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Avoid pinning an E-core for newer Intel CPUs #531

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k0kubun merged 1 commit into from
Aug 31, 2026
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Avoid pinning an E-core for newer Intel CPUs #531

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4 changes: 2 additions & 2 deletions lib/benchmark_suite.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -236,8 +236,8 @@ def base_cmd(ruby_description, benchmark_name)
# Pin the process to one given core to improve caching and reduce variance on CRuby
# Other Rubies need to use multiple cores, e.g., for JIT threads
if ruby_description.start_with?('ruby ') && should_pin?(benchmark_name)
# The last few cores of Intel CPU may be slow E-Cores, so avoid using the last one.
cpu = [(Etc.nprocessors / 2) - 1, 0].max
# Up to the last two thirds of Intel CPU cores may be slow E-Cores, so avoid using them.
cpu = [(Etc.nprocessors / 3) - 1, 0].max
cmd.concat(["taskset", "-c", "#{cpu}"])
end

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