darwin/arm64: use the number of perf cores as the default number of workers#68
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charlievieth merged 1 commit intomasterfrom Nov 16, 2025
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darwin/arm64: use the number of perf cores as the default number of workers#68charlievieth merged 1 commit intomasterfrom
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Codecov Report❌ Patch coverage is
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## master #68 +/- ##
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- Coverage 59.61% 59.24% -0.38%
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Files 12 13 +1
Lines 629 633 +4
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- Misses 240 244 +4
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…orkers
Starting around macOS v15 the parallel performance of the APFS file
system appears slightly improved and now the ideal number of fastwalk
workers is generally the number of performance cores currently
available.
Therefore, this commit changes the default number of workers on
darwin/arm64 to be the value of sysctl("hw.perflevel0.physicalcpu")
which is the number of currently available performance cores (link to
xnu source below).
https://github.com/apple-oss-distributions/xnu/blob/43a90889846e00bfb5cf1d255cdc0a701a1e05a4/bsd/sys/sysctl.h#L1244
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Starting around macOS v15 the parallel performance of the APFS file system appears slightly improved and now the ideal number of fastwalk workers is generally the number of performance cores currently available.
Therefore, this commit changes the default number of workers on darwin/arm64 to be the value of sysctl("hw.perflevel0.physicalcpu") which is the number of currently available performance cores (link to xnu source below).
github.com/apple-oss-distributions/xnu/blob/43a9088/bsd/sys/sysctl.h#L1244