Minimize alignment noise in bitbuffer benchmarks

[AdamGS]

Summary

I'm trying to hunt down some of the noise in our benchmarks. This PR makes the bitbuffer benchmarks use a fixed alignment of 128 bytes.

[codspeed-hq]

Merging this PR will not alter performance

⚠️ 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.

⚡ 9 improved benchmarks
❌ 3 regressed benchmarks
✅ 1569 untouched benchmarks
⏩ 3 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	chunked_varbinview_canonical_into[(1000, 10)]	161.8 µs	198.6 µs	-18.54%
❌	Simulation	chunked_varbinview_into_canonical[(1000, 10)]	178 µs	214.7 µs	-17.11%
❌	Simulation	chunked_varbinview_canonical_into[(100, 100)]	273.7 µs	308.4 µs	-11.25%
⚡	Simulation	take_10k_random	255.7 µs	197.8 µs	+29.23%
⚡	Simulation	take_10k_contiguous	276.2 µs	218.3 µs	+26.54%
⚡	Simulation	patched_take_10k_contiguous_patches	290.9 µs	232.3 µs	+25.21%
⚡	Simulation	patched_take_10k_random	302.9 µs	244.2 µs	+24.01%
⚡	Simulation	chunked_varbinview_opt_canonical_into[(1000, 10)]	214.3 µs	177.8 µs	+20.54%
⚡	Simulation	bitwise_not_vortex_buffer_mut[2048]	427.8 ns	368.9 ns	+15.96%
⚡	Simulation	bitwise_not_vortex_buffer_mut[128]	244.4 ns	214.7 ns	+13.84%
⚡	Simulation	true_count_arrow_buffer[128]	784.7 ns	697.2 ns	+12.55%
⚡	Simulation	bitwise_not_vortex_buffer_mut[1024]	304.7 ns	275 ns	+10.81%

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/aligned-benchmarks (77fab70) with develop (ad46b6c)}

Footnotes

1. 3 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. ↩

[joseph-isaacs]

Why do you try the default alignment of all buffers