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tee: add splice() and tee() zero-copy fast-path#11943

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oech3 wants to merge 1 commit intouutils:mainfrom
oech3:tee-splice-m
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tee: add splice() and tee() zero-copy fast-path#11943
oech3 wants to merge 1 commit intouutils:mainfrom
oech3:tee-splice-m

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@oech3 oech3 commented Apr 22, 2026

Closes #11466 .

> tee </tmp/huge |pv >/dev/null
^C58GiB 0:00:01 [2.58GiB/s] 
> tee-splice </tmp/huge |pv >/dev/null
^C.6GiB 0:00:02 [38.4GiB/s]

@oech3 oech3 force-pushed the tee-splice-m branch 3 times, most recently from cfb3c51 to 8db29e1 Compare April 22, 2026 13:14
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codspeed-hq Bot commented Apr 22, 2026 •
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Merging this PR will not alter performance

✅ 309 untouched benchmarks
⏩ 46 skipped benchmarks1

Comparing oech3:tee-splice-m (5d9f980) with main (2f49d8e)

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Footnotes

  1. 46 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. ↩

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github-actions Bot commented Apr 22, 2026 •
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GNU testsuite comparison:

Skip an intermittent issue tests/date/date-locale-hour (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/cut/bounded-memory (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/pr/bounded-memory (passes in this run but fails in the 'main' branch)
Note: The gnu test tests/env/env-signal-handler was skipped on 'main' but is now failing.
Skip an intermittent issue tests/tail/tail-n0f (was skipped on 'main', now failing)

@oech3 oech3 marked this pull request as ready for review April 22, 2026 14:44
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tee: use splice and tee syscalls for performance

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