Align data buffers in fastlanes benchmarks

[AdamGS]

Summary

An experiment to align the packed buffers in the benchmarks to try and reduce some of the noise around the compare benchmark. If this works maybe its a path towards more consistent benchmarks?

[codspeed-hq]

Merging this PR will degrade performance by 12.75%

⚠️ 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

⚡ 2 improved benchmarks
❌ 11 regressed benchmarks
✅ 1515 untouched benchmarks
⏩ 10 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	baseline_lt[16, 65536]	219.3 µs	304.8 µs	-28.04%
❌	Simulation	baseline_eq[4, 65536]	186.9 µs	244.4 µs	-23.53%
❌	Simulation	baseline_lt[4, 65536]	202.6 µs	259.6 µs	-21.97%
❌	Simulation	baseline_eq[16, 65536]	231.8 µs	289.4 µs	-19.89%
❌	Simulation	fast_lt_out_of_range[16, 65536]	120.5 µs	148.4 µs	-18.8%
❌	Simulation	compare[12]	115.9 µs	136.5 µs	-15.15%
❌	Simulation	varbinview_large	112.9 µs	131.5 µs	-14.14%
❌	Simulation	decompress_rd[f64, (100000, 0.01)]	845.9 µs	981.5 µs	-13.82%
❌	Simulation	decompress_rd[f64, (100000, 0.1)]	845.9 µs	981.5 µs	-13.82%
❌	Simulation	compare[8]	105 µs	118.3 µs	-11.25%
❌	Simulation	compare[10]	135.9 µs	152.9 µs	-11.1%
⚡	Simulation	decompress_rd[f64, (100000, 0.0)]	1,024.6 µs	845.8 µs	+21.14%
⚡	Simulation	decompress_rd[f32, (100000, 0.0)]	586.8 µs	499.3 µs	+17.53%

Tip

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

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_{Comparing adamg/align-buffers-benchmarks (3abc40b) with develop (37ae2d7)}

Footnotes

1. 10 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. ↩