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Add openblas_getaffinity() extension (Linux-only) #3702

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merged 2 commits into from
Jul 27, 2022
Merged

Add openblas_getaffinity() extension (Linux-only) #3702

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8668571
add openblas_getaffinity()
martin-frbg Jul 27, 2022
30473b6
add openblas_getaffinity()
martin-frbg Jul 27, 2022
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2 changes: 2 additions & 0 deletions cblas.h
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,8 @@ char* openblas_get_corename(void);
#ifdef OPENBLAS_OS_LINUX
/* Sets thread affinity for OpenBLAS threads. `thread_idx` is in [0, openblas_get_num_threads()-1]. */
int openblas_setaffinity(int thread_idx, size_t cpusetsize, cpu_set_t* cpu_set);
/* Queries thread affinity for OpenBLAS threads. `thread_idx` is in [0, openblas_get_num_threads()-1]. */
int openblas_getaffinity(int thread_idx, size_t cpusetsize, cpu_set_t* cpu_set);
#endif

/* Get the parallelization type which is used by OpenBLAS */
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14 changes: 14 additions & 0 deletions driver/others/blas_server.c
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Expand Up @@ -352,6 +352,20 @@ int openblas_setaffinity(int thread_idx, size_t cpusetsize, cpu_set_t* cpu_set)

return pthread_setaffinity_np(thread, cpusetsize, cpu_set);
}
int openblas_getaffinity(int thread_idx, size_t cpusetsize, cpu_set_t* cpu_set) {
const int active_threads = openblas_get_num_threads();

if (thread_idx < 0 || thread_idx >= active_threads) {
errno = EINVAL;
return -1;
}

pthread_t thread = (thread_idx == active_threads - 1)
? pthread_self()
: blas_threads[thread_idx];

return pthread_getaffinity_np(thread, cpusetsize, cpu_set);
}
#endif

static void* blas_thread_server(void *arg){
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