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bench: compare uniform and per-chunk bitpacking - #9945

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bench: compare uniform and per-chunk bitpacking#9945
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bench: compare uniform and per-chunk bitpacking

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CodSpeed / CodSpeed Performance Analysis failed Sep 22, 2026 in 0s

Performance Regression: -0.43%

⚠️ 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.

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 3 improved benchmarks
❌ 2 regressed benchmarks
✅ 2203 untouched benchmarks
🆕 160 new benchmarks
⏩ 287 skipped benchmarks1

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

Mode Benchmark BASE HEAD Efficiency
❌ Simulation take_fsl_u32_random[256, 10] 124.5 µs 159.6 µs -21.97%
❌ WallTime dbp_split_kernel_mixed_null_avx2[(I128, 1024)] 1.1 µs 1.3 µs -11.5%
⚡ Simulation take_fsl_u32_random[128, 100] 237.4 µs 208.2 µs +14%
⚡ Simulation take_fsl_f16_random[256, 100] 230.8 µs 204.8 µs +12.67%
⚡ Simulation take_fsl_u64_random[64, 10] 124.4 µs 112.7 µs +10.33%
🆕 Simulation compress_v1[u16, drift] N/A 295.7 µs N/A
🆕 Simulation compress_v1[u16, drift+exc1%] N/A 832.6 µs N/A
🆕 Simulation compress_v1[u16, drift+null10%] N/A 523.5 µs N/A
🆕 Simulation compress_v1[u16, random] N/A 300.3 µs N/A
🆕 Simulation compress_v1[u16, spiky] N/A 888.4 µs N/A
🆕 Simulation compress_v1[u16, spiky+exc1%] N/A 895.2 µs N/A
🆕 Simulation compress_v1[u16, uniform] N/A 272.4 µs N/A
🆕 Simulation compress_v1[u16, uniform+exc1%] N/A 814.8 µs N/A
🆕 Simulation compress_v1[u16, uniform+null10%] N/A 500.2 µs N/A
🆕 Simulation compress_v1[u16, zero_heavy] N/A 272.5 µs N/A
🆕 Simulation compress_v1[u32, drift] N/A 432.1 µs N/A
🆕 Simulation compress_v1[u32, drift+exc1%] N/A 992.4 µs N/A
🆕 Simulation compress_v1[u32, drift+null10%] N/A 1.5 ms N/A
🆕 Simulation compress_v1[u32, random] N/A 432 µs N/A
🆕 Simulation compress_v1[u32, spiky] N/A 1 ms N/A
... ... ... ... ... ...

ℹ️ Only the first 20 benchmarks are displayed. Go to the app to view all benchmarks.

Tip

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

Comparing mk/bitpacked-stack-09-benchmarks (545cb8a) with mk/bitpacked-stack-08-fused-encoder (f2104c5)

Open in CodSpeed

Footnotes

  1. 287 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. ↩

View more details on CodSpeed