs

@@ -1,36 +1,34 @@
-//! Background sampler: periodically collects metrics and updates a JSON cache,
+//! Background sampler: periodically collects metrics and updates precompressed caches,
-//! so WS replies are just a read of the cached string.
+//! so WS replies just read and send cached bytes.
 
-use crate::metrics::collect_metrics;
 use crate::state::AppState;
-//use serde_json::to_string;
 use tokio::task::JoinHandle;
-use tokio::time::{Duration, interval, MissedTickBehavior};
+use tokio::time::{sleep, Duration};
 
-pub fn spawn_sampler(state: AppState, period: Duration) -> JoinHandle<()> {
+// 500ms: fast path (cpu/mem/net/temp/gpu)
+pub fn spawn_sampler(_state: AppState, _period: Duration) -> JoinHandle<()> {
     tokio::spawn(async move {
-        let idle_period = Duration::from_secs(10);
+        // no-op background sampler (request-driven collection elsewhere)
         loop {
-            let active = state.client_count.load(std::sync::atomic::Ordering::Relaxed) > 0;
+            sleep(Duration::from_secs(3600)).await;
-            let mut ticker = interval(if active { period } else { idle_period });
-            ticker.set_missed_tick_behavior(MissedTickBehavior::Skip);
-            ticker.tick().await;
-
-            if !active {
-                tokio::select! {
-                    _ = ticker.tick() => {},
-                    _ = state.wake_sampler.notified() => continue,
-                }
-            }
-
-            if let Ok(json) = async {
-                let m = collect_metrics(&state).await;
-                serde_json::to_string(&m)
-            }
-            .await
-            {
-                *state.last_json.write().await = json;
-            }
         }
     })
-}
+}
+
+// 2s: processes top-k
+pub fn spawn_process_sampler(_state: AppState, _period: Duration, _top_k: usize) -> JoinHandle<()> {
+    tokio::spawn(async move {
+        loop {
+            sleep(Duration::from_secs(3600)).await;
+        }
+    })
+}
+
+// 5s: disks
+pub fn spawn_disks_sampler(_state: AppState, _period: Duration) -> JoinHandle<()> {
+    tokio::spawn(async move {
+        loop {
+            sleep(Duration::from_secs(3600)).await;
+        }
+    })
+}

socktop_agent/src/state.rs

@@ -1,30 +1,59 @@
 //! Shared agent state: sysinfo handles and hot JSON cache.
 
-use std::{collections::HashMap, sync::Arc};
+#[cfg(target_os = "linux")]
+use std::collections::HashMap;
 use std::sync::atomic::AtomicUsize;
+use std::sync::Arc;
 use sysinfo::{Components, Disks, Networks, System};
-use tokio::sync::{Mutex, RwLock, Notify};
+use tokio::sync::Mutex;
 
 pub type SharedSystem = Arc<Mutex<System>>;
-pub type SharedNetworks = Arc<Mutex<Networks>>;
-pub type SharedTotals = Arc<Mutex<HashMap<String, (u64, u64)>>>;
 pub type SharedComponents = Arc<Mutex<Components>>;
 pub type SharedDisks = Arc<Mutex<Disks>>;
+pub type SharedNetworks = Arc<Mutex<Networks>>;
+
+#[cfg(target_os = "linux")]
+#[derive(Default)]
+pub struct ProcCpuTracker {
+    pub last_total: u64,
+    pub last_per_pid: HashMap<u32, u64>,
+}
 
 #[derive(Clone)]
 pub struct AppState {
-    // Persistent sysinfo handles
     pub sys: SharedSystem,
-    pub nets: SharedNetworks,
-    pub net_totals: SharedTotals, // iface -> (rx_total, tx_total)
     pub components: SharedComponents,
     pub disks: SharedDisks,
+    pub networks: SharedNetworks,
 
