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ci: add benchmark job with regression warnings #19

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ci: add benchmark job with regression warnings
claude Jan 18, 2026
64016a3
ci: disable auto-push to gh-pages for benchmarks
claude Jan 18, 2026
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39 changes: 37 additions & 2 deletions .github/workflows/nix.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -76,15 +76,50 @@ jobs:
exit 1
fi

benchmark:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4

- name: Install Nix
uses: DeterminateSystems/nix-installer-action@v21

- name: Setup Nix cache
uses: DeterminateSystems/magic-nix-cache-action@v13
with:
use-flakehub: false

- name: Run benchmarks
run: nix develop --command cargo bench -- --noplot --output-format bencher | tee benchmark-results.txt

- name: Store benchmark result
uses: benchmark-action/github-action-benchmark@v1
with:
name: Rust Benchmarks
tool: 'cargo'
output-file-path: benchmark-results.txt
github-token: ${{ secrets.GITHUB_TOKEN }}
# Comment on PRs with benchmark comparison
comment-on-alert: true
# Warn if performance regresses by more than 10%
alert-threshold: '110%'
# Fail the workflow if performance regresses by more than 20%
fail-on-alert: true
fail-threshold: '120%'
# Disable auto-push (requires gh-pages branch setup)
auto-push: false
# Compare against previous results
comment-always: true

# Final job that depends on all other jobs - use this in branch protection rules
ci-success:
runs-on: ubuntu-latest
needs: [build-and-test, fuzz, codegen]
needs: [build-and-test, fuzz, codegen, benchmark]
if: always()
steps:
- name: Check all jobs passed
run: |
if [[ "${{ needs.build-and-test.result }}" != "success" || "${{ needs.fuzz.result }}" != "success" || "${{ needs.codegen.result }}" != "success" ]]; then
if [[ "${{ needs.build-and-test.result }}" != "success" || "${{ needs.fuzz.result }}" != "success" || "${{ needs.codegen.result }}" != "success" || "${{ needs.benchmark.result }}" != "success" ]]; then
echo "One or more jobs failed"
exit 1
fi
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