Fix the return value of Concurrent.available_processor_count when cpu.cfs_quota_us is -1
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eregon
reviewed
Aug 9, 2024
| return nil if max == 0 | ||
| # If the cpu.cfs_quota_us is -1, cgroup does not adhere to any CPU time restrictions | ||
| # https://docs.kernel.org/scheduler/sched-bwc.html#management | ||
| return nil if max == 0 || max == -1 |
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Maybe we should check if max <= 0?
Seems a tiny bit safer and more efficient as we can't interpret a value <= 0 safely.
Could you change to that?
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Thanks for your review. I updated the condition.
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Thanks and sorry for the bug. |
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…cpu.cfs_quota_us` is -1 I tried to use `Concurrent.available_processor_count` in `parallel` gem, but we got some feedback `Concurrent.available_processor_count` returned a negative value. grosser/parallel#348 (comment) grosser/parallel#349 (comment) According to the https://docs.kernel.org/scheduler/sched-bwc.html#management, The default value of `cpu.cfs_quota_us` is -1. In that case, cgroup does not adhere to any CPU time restrictions. This PR adds the case of `cpu.cfs_quota_us` is -1 to `#cpu_quota` to return processor count from `Concurrent.available_processor_count` in that case.
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I've added a CHANGELOG entry. |
eregon
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Aug 10, 2024
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I released https://github.com/ruby-concurrency/concurrent-ruby/releases/tag/v1.3.4 with this fix |
This was referenced Aug 10, 2024
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I tried to use
Concurrent.available_processor_countinparallelgem, but we got some feedbackConcurrent.available_processor_countreturned a negative value.grosser/parallel#348 (comment)
grosser/parallel#349 (comment)
According to the https://docs.kernel.org/scheduler/sched-bwc.html#management, The default value of
cpu.cfs_quota_usis -1. In that case, cgroup does not adhere to any CPU time restrictions.This PR adds the case of
cpu.cfs_quota_usis -1 to#cpu_quotato return processor count fromConcurrent.available_processor_countin that case.