pwprof: Page Write Profiler

Profile page write access across time for Linux processes.

Features

• Track memory page writes using Linux soft-dirty bits
• Configurable sampling interval (default: 50ms)
• Visual heatmap with GitHub-style grid

Usage

1. Build

cmake -B build && make -C build

2. Collect Data

./build/pwprof output.txt [interval_ms] <command> [args...]

Examples:

# Default 50ms sampling
./build/pwprof data.txt ./my_program arg1 arg2

# Custom 100ms sampling  
./build/pwprof data.txt 100 ./my_program arg1 arg2

3. Visualize

1. Open visualization/index.html in a web browser
2. Load the generated data file
3. Click ▶ to watch memory access patterns