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Use num_threads clause of #pragma omp parallel instead to avoid calling omp_set_num_threads for the entire application

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This commit is contained in:
Woody Chow 2017-05-29 14:16:10 +09:00
parent 913a2dbdaa
commit 6e00c7651b
1 changed files with 6 additions and 6 deletions
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12
modules/core/src/parallel.cpp
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@ -349,7 +349,7 @@ void cv::parallel_for_(const cv::Range& range, const cv::ParallelLoopBody& body,
#elif defined HAVE_OPENMP
#pragma omp parallel for schedule(dynamic)
#pragma omp parallel for schedule(dynamic) num_threads(numThreads > 0 ? numThreads : numThreadsMax)
for (int i = stripeRange.start; i < stripeRange.end; ++i)
pbody(Range(i, i + 1));
@ -418,7 +418,10 @@ int cv::getNumThreads(void)
#elif defined HAVE_OPENMP
return omp_get_max_threads();
return numThreads > 0
? numThreads
: numThreadsMax;
#elif defined HAVE_GCD
@ -463,10 +466,7 @@ void cv::setNumThreads( int threads )
#elif defined HAVE_OPENMP
if(omp_in_parallel())
return; // can't change number of openmp threads inside a parallel region
omp_set_num_threads(threads > 0 ? threads : numThreadsMax);
return; // nothing needed as num_threads clause is used in #pragma omp parallel for
#elif defined HAVE_GCD