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Performance History

Latest Results

tr: write to stdout without line buffering Stdout is line buffered: every chunk was searched for its last newline, and the bytes after it cost an extra write. Write to the file descriptor directly, as cat and tee do. Keep write_output out of line: once inlined into the per-byte loop of translate_input, it made the translator state go to memory on every byte, doubling the time of tr -s. Give test_broken_pipe_no_error more than a pipe buffer to write: it only hit the broken pipe when the output came late, which was already racy on main (1 failure in 60 runs) and became frequent here. Mean of 30 paired runs on a pinned core, 100 MB input: before after tr -d '\n' (text) 36.23 ms 32.64 ms tr -d '\r\n' (CSV) 35.66 ms 31.94 ms

charly-mp:tr-faster-delete

27 minutes ago

tr: write to stdout without line buffering Stdout is line buffered: every chunk was searched for its last newline, and the bytes after it cost an extra write. Write to the file descriptor directly, as cat and tee do. Keep write_output out of line: once inlined into the per-byte loop of translate_input, it made the translator state go to memory on every byte, doubling the time of tr -s. Give test_broken_pipe_no_error more than a pipe buffer to write: it only hit the broken pipe because the output used to be delayed. Mean of 30 paired runs on a pinned core, 100 MB input: before after tr -d '\n' (text) 36.23 ms 32.64 ms tr -d '\r\n' (CSV) 35.66 ms 31.94 ms

charly-mp:tr-faster-delete

2 hours ago

build: gate SELinux utilities behind feat_selinux

xtqqczze:features-feat_selinux

3 hours ago

uucore: only honour the last glibc.cpu.hwcaps setting, case-sensitively Signed-off-by: Zhiwei Liang <zhiwei.liang@zliang.me>

ChihweiLHBird:zhiwei/fix-hwcaps-tunable-parsing

3 hours ago

dd: ignore a failed cache drop while copying Signed-off-by: Zhiwei Liang <zhiwei.liang@zliang.me>

ChihweiLHBird:zhiwei/fix-dd-nocache-on-a-pipe

3 hours ago

dd: fix conv=block/unblock conflict handling Signed-off-by: Zhiwei Liang <zhiwei.liang@zliang.me>

ChihweiLHBird:zhiwei/fix-dd-conv-conflicts

3 hours ago

numfmt: fold format-escape error test into cases array Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

main

3 hours ago

csplit: test a negative offset bound with --suppress-matched

main

3 hours ago

Latest Branches

-2%

tr: speed up -d#14897

3 hours ago

d9d4e8a

charly-mp:tr-faster-delete

+8%

build: gate SELinux utilities behind selinux#12395

4 months ago

7f0bcc2

xtqqczze:features-feat_selinux

-9%

uucore: only honour the last glibc.cpu.hwcaps setting, case-sensitively#14844

3 days ago

4d4f267

ChihweiLHBird:zhiwei/fix-hwcaps-tunable-parsing

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