benchmarks.yml

name: Benchmarks

# CodSpeed uses Valgrind to count CPU instructions.
# Valgrind wraps `hatch run` and traces child processes (hatch → uv → python → pytest).
# Do NOT skip hatch/uv in Valgrind args. Skipping a parent process causes Valgrind to lose track of ALL children (no data captured).
# See `benchmarks/README.md` for more information.

on:
  pull_request:
  push:
    branches: [main]

permissions:
  contents: read
  id-token: write

jobs:
  benchmark-fast:
    runs-on: ubuntu-latest
    timeout-minutes: 30

    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0  # Required for baseline comparison

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: "3.11"

      - name: Install hatch
        run: pip install hatch

      - name: Run benchmarks with CodSpeed
        uses: CodSpeedHQ/action@v4
        env:
          UV_NO_PROGRESS: "1"
        with:
          run: hatch run benchmark:run --codspeed -m "not slow"

      - name: Generate benchmark JSON (fallback)
        if: always()
        env:
          UV_NO_PROGRESS: "1"
        run: |
          hatch run benchmark:run \
            --benchmark-only \
            --benchmark-json=benchmark-results.json \
            -m "not slow" || true

      - name: Upload benchmark results
        uses: actions/upload-artifact@v4
        if: always()
        with:
          name: benchmark-results
          path: benchmark-results.json
          retention-days: 30