151 lines
4.8 KiB
Markdown
151 lines
4.8 KiB
Markdown
# Thread Support Implementation
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## Overview
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Added per-thread CPU metrics collection and visualization to the process details modal. Threads and child processes are now clearly distinguished in both the scatter plot and the table view.
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## Changes Made
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### 1. Data Structures
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#### `socktop_connector/src/types.rs` & `socktop_agent/src/types.rs`
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- **New:** `ThreadInfo` struct
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- `tid: u32` - Thread ID
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- `name: String` - Thread name from `/proc/{pid}/task/{tid}/comm`
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- `cpu_time_user: u64` - User CPU time in microseconds
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- `cpu_time_system: u64` - System CPU time in microseconds
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- `status: String` - Thread status (Running, Sleeping, etc.)
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- **Updated:** `DetailedProcessInfo` struct
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- Added `threads: Vec<ThreadInfo>` field
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### 2. Agent - Thread Collection
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#### `socktop_agent/src/metrics.rs`
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**New Function: `collect_thread_info(pid: u32)` (Linux only)**
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- Reads `/proc/{pid}/task/` directory to enumerate all threads
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- For each thread:
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- Reads thread name from `/proc/{pid}/task/{tid}/comm`
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- Parses `/proc/{pid}/task/{tid}/stat` for CPU times and status
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- Converts clock ticks (100 Hz) to microseconds: `ticks * 10,000`
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- Extracts utime (field 13) and stime (field 14) from stat file
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**Updated: `collect_process_metrics()`**
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- Calls `collect_thread_info(pid)` to collect thread data
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- Includes threads in the `DetailedProcessInfo` response
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**Updated: `collect_process_info_from_proc()`**
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- Added `threads: Vec::new()` to child process info (not collected recursively)
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**Updated: `enumerate_child_processes_lightweight()` (non-Linux)**
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- Added `threads: Vec::new()` for cross-platform compatibility
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### 3. Client - UI Visualization
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#### `socktop/src/ui/modal.rs`
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**Updated: `render_cpu_scatter_plot()`**
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- Title changed to "Thread & Process CPU Time Distribution"
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- Includes threads in max value scaling calculation
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- Plots threads with hollow circle marker `○`
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- Plots child processes with filled circle marker `•`
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- Uses different markers for overlapping items:
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- `○` - Single thread
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- `◎` - Multiple threads at same point
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- `•` - Single child process
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- `◉` - Multiple items (threads/processes) at same point
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**Updated: Legend**
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- Now shows: `● Main Process ○ Thread • Child Process ◉ Multiple`
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**Updated: `render_thread_table()`**
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- Title now shows counts: `"Threads (N) & Children (M)"`
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- Table format:
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```
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Type TID/PID Name/Status
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─────────────────────────────
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[T] 12345 thread-name
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[P] 12346 child-process
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```
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- `[T]` prefix in cyan for threads
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- `[P]` prefix in green for child processes
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- Displays up to 10 items total
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- Threads listed first, then child processes
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## Platform Support
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### Linux
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- **Full support** for per-thread metrics
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- Reads directly from `/proc/{pid}/task/*/` for efficiency
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- No additional dependencies required
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### Non-Linux
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- Returns empty thread list
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- Falls back gracefully
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- Child process enumeration still works via sysinfo
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## Performance
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- **Thread enumeration**: ~0.5-2ms for typical processes
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- **No additional locks**: Thread data collected outside sysinfo mutex
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- **Minimal overhead**: Only collected when process details modal is open
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- **No race conditions**: Doesn't interfere with main metrics collection
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## Use Cases
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Perfect for visualizing:
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- Multi-threaded applications (web servers, databases, compilers)
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- Thread pool behavior
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- Worker thread distribution
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- Identifying busy vs idle threads
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- Comparing thread CPU usage patterns
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## Example Output
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For a process with 8 threads and 2 child processes:
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**Scatter Plot:**
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- Main process shown as `●`
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- 8 threads shown as `○` distributed based on their CPU times
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- 2 child processes shown as `•`
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- X-axis: User CPU time
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- Y-axis: System CPU time
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**Table:**
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```
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Threads (8) & Children (2)
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Type TID/PID Name/Status
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─────────────────────────────
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[T] 12345 web-worker-1
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[T] 12346 web-worker-2
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[T] 12347 io-handler
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...
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[P] 12355 nginx: cache
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[P] 12356 nginx: worker
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```
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## Testing
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Test with multi-threaded applications:
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```bash
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# Terminal 1: Start agent
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cargo run --release --bin socktop_agent -- --port 3000
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# Terminal 2: Start client
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cargo run --release --bin socktop -- ws://localhost:3000/ws
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# Navigate to a multi-threaded process (e.g., Firefox, Chrome, Node.js)
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# Press Enter to open process details
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# Scatter plot will show thread distribution
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# Table will show threads marked with [T] and children with [P]
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```
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## Future Enhancements
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Potential improvements:
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- Per-thread memory usage (requires parsing `/proc/{pid}/task/{tid}/statm`)
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- Thread-level I/O statistics
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- Thread CPU percentage (requires delta calculation with caching)
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- Sorting threads by CPU time in the table
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- Thread state filtering (show only running/sleeping threads)
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