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Refs #153. Restore the original CPU affinity when calling openblas_set_num_threads(1). 

Please read the issue on github.com for the detail.
This commit is contained in:
Zhang Xianyi 2012-11-06 18:21:46 +08:00
parent 0f26a21624
commit 538c764d2b
1 changed files with 20 additions and 0 deletions
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20
driver/others/blas_server.c
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@ -770,6 +770,19 @@ void goto_set_num_threads(int num_threads) {
if (num_threads < 1) num_threads = blas_num_threads; if (num_threads < 1) num_threads = blas_num_threads;
#ifndef NO_AFFINITY
if (num_threads == 1) {
if (blas_cpu_number == 1){
//OpenBLAS is already single thread.
return;
}else{
//From multi-threads to single thread
//Restore the original affinity mask
gotoblas_set_affinity(-1);
}
}
#endif
if (num_threads > MAX_CPU_NUMBER) num_threads = MAX_CPU_NUMBER; if (num_threads > MAX_CPU_NUMBER) num_threads = MAX_CPU_NUMBER;
if (num_threads > blas_num_threads) { if (num_threads > blas_num_threads) {
@ -800,6 +813,13 @@ void goto_set_num_threads(int num_threads) {
UNLOCK_COMMAND(&server_lock); UNLOCK_COMMAND(&server_lock);
} }
#ifndef NO_AFFINITY
if(blas_cpu_number == 1 && num_threads > 1){
//Restore the thread 0 affinity.
gotoblas_set_affinity(0);
}
#endif
blas_cpu_number = num_threads; blas_cpu_number = num_threads;
#if defined(ARCH_MIPS64) #if defined(ARCH_MIPS64)