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Fix: nosmt OMP Threads Default #3647

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Nov 29, 2023
Merged

Fix: nosmt OMP Threads Default #3647

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7 changes: 4 additions & 3 deletions Src/Base/AMReX_OpenMP.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -152,12 +152,13 @@ namespace amrex::OpenMP
// default or OMP_NUM_THREADS environment variable
} else if (omp_threads == "nosmt") {
char const *env_omp_num_threads = std::getenv("OMP_NUM_THREADS");
if (env_omp_num_threads != nullptr && amrex::system::verbose > 1) {
if (env_omp_num_threads == nullptr) {
omp_set_num_threads(numUniquePhysicalCores());
}
else if (amrex::system::verbose > 1) {
amrex::Print() << "amrex.omp_threads was set to nosmt,"
<< "but OMP_NUM_THREADS was set. Will keep "
<< "OMP_NUM_THREADS=" << env_omp_num_threads << ".\n";
} else {
omp_set_num_threads(numUniquePhysicalCores());
}
} else {
std::optional<int> num_omp_threads = to_int(omp_threads);
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