Establish performance baselines and regression detection - #3441
Establish performance baselines and regression detection#3441dheerajodha wants to merge 6 commits into
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Included review availability: Your plan provides up to 12 included reviews per hour; 11 remain after this review. 📝 WalkthroughWalkthroughThe PR adds stress benchmark baselines and thresholds, compares successful CI benchmark results against them, reports metric changes, and adds baseline regeneration commands and documentation. ChangesStress benchmark regression tracking
Estimated code review effort: 3 (Moderate) | ~30 minutes Merge Risk: ⚪ Minimal · up to The PR adds benchmark baselines and configurable CI regression checks; no actionable merge-blocking risk remains after normal checks and review. Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant GitHubActions
participant StressBenchmark
participant CompareScript
participant JobSummary
GitHubActions->>StressBenchmark: run stress benchmark
StressBenchmark-->>GitHubActions: return output and status
GitHubActions->>CompareScript: compare successful output with baseline
CompareScript-->>GitHubActions: return comparison status
GitHubActions->>JobSummary: publish benchmark and comparison metrics
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Docstring CoverageExplanation No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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Labels: PR updates documentation files (AGENTS.md, benchmark/README.md, SKILL.md) alongside benchmark infrastructure changes. Next steps:
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Labels: PR adds benchmark regression testing infrastructure (compare.sh, baseline.json, thresholds.json, CI integration). Next steps:
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Labels: PR adds a GitHub Actions workflow with command injection vulnerabilities in shell/Python interpolation Next steps:
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Labels: PR adds CI benchmark workflow and benchmark infrastructure Next steps:
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Actionable comments posted: 2
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Inline comments:
In `@benchmark/stress/compare.sh`:
- Around line 50-64: Update benchmark/stress/compare.sh lines 50-64 to read and
validate the current components and workers against baseline.json before
calculating metric changes. Update Makefile lines 203-219 to force the CI
workload when generating repository baselines or reject non-CI overrides. Update
.claude/skills/benchmark/SKILL.md lines 64-84 to require the CI workload before
running ./compare.sh.
In `@Makefile`:
- Around line 202-204: Update the benchmark recipe around the go run and tee
pipeline so failures from go run are preserved, using direct output capture or
Bash pipefail; ensure subsequent parsing and baseline.json updates do not
proceed from a failed benchmark run.
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Fix all unresolved CodeRabbit comments on this PR:
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.claude/skills/benchmark/SKILL.md.github/workflows/benchmark.yamlAGENTS.mdMakefilebenchmark/README.mdbenchmark/stress/baseline.jsonbenchmark/stress/compare.shbenchmark/stress/thresholds.json
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Force-pushed to get in a fix for the violations I was getting. |
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Add baseline.json with current benchmark metrics, thresholds.json with configurable regression limits (15% RSS, 20% time), and compare.sh to detect regressions. The CI workflow now compares results against the baseline and fails when thresholds are exceeded. Job summary shows current vs baseline with % change. A new `make benchmark_baseline` target regenerates the baseline from a local benchmark run. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Restore continue-on-error on the job so benchmarks inform but don't block merges - Add continue-on-error on the compare step so regressions are reported in the summary without failing the job - Replace stderr suppression (2>/dev/null) with capture to file in the Makefile baseline target - Fix default workers fallback from 35 to 10 in the Makefile - Update baseline with latest CI run measurements Resolves: EC-1819 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Replace grep -oP with python3 for macOS compatibility - Add validation for empty parsed metrics in compare.sh and Makefile - Remove continue-on-error from job and compare step so regressions fail the check; keep it on the bench run step for crash resilience - Rename execution_time_ns to ns_per_op for accuracy - Rename make target from benchmark_baseline to generate_baseline - Document baseline workflow in benchmark/README.md Resolves: EC-1819 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Pass benchmark output to Python via environment variables instead of interpolating into triple-quoted strings, preventing command injection if the benchmark binary emits crafted output. Skip baseline comparison when the benchmark step crashes to avoid conflating infrastructure failures with regressions. Guard against division by zero in baseline comparison. Rename generate_baseline to generate-baseline to match the Makefile's hyphenated naming convention. EC-1819 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Update AGENTS.md and the benchmark skill with stress benchmark make targets, baseline comparison workflow, and baseline regeneration. EC-1819 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Set EC_STRESS_COMPONENTS and EC_STRESS_WORKERS explicitly in the generate-baseline target so the baseline reflects the same workload CI uses (10/10). Add a note in the job summary when baseline comparison is skipped due to benchmark failure. Rename misleading awk variable names in the zero-value guard. EC-1819 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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| runs-on: ubuntu-latest | ||
| timeout-minutes: 15 | ||
| continue-on-error: true | ||
| env: |
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[medium] logic-error
Removing continue-on-error: true from the job level converts the benchmark from an advisory check into a blocking gate. With a single iteration and no statistical averaging or retry mechanism, noisy CI environments may produce false positive regressions that block PRs. The 15% RSS and 20% ns/op thresholds are reasonably generous but may not absorb CI-inherent variance in all cases.
