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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.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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Risk Assessment: moderate (2/5) DetailsAdditive CI/benchmark infrastructure PR: 8 files changed (289 lines), mostly new benchmark scripts and CI workflow updates. Touches 3 protected paths (.github/workflows, Makefile, AGENTS.md) and modifies CI workflows, but no production code is changed. All new files are benchmark tooling (compare.sh, baseline.json, thresholds.json). Risk is moderate given CI-only scope despite protected path count. |
| @cd benchmark/stress && \ | ||
| EC_STRESS_COMPONENTS=$${EC_STRESS_COMPONENTS:-10} EC_STRESS_WORKERS=$${EC_STRESS_WORKERS:-10} \ | ||
| go run . 2>benchmark-stderr.txt | tee benchmark-output.txt && \ | ||
| python3 -c "\ |
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[high] logic-error
The generate-baseline target passes a multi-line Python script to python3 -c via Make recipe line continuations. GNU Make replaces backslash-newline with a single space, collapsing the entire script onto one logical line. Python's def statement is a compound statement that cannot follow a semicolon — line = line[0]; def val(p): is a SyntaxError. This means make generate-baseline will always fail.
Suggested fix: Extract the Python to a separate script file (e.g., benchmark/stress/generate_baseline.py), or rewrite to avoid def by using inline lambda/expressions.
| runs-on: ubuntu-latest | ||
| timeout-minutes: 15 | ||
| continue-on-error: true | ||
| env: |
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[medium] CI-coverage-regression
The PR removes job-level continue-on-error and adds it only to the bench step. The new compare step does NOT have continue-on-error: true. A regression detected by compare.sh (exit non-zero) will now fail the overall PR check. Given CI runner variability (CPU contention, memory pressure), legitimate PRs could be blocked by noisy benchmark results.
Suggested fix: Add continue-on-error: true to the compare step, or keep job-level continue-on-error until the mechanism is proven stable.
| ./stress 2>benchmark-stderr.txt | tee benchmark-output.txt | ||
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| - name: Compare against baseline | ||
| id: compare |
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[low] error-handling-gap
The Compare against baseline step only runs when steps.bench.outcome == success. The Write job summary step handles the skipped state via if: always() and the steps.compare.outcome == skipped check. The interaction works correctly as designed.
| .PHONY: benchmark | ||
| benchmark: benchmark_simple ## Run benchmarks | ||
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| .PHONY: generate-baseline |
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[low] code-organization
The generate-baseline target contains an inline Python script spanning ~15 lines of continuation-escaped Make recipe, more complex than other inline logic in the Makefile. This is largely subsumed by the logic-error finding — extracting to a script resolves both issues.
Suggested fix: Extract the baseline-generation logic into a dedicated script (e.g., benchmark/stress/generate_baseline.py).
| 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-organization
Benchmark output parsing logic (regex extraction of ns/op, peak-RSS-bytes, etc.) is duplicated in three places: the workflow summary step, compare.sh, and the Makefile generate-baseline target. Each uses nearly identical regex patterns and extraction functions.
Suggested fix: Extract the parsing into a shared helper (e.g., benchmark/stress/parse.py) and call it from all three locations.
| echo "No BenchmarkStress results found in output." | ||
| exit 1 | ||
| fi | ||
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[low] edge-case
If the benchmark output contains multiple lines starting with BenchmarkStress (e.g., sub-benchmarks), grep returns all of them. Python re.search will match against the concatenated multi-line string, which may produce unexpected results.
Suggested fix: Use grep -m1 or pipe through head -1 to ensure only one line is processed.
| exit 1 | ||
| fi | ||
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| line=$(grep '^BenchmarkStress' "$BENCHMARK_OUTPUT" || true) |
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[low] error-handling-idiom
Error messages on lines 44 and 49 are written to stdout instead of stderr, inconsistent with the sibling push_data.sh and the embedded Python in the same script which write errors to stderr.
Suggested fix: Append >&2 to the echo statements on lines 44 and 49.
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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