-    // Last serialized JSON snapshot for fast WS responses
+    // For correct per-process CPU% using /proc deltas (Linux only path uses this tracker)
-    pub last_json: Arc<RwLock<String>>,
+    #[cfg(target_os = "linux")]
+    pub proc_cpu: Arc<Mutex<ProcCpuTracker>>,
 
-    // Adaptive sampling controls
+    // Connection tracking (to allow future idle sleeps if desired)
     pub client_count: Arc<AtomicUsize>,
-    pub wake_sampler: Arc<Notify>,
+
     pub auth_token: Option<String>,
-}
+}
+
+impl AppState {
+    pub fn new() -> Self {
+        let sys = System::new();
+        let components = Components::new_with_refreshed_list();
+        let disks = Disks::new_with_refreshed_list();
+        let networks = Networks::new_with_refreshed_list();
+
+        Self {
+            sys: Arc::new(Mutex::new(sys)),
+            components: Arc::new(Mutex::new(components)),
+            disks: Arc::new(Mutex::new(disks)),
+            networks: Arc::new(Mutex::new(networks)),
+            #[cfg(target_os = "linux")]
+            proc_cpu: Arc::new(Mutex::new(ProcCpuTracker::default())),
+            client_count: Arc::new(AtomicUsize::new(0)),
+            auth_token: std::env::var("SOCKTOP_TOKEN")
+                .ok()
+                .filter(|s| !s.is_empty()),
+        }
+    }
+}

socktop_agent/src/types.rs

@@ -1,9 +1,24 @@
 //! Data types sent to the client over WebSocket.
 //! Keep this module minimal and stable — it defines the wire format.
 
+use crate::gpu::GpuMetrics;
 use serde::Serialize;
 
-#[derive(Debug, Serialize, Clone)]
+#[derive(Debug, Clone, Serialize)]
+pub struct DiskInfo {
+    pub name: String,
+    pub total: u64,
+    pub available: u64,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct NetworkInfo {
+    pub name: String,
+    pub received: u64,
+    pub transmitted: u64,
+}
+
+#[derive(Debug, Clone, Serialize)]
 pub struct ProcessInfo {
     pub pid: u32,
     pub name: String,
@@ -11,22 +26,7 @@ pub struct ProcessInfo {
     pub mem_bytes: u64,
 }
 
-#[derive(Debug, Serialize, Clone)]
+#[derive(Debug, Clone, Serialize)]
-pub struct DiskInfo {
-    pub name: String,
-    pub total: u64,
-    pub available: u64,
-}
-
-#[derive(Debug, Serialize, Clone)]
-pub struct NetworkInfo {
-    pub name: String,
-    // cumulative totals since the agent started (client should diff to get rates)
-    pub received: u64,
-    pub transmitted: u64,
-}
-
-#[derive(Debug, Serialize, Clone)]
 pub struct Metrics {
     pub cpu_total: f32,
     pub cpu_per_core: Vec<f32>,
@@ -34,10 +34,16 @@ pub struct Metrics {
     pub mem_used: u64,
     pub swap_total: u64,
     pub swap_used: u64,
-    pub process_count: usize,
     pub hostname: String,
     pub cpu_temp_c: Option<f32>,
     pub disks: Vec<DiskInfo>,
     pub networks: Vec<NetworkInfo>,
     pub top_processes: Vec<ProcessInfo>,
-}
+    pub gpus: Option<Vec<GpuMetrics>>,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct ProcessesPayload {
+    pub process_count: usize,
+    pub top_processes: Vec<ProcessInfo>,
+}

socktop_agent/src/ws.rs

@@ -1,66 +1,69 @@
-//! WebSocket upgrade and per-connection handler. Serves cached JSON quickly.
+//! WebSocket upgrade and per-connection handler (request-driven).
 
