perf_hooks: add statistical hypothesis testing to histogram - #65416
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jasnell wants to merge 2 commits into
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perf_hooks: add statistical hypothesis testing to histogram#65416jasnell wants to merge 2 commits into
jasnell wants to merge 2 commits into
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Welch's t-test, Mann-Whitney U test, Cohen's d, and Cliff's delta, and and handful of others These methods enable in-process benchmark comparison and regression detection without external dependencies. No new dependencies. Tests and docs created by the AI agent. Signed-off-by: James M Snell <jasnell@gmail.com> Assisted-by: Opencode/Opus
Add an --analyze flag that performs statistical analysis directly
after benchmarks complete, eliminating the need for R and compare.R.
When --analyze is specified, compare.js collects the rate data during
the run and prints a statistical summary table instead of CSV output.
The table matches the format of compare.R: improvement percentage,
significance stars (* p<0.05, ** p<0.01, *** p<0.001), and confidence
intervals at three risk levels.
Also adds a --max-regression N option that causes the compare.js to
exit with 1 (error) when the `--new` is N% slower. Useful for CI
use to detect regressions.
Uses the histogram API's welchTest() and cohensD() methods introduced
in the previous commit. Benchmark rates are scaled to integers for
HdrHistogram recording; the --scale option (default 1000) controls
the multiplier for precision.
Usage:
node benchmark/compare.js --old ./node-old --new ./node-new \
--analyze url
Signed-off-by: James M Snell <jasnell@gmail.com>
Assisted-by: Opencode/Opus
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Continue expanding the capabilities of the
HistogramAPI... and use it to enable a dependency-freebenchmark/compare.jsoption... i.e. no longer requiring R-script to show benchmark analysis... just runbenchmark/compare.jswith the--analyzeoption.Just scratching an old itch I've been wanting since I added
Histogramback in v11/cc @mcollina