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71 lines
2.1 KiB
Markdown
71 lines
2.1 KiB
Markdown
# Trace Time Window
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## Overview
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This example creates a workload with mixed execution patterns to demonstrate time-windowed trace analysis. Five outer functions (`outer_a` through `outer_e`) each call an `inner()` function that alternates between CPU-bound busy-wait loops and sleep-based waiting - every 5th call does a CPU spin instead of sleeping. This creates distinct timing signatures in the trace, making it useful for testing profiling tools' ability to capture and distinguish between CPU-active and idle time windows within the same call graph.
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## Source Files
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- `trace-time-window.cpp` - Defines `inner()` with conditional CPU-bound vs. sleep behavior, and five `outer_*()` wrapper functions (generated via macro) that each call `inner(500)` with a 500 ms duration. All functions are marked `noinline`.
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## Prerequisites
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- CMake 3.25+
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- C++ compiler
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## Building
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**Standalone build:**
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```bash
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cmake -B <build_dir> -S <project_root>/examples/trace-time-window
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cmake --build <build_dir>
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```
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**As part of the examples suite:**
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```bash
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cmake -B <build_dir> -S <project_root>/examples/
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cmake --build <build_dir> --target trace-time-window
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```
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**NOTE**: The target is built in Debug mode to preserve the full call chain.
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## Running
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```bash
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# Default: 1 iteration (5 outer calls)
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./trace-time-window
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# Custom: 3 iterations (15 outer calls)
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./trace-time-window 3
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```
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**Arguments:**
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| Position | Description | Default |
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| ---------- | ------------- | --------- |
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| 1 | Number of repeat iterations | 1 |
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## Profiling with rocprofiler-systems
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```bash
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rocprof-sys-run -- ./trace-time-window 2
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```
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### Recommended Configuration
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| Variable | Value | Purpose |
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| ---------- | ------- | --------- |
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| `ROCPROFSYS_TRACE` | `true` | Generate Perfetto trace for timeline visualization |
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| `ROCPROFSYS_PROFILE` | `true` | Generate call-stack profile |
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| `ROCPROFSYS_VERBOSE` | `2` | Verbose output for debugging trace windows |
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| `ROCPROFSYS_LOG_LEVEL` | `trace` | Detailed log output |
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```bash
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rocprof-sys-run \
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-e ROCPROFSYS_TRACE=true \
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-e ROCPROFSYS_VERBOSE=2 \
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-- ./trace-time-window 2
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```
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