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Bind TBB max threads num to OMP_NUM_THREADS environment variable value #225

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Merged
allnes merged 1 commit into from
Jan 18, 2025
Merged

Bind TBB max threads num to OMP_NUM_THREADS environment variable value #225

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16 changes: 16 additions & 0 deletions tasks/all/runner.cpp
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
#include <gtest/gtest.h>
#include <tbb/global_control.h>

#include <boost/mpi/communicator.hpp>
#include <boost/mpi/environment.hpp>
Expand Down Expand Up @@ -56,6 +57,21 @@ int main(int argc, char** argv) {
boost::mpi::environment env(argc, argv);
boost::mpi::communicator world;

#ifdef _WIN32
size_t len;
char omp_env[100];
errno_t err = getenv_s(&len, omp_env, sizeof(omp_env), "OMP_NUM_THREADS");
if (err != 0 || len == 0) {
omp_env[0] = '\0';
}
#else
const char* omp_env = std::getenv("OMP_NUM_THREADS");
#endif
int num_threads = (omp_env != nullptr) ? std::atoi(omp_env) : 1;

// Limit the number of threads in TBB
tbb::global_control control(tbb::global_control::max_allowed_parallelism, num_threads);

::testing::InitGoogleTest(&argc, argv);

auto& listeners = ::testing::UnitTest::GetInstance()->listeners();
Expand Down
18 changes: 17 additions & 1 deletion tasks/tbb/runner.cpp
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Original file line number Diff line number Diff line change
@@ -1,6 +1,22 @@
#include <gtest/gtest.h>
#include <tbb/global_control.h>

int main(int argc, char** argv) {
#ifdef _WIN32
size_t len;
char omp_env[100];
errno_t err = getenv_s(&len, omp_env, sizeof(omp_env), "OMP_NUM_THREADS");
if (err != 0 || len == 0) {
omp_env[0] = '\0';
}
#else
const char* omp_env = std::getenv("OMP_NUM_THREADS");
#endif
int num_threads = (omp_env != nullptr) ? std::atoi(omp_env) : 1;

// Limit the number of threads in TBB
tbb::global_control control(tbb::global_control::max_allowed_parallelism, num_threads);

int main(int argc, char **argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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