| runs-on: ubuntu-latest | ||
| timeout-minutes: 15 | ||
| continue-on-error: true | ||
| env: |
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[low] scope-creep
The operational impact of converting the benchmark from advisory to blocking is not explicitly called out in the PR description. The PR title implies regression detection, but the enforcement posture change could surprise operators.
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| line=$(grep '^BenchmarkStress' "$BENCHMARK_OUTPUT" || true) | ||
| if [[ -z "$line" ]]; then | ||
| echo "No BenchmarkStress results found in output." |
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[low] edge-case
If the benchmark output contains multiple BenchmarkStress lines, grep captures all of them. Python's re.search finds the first match, silently discarding subsequent lines. Consider grep -m1 to be explicit about taking only the first match.
Suggested fix: Use grep -m1 '^BenchmarkStress' to explicitly take only the first match, and log a warning if multiple lines exist.
| echo "No BenchmarkStress results found in output." | ||
| exit 1 | ||
| fi | ||
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[low] error-handling-gap
If the python3 process substitution produces partial output, read could succeed with some variables empty, causing awk to silently treat them as 0. Adding a validation guard after read (checking all six variables are non-empty) would improve robustness.
Suggested fix: After the read command, add: [[ -n "$current_ns" && -n "$current_rss" && -n "$baseline_ns" && -n "$baseline_rss" && -n "$threshold_rss" && -n "$threshold_time" ]] || { echo 'Failed to parse metrics'; exit 1; }
| .PHONY: benchmark | ||
| benchmark: benchmark_simple ## Run benchmarks | ||
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| .PHONY: generate-baseline |
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[low] naming-convention
The target generate-baseline uses hyphens while existing benchmark targets use underscores (benchmark_data, benchmark_stress). Other Makefile targets use hyphens (lint-fix, tools-ci), so this is a minor inconsistency rather than a clear violation.
| alloc_mb=$(awk -v val="${alloc:-0}" 'BEGIN {printf "%.0f", val / 1048576}') | ||
| heap_mb=$(awk -v val="${heap:-0}" 'BEGIN {printf "%.0f", val / 1048576}') | ||
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| has_baseline=false |
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[low] error-handling-gap
The job summary's baseline comparison divides by bl_rss and bl_ns without a zero-value guard. compare.sh has this guard (line 69); the workflow summary code path does not.
| peak_rss=$(echo "$line" | grep -oP '[\d.]+ peak-RSS-bytes' | awk '{print $1}') | ||
| alloc=$(echo "$line" | grep -oP '[\d.]+ allocated-bytes/op' | awk '{print $1}') | ||
| heap=$(echo "$line" | grep -oP '[\d.]+ heap-bytes-from-system' | awk '{print $1}') | ||
| read -r ns_op peak_rss alloc heap < <(BENCH_LINE="$line" python3 -c " |
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[low] code-duplication
Benchmark output parsing (regex extraction of ns/op, peak-RSS-bytes) is duplicated across compare.sh, the workflow summary step, and the Makefile target. If the benchmark output format changes, all three must be updated.
| return m.group(1) if m else ''; \ | ||
| ns = val(r'([\d.]+)\s+ns/op'); rss = val(r'([\d.]+)\s+peak-RSS-bytes'); \ | ||
| (ns and rss) or sys.exit('Failed to parse benchmark metrics'); \ | ||
| json.dump({'peak_rss_bytes': int(float(rss)), 'ns_per_op': int(float(ns)), \ |
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[low] edge-case
The generate-baseline target embeds $(shell ...) expansions inside a Python string literal. Any unexpected character in the output (e.g., a single quote from a future Go version string) could break Python syntax. Consider passing these values via environment variables.
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What:
Store benchmark baselines in the repo and compare CI results against them. Fail the benchmark check when regressions exceed configurable thresholds.
Why:
EC-1818 added a report-only stress benchmark to CI. This follow-up closes the loop by detecting regressions automatically, without baselines and thresholds, the benchmark runs but nobody notices when performance degrades.
Tickets:
EC-1819