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Merge pull request #1515 from alfbr/master

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Reduce default number of threads from four to two with OpenMP
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Alf Birger Rustad 2018-06-25 18:36:51 +02:00 committed by GitHub
commit 10b0c45c2f
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1 changed files with 2 additions and 2 deletions
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opm/autodiff/FlowMainEbos.hpp
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@ -155,10 +155,10 @@ namespace Opm
#ifdef _OPENMP #ifdef _OPENMP
// OpenMP setup. // OpenMP setup.
if (!getenv("OMP_NUM_THREADS")) { if (!getenv("OMP_NUM_THREADS")) {
// Default to at most 4 threads, regardless of // Default to at most 2 threads, regardless of
// number of cores (unless ENV(OMP_NUM_THREADS) is defined) // number of cores (unless ENV(OMP_NUM_THREADS) is defined)
int num_cores = omp_get_num_procs(); int num_cores = omp_get_num_procs();
int num_threads = std::min(4, num_cores); int num_threads = std::min(2, num_cores);
omp_set_num_threads(num_threads); omp_set_num_threads(num_threads);
} }
// omp_get_num_threads() only works as expected within a parallel region. // omp_get_num_threads() only works as expected within a parallel region.