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consider affinity when computing active cpus on Linux #199

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Merged
MadCoder merged 1 commit into from
Jan 12, 2017
Merged

consider affinity when computing active cpus on Linux #199

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12 changes: 11 additions & 1 deletion src/shims/hw_config.h
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Original file line number Diff line number Diff line change
Expand Up @@ -87,7 +87,17 @@ _dispatch_hw_get_config(_dispatch_hw_config_t c)
case _dispatch_hw_config_physical_cpus:
return sysconf(_SC_NPROCESSORS_CONF);
case _dispatch_hw_config_active_cpus:
return sysconf(_SC_NPROCESSORS_ONLN);
{
#ifdef __USE_GNU
// Prefer pthread_getaffinity_np because it considers
// scheduler cpu affinity. This matters if the program
// is restricted to a subset of the online cpus (eg via numactl).
cpu_set_t cpuset;
if (pthread_getaffinity_np(pthread_self(), sizeof(cpu_set_t), &cpuset) == 0)
return CPU_COUNT(&cpuset);
#endif
return sysconf(_SC_NPROCESSORS_ONLN);
}
}
#else
const char *name = NULL;
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