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[OpenMP][AIX] Use syssmt() to get the number of SMTs per physical CPU #89985

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Apr 26, 2024
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[OpenMP][AIX] Use syssmt() to get the number of SMTs per physical CPU #89985

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10 changes: 1 addition & 9 deletions openmp/runtime/src/kmp_affinity.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3038,15 +3038,7 @@ static bool __kmp_affinity_create_cpuinfo_map(int *line,
KMP_INFORM(AffParseFilename, "KMP_AFFINITY", "system info for topology");

// Get the number of SMT threads per core.
int retval =
lpar_get_info(LPAR_INFO_FORMAT1, &cpuinfo, sizeof(lpar_info_format1_t));
if (!retval)
smt_threads = cpuinfo.smt_threads;
else {
CLEANUP_THREAD_INFO;
*msg_id = kmp_i18n_str_UnknownTopology;
return false;
}
smt_threads = syssmt(GET_NUMBER_SMT_SETS, 0, 0, NULL);

// Allocate a resource set containing available system resourses.
rsethandle_t sys_rset = rs_alloc(RS_SYSTEM);
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2 changes: 2 additions & 0 deletions openmp/runtime/src/kmp_affinity.h
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Expand Up @@ -322,6 +322,8 @@ class KMPHwlocAffinity : public KMPAffinity {
#include <sys/dr.h>
#include <sys/rset.h>
#define VMI_MAXRADS 64 // Maximum number of RADs allowed by AIX.
#define GET_NUMBER_SMT_SETS 0x0004
extern "C" int syssmt(int flags, int, int, int *);
#endif
class KMPNativeAffinity : public KMPAffinity {
class Mask : public KMPAffinity::Mask {
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