6287
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Ran 22 Aug 2026 06:34AM UTC

Jobs 1

Files 452

Run time 1min

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Committed 22 Aug 2026 06:31AM UTC coverage: 90.873% (+0.005%) from 90.868%

Build # 6287

Build Type

push

github

Committed by

bobzhang

Commit Message

bench(hashmap): isolate removal by copying a prebuilt map

The removal benchmark rebuilt the 50000-entry map inside the timed
closure, so it measured insertion and growth as well -- and insertion is
one of the paths this branch optimizes, which makes the number
unattributable. Copilot and Codex both flagged it.

`@bench.T` has no per-iteration setup hook, so the map still has to be
produced inside the closure. Copying a prebuilt one is a single pass over
the table rather than 50000 hash-and-probe insertions: about 0.86 ms
against the 2.4 ms a rebuild costs on js. A companion benchmark times the
copy alone, so removal can be read off by difference.

On js that gives removal 875 us on `main` against 690 us here, 21%
faster -- an attributable figure, where the combined benchmark could only
say that a mixed workload improved. The `set+remove` benchmark stays,
named for what it measures.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Coverage Stats

16757 of 18440 relevant lines covered (90.87%)

306599.69 hits per line

Jobs

ID	Job ID	Ran	Files	Coverage
1	6287.1	22 Aug 2026 06:34AM UTC	453	90.89	GitHub Action Run

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