56 lines
1.5 KiB
Diff
56 lines
1.5 KiB
Diff
commit 45c2456a56337ebcafe0dd9faa2bd995ccbc3357
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Mon Nov 11 14:05:53 2024 +0100
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nproc: Use affinity mask even on systems with more than 1024 CPUs.
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* lib/nproc.c (num_processors_via_affinity_mask): Retry
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with larger affinity masks if CPU_ALLOC_SIZE is available.
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diff --git a/lib/nproc.c b/lib/nproc.c
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index 92a07e8289..48bc3d06fa 100644
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--- a/lib/nproc.c
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+++ b/lib/nproc.c
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@@ -20,6 +20,7 @@
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#include <config.h>
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#include "nproc.h"
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+#include <errno.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <unistd.h>
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@@ -124,6 +125,33 @@ num_processors_via_affinity_mask (void)
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return count;
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}
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}
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+#elif HAVE_SCHED_GETAFFINITY_LIKE_GLIBC \
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+ && defined CPU_ALLOC_SIZE /* glibc >= 2.6 */
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+ {
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+ unsigned int alloc_count = 1024;
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+ while (1)
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+ {
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+ cpu_set_t *set = CPU_ALLOC (alloc_count);
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+ if (set == NULL)
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+ return 0;
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+ unsigned int size = CPU_ALLOC_SIZE (alloc_count);
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+ if (sched_getaffinity (0, size, set) == 0)
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+ {
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+ unsigned int count = CPU_COUNT_S (size, set);
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+ CPU_FREE (set);
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+ return count;
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+ }
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+ if (errno != EINVAL)
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+ {
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+ CPU_FREE (set);
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+ return 0;
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+ }
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+ CPU_FREE (set);
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+ alloc_count *= 2;
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+ if (alloc_count == 0)
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+ return 0;
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+ }
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+ }
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#elif HAVE_SCHED_GETAFFINITY_LIKE_GLIBC /* glibc >= 2.3.4 */
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{
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cpu_set_t set;
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