feat(dd): add first benchmark suite for performance validation #9136
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- Create dd's first benchmark suite using divan framework - Benchmark various block sizes (4K, 8K, 64K, 1M) to measure performance - Test different dd scenarios: default, partial copy, skip, seek operations - Measure impact of separate input/output block sizes - All benchmarks use status=none to avoid output noise - Benchmarks verify the O_DIRECT buffer alignment optimization - Follows existing uutils benchmark patterns and conventions
CodSpeed Performance ReportMerging #9136 will degrade performances by 2.64%Comparing Summary
Benchmarks breakdown
Footnotes
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GNU testsuite comparison: |
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GNU testsuite comparison: |
Contributor
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can we have tests that take between 100 to 300ms? |
Increase benchmark dataset sizes to achieve consistent 100-300ms timing: - dd_copy_default: 16 -> 32 MB - dd_copy_4k_blocks: 16 -> 24 MB - dd_copy_64k_blocks: 16 -> 64 MB - dd_copy_1m_blocks: 16 -> 128 MB - dd_copy_separate_blocks: 16 -> 48 MB - dd_copy_partial: 16 -> 32 MB - dd_copy_with_skip: 16 -> 48 MB - dd_copy_with_seek: 16 -> 48 MB - dd_copy_8k_blocks: 16 -> 32 MB This ensures stable, repeatable benchmark measurements across different systems.
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GNU testsuite comparison: |
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Add dd benchmark suite to validate O_DIRECT optimization theory from PR #9104.
This addresses the high priority checklist item in PR #9104. Results show 7-8x performance improvement with larger blocks (default 85.12ms vs 1M blocks 11.62ms), confirming that page-aligned buffers reduce syscall overhead
Benchmarks will track performance regression and establish baseline for O_DIRECT implementation.