rasusa 5.1.0

Randomly subsample reads or alignments
Documentation 
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on:
  pull_request:
    branches: [ main ]

name: Benchmark PR

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

permissions:
  contents: read
  pull-requests: write

env:
  CARGO_TERM_COLOR: always
  CARGO_INCREMENTAL: 0

jobs:
  bench-compare:
    name: Compare wall time / peak RSS vs main
    runs-on: ubuntu-latest
    steps:
      - name: Checkout sources
        uses: actions/checkout@v7
        with:
          fetch-depth: 0

      - name: Install toolchain
        uses: dtolnay/rust-toolchain@stable

      - uses: actions/cache@v6
        with:
          path: |
            ~/.cargo/registry/index/
            ~/.cargo/registry/cache/
            ~/.cargo/git/db/
            target/
          key: ${{ runner.os }}-cargo-bench-${{ hashFiles('**/Cargo.lock') }}
          restore-keys: |
            ${{ runner.os }}-cargo-bench-
            ${{ runner.os }}-cargo-

      - uses: taiki-e/install-action@v2
        with:
          tool: hyperfine

      - name: Install GNU time (peak RSS measurement)
        run: sudo apt-get update && sudo apt-get install -y time

      # This is a non-blocking, informational check: `bench.sh compare` exits non-zero
      # when a scenario regresses past its threshold, but `continue-on-error` keeps that
      # from failing the PR - see benches/README.md for why this is intentionally
      # advisory rather than a hard gate.
      - name: Compare current branch against main
        id: bench
        continue-on-error: true
        run: benches/bench.sh compare origin/main | tee bench-compare.txt

      - name: Render comparison markdown
        if: always()
        env:
          README_URL: ${{ github.server_url }}/${{ github.repository }}/blob/main/benches/README.md
        run: |
          {
            echo "### Benchmark comparison vs \`origin/main\`"
            echo
            echo "Wall time / peak RSS, ratio = head / base. Informational only - see [benches/README.md]($README_URL)."
            echo
            echo '```'
            cat bench-compare.txt 2>/dev/null || echo "(no output captured)"
            echo '```'
          } | tee bench-comment.md >> "$GITHUB_STEP_SUMMARY"

      - name: Post comparison as PR comment
        if: always()
        uses: marocchino/sticky-pull-request-comment@v3
        with:
          header: benchmark-comparison
          path: bench-comment.md