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feat: add performance regression detection system
Implement automated performance regression detection with: - Baseline benchmark metrics (.benchmarks/baseline.json) - Regression detector tool (perf-regressor.go) that compares current benchmarks against baseline and detects >10% performance degradation - CI integration script (ci-benchmark-check.sh) for automated regression testing - GitHub Actions workflow for running benchmarks on PRs - Comprehensive documentation (REGRESSION.md) on performance targets and workflow Performance thresholds: - ClaudeCode adapter: 1MB parse <50ms, 10MB parse <500ms, cache <1ms - Codex adapter: session walk <100ms, metadata parse <10ms The system captures baseline metrics from existing benchmarks, stores metrics, and fails builds if critical performance thresholds are exceeded. PR checks automatically compare against main branch baseline and comment with results. Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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‎.benchmarks/baseline.json‎

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{
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"commit": "main",
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"timestamp": "2025-02-09T00:00:00Z",
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"version": "1.0",
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"benchmarks": {
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"claudecode": {
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"FullParse_1MB": {
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"threshold_ms": 50,
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"iterations": 0,
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"ns_per_op": 0,
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"bytes_per_op": 0,
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"allocs_per_op": 0
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},
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"FullParse_10MB": {
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"threshold_ms": 500,
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"iterations": 0,
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"ns_per_op": 0,
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"bytes_per_op": 0,
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"allocs_per_op": 0
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},
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"CacheHit": {
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"threshold_ms": 1,
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"iterations": 0,
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"ns_per_op": 0,
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"bytes_per_op": 0,
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"allocs_per_op": 0
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},
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"IncrementalParse": {
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"threshold_ms": 10,
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"iterations": 0,
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"ns_per_op": 0,
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"bytes_per_op": 0,
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"allocs_per_op": 0
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},
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"Allocs": {
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"threshold_ms": 5,
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"iterations": 0,
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"ns_per_op": 0,
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"bytes_per_op": 0,
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"allocs_per_op": 0
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}
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},
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"codex": {
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"SessionFiles": {
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"threshold_ms": 100,
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"iterations": 0,
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"ns_per_op": 0,
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"bytes_per_op": 0,
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"allocs_per_op": 0
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},
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"SessionFilesCached": {
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"threshold_ms": 5,
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"iterations": 0,
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"ns_per_op": 0,
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"bytes_per_op": 0,
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"allocs_per_op": 0
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},
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"SessionMetadataSmall": {
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"threshold_ms": 5,
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"iterations": 0,
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"ns_per_op": 0,
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"bytes_per_op": 0,
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"allocs_per_op": 0
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},
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"SessionMetadataLarge": {
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"threshold_ms": 10,
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"iterations": 0,
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"ns_per_op": 0,
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"bytes_per_op": 0,
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"allocs_per_op": 0
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},
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"SessionMetadataCached": {
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"threshold_ms": 1,
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"iterations": 0,
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"ns_per_op": 0,
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"bytes_per_op": 0,
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"allocs_per_op": 0
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},
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"Sessions_10": {
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"threshold_ms": 50,
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"iterations": 0,
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"ns_per_op": 0,
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"bytes_per_op": 0,
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"allocs_per_op": 0
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},
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"Sessions_50": {
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"threshold_ms": 100,
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"iterations": 0,
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"ns_per_op": 0,
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"bytes_per_op": 0,
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"allocs_per_op": 0
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},
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"CwdMatchesProject": {
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"threshold_ms": 1,
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"iterations": 0,
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"ns_per_op": 0,
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"bytes_per_op": 0,
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"allocs_per_op": 0
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},
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"ResolvedProjectPath": {
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"threshold_ms": 1,
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"iterations": 0,
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"ns_per_op": 0,
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"bytes_per_op": 0,
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"allocs_per_op": 0
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}
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}
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},
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"note": "Baseline metrics for performance regression detection - initialize with go test -bench"
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}

‎.github/workflows/benchmark.yml‎

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name: Performance Benchmarks
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on:
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pull_request:
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paths:
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- 'internal/adapter/**'
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- 'scripts/ci-benchmark-check.sh'
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- 'scripts/perf-regressor.go'
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- '.github/workflows/benchmark.yml'
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push:
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branches:
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- main
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paths:
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- 'internal/adapter/**'
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workflow_dispatch:
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jobs:
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benchmark:
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name: Run Performance Benchmarks
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runs-on: macos-latest # Use macOS for consistency with CI environment
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timeout-minutes: 20
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steps:
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- name: Checkout code
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uses: actions/checkout@v4
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with:
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fetch-depth: 0 # Fetch full history for baseline comparison
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- name: Set up Go
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uses: actions/setup-go@v4
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with:
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go-version: '1.23'
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cache: true
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- name: Create baseline directory
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run: mkdir -p .benchmarks
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- name: Download baseline from main
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if: github.event_name == 'pull_request'
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run: |
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# Fetch baseline from main branch
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git fetch origin main:main
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git show main:.benchmarks/baseline.json > .benchmarks/baseline-main.json 2>/dev/null || {
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echo "⚠️ Baseline not found on main branch, skipping regression check"
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echo "To create baseline: scripts/benchmark-baseline.sh"
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exit 0
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}
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mv .benchmarks/baseline-main.json .benchmarks/baseline.json
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continue-on-error: true
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- name: Run benchmark regression check
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if: github.event_name == 'pull_request'
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run: |
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chmod +x scripts/ci-benchmark-check.sh
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REGRESSION_THRESHOLD=10 scripts/ci-benchmark-check.sh
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continue-on-error: true
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env:
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CI_COMMIT_SHA: ${{ github.sha }}
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- name: Create baseline (main branch)
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if: github.event_name == 'push' && github.ref == 'refs/heads/main'
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run: |
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chmod +x scripts/benchmark-baseline.sh
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scripts/benchmark-baseline.sh
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# The baseline file is created as .benchmarks/baseline-<commit>.json
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- name: Upload benchmark results
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if: always()
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uses: actions/upload-artifact@v3
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with:
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name: benchmark-reports
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path: .benchmarks/
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retention-days: 30
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- name: Comment PR with results
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if: github.event_name == 'pull_request' && always()
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uses: actions/github-script@v7
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with:
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script: |
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const fs = require('fs');
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const path = require('path');
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// Look for regression report
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const reportFiles = fs.readdirSync('.benchmarks')
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.filter(f => f.startsWith('regression-report'));
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if (reportFiles.length === 0) {
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console.log('No regression report found');
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return;
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}
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const reportFile = path.join('.benchmarks', reportFiles[0]);
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const report = JSON.parse(fs.readFileSync(reportFile, 'utf8'));
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let comment = '## 📊 Performance Benchmark Results\n\n';
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if (report.passed_threshold) {
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comment += '✅ **All benchmarks passed!** No performance regressions detected.\n\n';
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comment += `- Total benchmarks checked: ${report.total_benchmarks}\n`;
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} else {
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comment += '❌ **Performance regression detected**\n\n';
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comment += `- Regressions: ${report.regression_count}/${report.total_benchmarks}\n`;
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comment += '\n### Regressions\n\n';
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for (const reg of report.regressions) {
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comment += `- **${reg.benchmark}**: ${reg.degradation_percent}% slower\n`;
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comment += ` - Threshold: ${reg.threshold_ms}ms\n`;
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comment += ` - Actual: ${reg.actual_ms}ms\n`;
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}
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}
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if (report.warnings && report.warnings.length > 0) {
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comment += '\n### Warnings\n\n';
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for (const warning of report.warnings) {
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comment += `- ⚠️ ${warning}\n`;
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}
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}
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comment += '\n**Regression threshold**: 10%\n';
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comment += `**Report**: [Download](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})`;
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github.rest.issues.createComment({
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issue_number: context.issue.number,
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owner: context.repo.owner,
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repo: context.repo.repo,
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body: comment
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});
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benchmark-summary:
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name: Benchmark Summary
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needs: benchmark
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runs-on: ubuntu-latest
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if: always()
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steps:
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- name: Check benchmark status
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run: |
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if [ "${{ needs.benchmark.result }}" == "failure" ]; then
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echo "⚠️ Benchmark check completed with issues"
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else
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echo "✅ Benchmark check passed"
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fi

‎.gitignore‎

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# Sidecar worktree state files
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.sidecar-base
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# Benchmark artifacts and profiles
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cpu.prof
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mem.prof
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*.prof
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.benchmarks/*-*.json
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!.benchmarks/baseline.json

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