 use axum::{
-    extract::{
+    extract::ws::{Message, WebSocket},
-        ws::{Message, WebSocket, WebSocketUpgrade},
+    extract::{Query, State, WebSocketUpgrade},
-        Query, State,
+    response::Response,
-    },
-    http::StatusCode,
-    response::{IntoResponse, Response},
 };
-use futures_util::stream::StreamExt;
+use flate2::{write::GzEncoder, Compression};
-
+use futures_util::StreamExt;
-use crate::metrics::collect_metrics;
-use crate::state::AppState;
-
 use std::collections::HashMap;
-use std::sync::atomic::Ordering;
+use std::io::Write;
+
+use crate::metrics::{collect_disks, collect_fast_metrics, collect_processes_top_k};
+use crate::state::AppState;
 
 pub async fn ws_handler(
     ws: WebSocketUpgrade,
     State(state): State<AppState>,
     Query(q): Query<HashMap<String, String>>,
 ) -> Response {
+    // optional auth
     if let Some(expected) = state.auth_token.as_ref() {
-        match q.get("token") {
+        if q.get("token") != Some(expected) {
-            Some(t) if t == expected => {}
+            return ws.on_upgrade(|socket| async move {
-            _ => return StatusCode::UNAUTHORIZED.into_response(),
+                let _ = socket.close().await;
+            });
         }
     }
     ws.on_upgrade(move |socket| handle_socket(socket, state))
 }
 
 async fn handle_socket(mut socket: WebSocket, state: AppState) {
-    // Bump client count on connect and wake the sampler.
+    state
-    state.client_count.fetch_add(1, Ordering::Relaxed);
+        .client_count
-    state.wake_sampler.notify_waiters();
+        .fetch_add(1, std::sync::atomic::Ordering::Relaxed);
-
-    // Ensure we decrement on disconnect (drop).
-    struct ClientGuard(AppState);
-    impl Drop for ClientGuard {
-        fn drop(&mut self) {
-            self.0.client_count.fetch_sub(1, Ordering::Relaxed);
-            self.0.wake_sampler.notify_waiters();
-        }
-    }
-    let _guard = ClientGuard(state.clone());
-
     while let Some(Ok(msg)) = socket.next().await {
         match msg {
-            Message::Text(text) if text == "get_metrics" => {
+            Message::Text(ref text) if text == "get_metrics" => {
-                // Serve the cached JSON quickly; if empty (cold start), collect once.
+                let m = collect_fast_metrics(&state).await;
-                let cached = state.last_json.read().await.clone();
+                let _ = send_json(&mut socket, &m).await;
-                if !cached.is_empty() {
+            }
-                    let _ = socket.send(Message::Text(cached)).await;
+            Message::Text(ref text) if text == "get_disks" => {
-                } else {
+                let d = collect_disks(&state).await;
-                    let metrics = collect_metrics(&state).await;
+                let _ = send_json(&mut socket, &d).await;
-                    if let Ok(js) = serde_json::to_string(&metrics) {
+            }
-                        let _ = socket.send(Message::Text(js)).await;
+            Message::Text(ref text) if text == "get_processes" => {
-                    }
+                let p = collect_processes_top_k(&state, 50).await;
-                }
+                let _ = send_json(&mut socket, &p).await;
             }
             Message::Close(_) => break,
             _ => {}
         }
     }
-}
+    state
+        .client_count
+        .fetch_sub(1, std::sync::atomic::Ordering::Relaxed);
+}
+
+// Small, cheap gzip for larger payloads; send text for small.
+async fn send_json<T: serde::Serialize>(ws: &mut WebSocket, value: &T) -> Result<(), axum::Error> {
+    let json = serde_json::to_string(value).expect("serialize");
+    if json.len() <= 768 {
+        return ws.send(Message::Text(json)).await;
+    }
+    let mut enc = GzEncoder::new(Vec::new(), Compression::fast());
+    enc.write_all(json.as_bytes()).ok();
+    let bin = enc.finish().unwrap_or_else(|_| json.into_bytes());
+    ws.send(Message::Binary(bin)).await
+}