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[Support][PPC] Fix bot failures due to cd53ded557c3

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Commit https://reviews.llvm.org/rGcd53ded557c3 attempts to fix the
computation in computeHostNumPhysicalCores() to respect Affinity.
However, the GLIBC wrapper of the affinity system call fails with
a default size of cpu_set_t on systems that have more than 1024 CPUs.
This just fixes the computation on such large machines.
This commit is contained in:
Nemanja Ivanovic 2020-08-04 08:30:51 -05:00
parent 39f039150b
commit a77cd49128
1 changed files with 15 additions and 3 deletions
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18
lib/Support/Host.cpp
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@ -1274,9 +1274,21 @@ int computeHostNumPhysicalCores() {
#elif defined(__linux__) && defined(__powerpc__)
int computeHostNumPhysicalCores() {
cpu_set_t Affinity;
if (sched_getaffinity(0, sizeof(Affinity), &Affinity) != 0)
return -1;
return CPU_COUNT(&Affinity);
if (sched_getaffinity(0, sizeof(Affinity), &Affinity) == 0)
return CPU_COUNT(&Affinity);
// The call to sched_getaffinity() may have failed because the Affinity
// mask is too small for the number of CPU's on the system (i.e. the
// system has more than 1024 CPUs). Allocate a mask large enough for
// twice as many CPUs.
cpu_set_t *DynAffinity;
DynAffinity = CPU_ALLOC(2048);
if (sched_getaffinity(0, CPU_ALLOC_SIZE(2048), DynAffinity) == 0) {
int NumCPUs = CPU_COUNT(DynAffinity);
CPU_FREE(DynAffinity);
return NumCPUs;
}
return -1;
}
#elif defined(__linux__) && defined(__s390x__)
int computeHostNumPhysicalCores() { return sysconf(_SC_NPROCESSORS_ONLN); }