PetscBLASSetNumThreads#
set the number of threads for calls to BLAS to use
Synopsis#
#include "petscsys.h"
PetscErrorCode PetscBLASSetNumThreads(PetscInt nt)
Input Parameter#
nt - the number of threads
Options Database Key#
-blas_num_threads
- set the number of threads when PETSc is initialized
Notes#
The environmental variables BLIS_NUM_THREADS, MKL_NUM_THREADS, or OPENBLAS_NUM_THREADS, OMP_NUM_THREADS
may also affect the number of threads used depending on the BLAS libraries being used. A call to this function
overwrites those values.
With the BLIS BLAS implementation one can use BLIS_THREAD_IMPL=pthread or BLIS_THREAD_IMPL=openmp to determine how
BLIS implements the parallelism.
See Also#
Level#
intermediate
Location#
Index of all Sys routines
Table of Contents for all manual pages
Index of all manual pages