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[perf] Respect cgroup/CFS CPU quota in parallel worker count #8559

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Merged
TomasVotruba merged 1 commit into from
Oct 9, 2026
Merged

[perf] Respect cgroup/CFS CPU quota in parallel worker count #8559

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14 changes: 5 additions & 9 deletions src/Parallel/CpuCoreCountProvider.php
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Original file line number Diff line number Diff line change
Expand Up @@ -5,19 +5,15 @@
namespace Rector\Parallel;

use Fidry\CpuCoreCounter\CpuCoreCounter;
use Fidry\CpuCoreCounter\NumberOfCpuCoreNotFound;

final class CpuCoreCountProvider
{
private const int DEFAULT_CORE_COUNT = 2;

public function provide(): int
{
try {
return new CpuCoreCounter()
->getCount();
} catch (NumberOfCpuCoreNotFound) {
return self::DEFAULT_CORE_COUNT;
}
// getAvailableForParallelisation() respects cgroup/CFS quota (docker --cpus, KUBERNETES_CPU_LIMIT),
// unlike getCount() which reports host cores and overcommits workers in containers
return new CpuCoreCounter()
->getAvailableForParallelisation()
->availableCpus;
}
}
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