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[test] Limit the number of launched threads in shift_left_right.pass with the OMP backend to avoid timeouts #1928

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merged 2 commits into from
Nov 1, 2024
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[test] Limit the number of launched threads in shift_left_right.pass with the OMP backend to avoid timeouts #1928

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Limit the number of omp threads launched in shift_left_right.pass to …
mmichel11 Nov 1, 2024
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mmichel11 Nov 1, 2024
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11 changes: 11 additions & 0 deletions test/parallel_api/algorithm/alg.modifying.operations/shift_left_right.pass.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,10 @@
#include "support/sycl_alloc_utils.h"
#endif

#if ONEDPL_USE_OPENMP_BACKEND
#include <omp.h> // omp_get_max_threads, omp_set_num_threads
#endif

template<typename Name>
struct USM;

Expand Down Expand Up @@ -214,6 +218,13 @@ test_shift_by_type(Size m, Size n)
int
main()
{
#if ONEDPL_USE_OPENMP_BACKEND
// Due to small problem sizes in this test, runtime explodes on CPUs with large core counts due to
// small grain sizes per thread and cross-socket traffic.
const int max_threads = omp_get_max_threads();
const int threads_to_use = std::min(max_threads, int(32));
omp_set_num_threads(threads_to_use);
#endif
using ValueType = ::std::int32_t;

const ::std::size_t N = 100000;
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