clerk @ b457e3f78e8397f82f727c2e5d4e335a0d32c9b1

name: benchmarks

on:

  push:

    branches: [master]

  pull_request:

  workflow_dispatch:

concurrency:

  group: benchmarks-${{ github.ref }}

  cancel-in-progress: true

permissions:

  contents: read

jobs:

  bench:

    runs-on: ubuntu-latest

    timeout-minutes: 30

    steps:

      - uses: actions/checkout@v5

      - uses: actions/setup-go@v6

        with:

          go-version-file: go.mod

      - name: Install benchstat

        run: |

          go install golang.org/x/perf/cmd/benchstat@latest

          echo "$(go env GOPATH)/bin" >> "$GITHUB_PATH"

      - name: Run benchmarks

        run: go test -bench . -benchmem -run '^$' -count=10 -benchtime=200x ./... > bench.txt 2>&1

      - name: Print benchmark numbers

        run: benchstat bench.txt

      - name: Restore baseline

        id: baseline

        uses: actions/cache/restore@v5

        with:

          path: bench-baseline.txt

          key: bench-${{ runner.os }}-${{ github.sha }}

          restore-keys: bench-${{ runner.os }}-

      - name: Print comparison

        if: steps.baseline.outputs.cache-hit == 'true'

        run: benchstat bench-baseline.txt bench.txt

      - name: Check for regressions

        if: steps.baseline.outputs.cache-hit == 'true'

        run: |

          benchstat -format csv bench-baseline.txt bench.txt 2>/dev/null | \

            python3 .github/scripts/check-bench-regression.py

      - name: Save baseline

        if: github.ref == 'refs/heads/master'

        uses: actions/cache/save@v5

        with:

          path: bench.txt

          key: bench-${{ runner.os }}-${{ github.sha }}