feat(ci): G3 perf regression gate + allowlist governance docs#293
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- G3 gate now compares criterion bencher output against git-tracked perf-baseline.json, failing on >15% regression (configurable). - New perf-baseline-update.yml workflow auto-generates baseline update PRs on main pushes that touch Rust sources. - Added check_perf_regression.cjs (gate) and generate_perf_baseline.cjs (baseline generation from bencher output). - Added "Determinism Allowlist Governance" section to RELEASE_POLICY.md documenting exemption criteria, approval requirements, and audit cadence. - Added cross-reference from ban-nondeterminism.sh to governance policy. Closes #280 Closes #287
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| for (const name of benchNames) { |
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Iterating only Object.keys(current) means the gate never checks benchmarks that exist in perf-baseline.json but are missing from the new output, so a renamed/removed benchmark can silently bypass regression enforcement and still report G3: PASSED. This undermines the accuracy of the regression gate in exactly the cases where benchmark coverage changes, so the comparison should include baseline-only entries (at least as a hard failure or explicit review-required state).
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- Add step id to "Generate baseline JSON" and wire skip output into "Create baseline PR" if-condition (was dead GITHUB_OUTPUT write). - Add date prefix to baseline branch name to avoid short-SHA collisions. - Remove redundant git-diff guard (now handled by step skip logic). - Warn when baseline benchmarks are missing from current criterion run. - Remove unused path import from check_perf_regression.cjs.
… run Promote missing-benchmark detection from WARN to FAIL. A benchmark that exists in perf-baseline.json but is absent from the current criterion output now counts as a regression, preventing silent bypass via benchmark renames or removals. Resolution: update perf-baseline.json to remove the stale entry. Addresses chatgpt-codex-connector review comment on PR #293.
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Fixed in 6c039da: Missing benchmarks now fail G3 gate instead of warn-only. A benchmark present in |
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Summary
perf-baseline.jsonwith a configurable regression threshold (default 15%). Structuredperf-report.jsonartifact uploaded alongside rawperf.log. A separateperf-baseline-update.ymlworkflow auto-generates baseline update PRs on main pushes that touch Rust sources.docs/RELEASE_POLICY.mddocumenting when exemptions are acceptable, approval requirements, and audit cadence. Cross-referenced fromban-nondeterminism.shheader.New files
scripts/check_perf_regression.cjsscripts/generate_perf_baseline.cjsperf-baseline.jsonfrom criterion bencher output.github/workflows/perf-baseline-update.ymlperf-baseline.jsonTest plan
check_perf_regression.cjsexits 0 with empty baseline (first-run behavior)Closes #280
Closes #287