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Reduce concurrency during cmake c++ build to avoid ooms - #9870

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rk/c++flakes
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robert3005 wants to merge 1 commit into
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rk/c++flakes

Reduce concurrency during cmake c++ build to avoid ooms

8b25b38
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CodSpeed / CodSpeed Performance Analysis failed Sep 14, 2026 in 0s

Performance Regression: -6.12%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

⚡ 2 improved benchmarks
❌ 1 regressed benchmark
✅ 2194 untouched benchmarks
⏩ 218 skipped benchmarks1

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

Mode Benchmark BASE HEAD Efficiency
WallTime arrow_checked_add_u32_neon[16384] 12.3 µs 20.3 µs -39.61%
WallTime arrow_checked_add_u32_avx2[16384] 21.3 µs 17.6 µs +20.77%
Simulation allocate_drop_arrow[0] 456.9 ns 402.7 ns +13.45%

Tip

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


Comparing rk/c++flakes (8b25b38) with develop (8f3dfb4)

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Footnotes

  1. 218 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.