feat(scripts): bench-ab.sh — one-command local perf A/B#654
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Wraps the recipe used for every perf PR this cycle: build the base ref in a throwaway $HOME worktree (tests/bench misbehave under /tmp roots), run `zig build bench -- --json` for base and working tree back-to-back on the same machine, and print the same compare-bench.py table CI posts on PRs. Defaults to base=HEAD so uncommitted perf work is one command away from a trustworthy same-machine delta. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Benchmark Regression ReportThresholds: 10.00% and 50,000 ns absolute delta
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Jul 5, 2026
Bump semver + npm to 0.2.5828 and round out the changelog entry with the six commits that landed after the draft was written: searchSymbols binary-insert + total-order tiebreak (#647, #649), word-index persist integer remap + chunked writes (#650), call-graph reverse adjacency precompute (#651), snapshot dual-write clone (#652), ranked-search line-offset resolution (#653), and scripts/bench-ab.sh (#654). No code changes beyond the version strings + CHANGELOG. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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The "way to compare" for perf work:
scripts/bench-ab.sh [base-ref]builds the base in a throwaway $HOME worktree, benches base and the current working tree back-to-back on the same machine, and prints the exact CI regression table (compare-bench.py, 10% + 50µs thresholds). Default base isHEAD, so measuring uncommitted work is one command. Same-machine-same-run only — the header says so, because cross-day/cross-box JSON comparisons mislead (we hit exactly that this cycle).🤖 Generated with Claude Code