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Fix remaining flaky CodSpeed microbenchmarks#8861

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connortsui20 merged 3 commits into
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claude/codspeed-flaky-benchmarks-4vapbm
Jul 20, 2026
Merged

Fix remaining flaky CodSpeed microbenchmarks#8861
connortsui20 merged 3 commits into
developfrom
claude/codspeed-flaky-benchmarks-4vapbm

bench: use mimalloc in run_end_compress benchmarks

1902072
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CodSpeed HQ / CodSpeed Performance Analysis failed Jul 20, 2026

Performance Regression: -16.43%

❌ 6 regressed benchmarks
✅ 1662 untouched benchmarks
⏩ 46 skipped benchmarks1

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

Mode Benchmark BASE HEAD Efficiency
Simulation decompress[u64, (1000, 16)] 22.6 µs 31.1 µs -27.3%
Simulation decompress[u8, (1000, 4)] 24.5 µs 31.3 µs -21.55%
Simulation decompress[u8, (10000, 4)] 96 µs 111.6 µs -13.93%
Simulation decompress_utf8[(1000, 4)] 37.5 µs 43.5 µs -13.71%
Simulation take_indices[(10000, 256)] 57.3 µs 64.1 µs -10.63%
Simulation take_indices[(1000, 4)] 49.2 µs 54.7 µs -10.03%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.


Comparing claude/codspeed-flaky-benchmarks-4vapbm (1902072) with develop (b7b01d3)

Open in CodSpeed

Footnotes

  1. 46 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports.