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Mocks

multiprocess-profiling

The profiler-worker.mjs script demonstrates multiprocess profiling by spawning N child processes that perform work and generate performance traces.

Expected Output

Console:

  • JSON object containing profiler statistics (profiler state, shard info, queue stats, etc.)

Files:

  • A timestamped directory in CP_PROFILER_OUT_DIR (e.g., 20260131-210017-052/)
    • trace.<timestamp>.<pid>.<shard>.jsonl - WAL format trace files (one per process)
    • trace.<timestamp>.json - Consolidated trace file in Chrome DevTools format

Usage

CP_PROFILING=true DEBUG=true CP_PROFILER_OUT_DIR=/path/to/output npx tsx packages/utils/mocks/multiprocess-profiling/profiler-worker.mjs <numProcesses>

Example:

 CP_PROFILING=true DEBUG=true CP_PROFILER_OUT_DIR=./tmp/int/utils npx tsx --tsconfig tsconfig.base.json packages/utils/mocks/multiprocess-profiling/profiler-worker.mjs 3