Intel(R) Math Kernel Library for Linux* OS User's Guide

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Managing Performance and Memory 6• For the bash shell, enter: export OMP_NUM_THREADS=• For the csh or tcsh shell, enter: set OMP_NUM_THREADS=.See Using Additional Threading Control on how to set the number of threads using IntelMKL environment variables, for example, MKL_NUM_THREADS.Changing the Number of Threads at Run TimeYou cannot change the number of threads during run time using the environment variables.However, you can call OpenMP API functions from your program to change the number ofthreads during run time. The following sample code shows how to change the number ofthreads during run time using the omp_set_num_threads() routine. See also Techniquesto Set the Number of Threads.The following example shows both C and Fortran code examples. To run this example in theC language, use the omp.h header file from the Intel® compiler package. If you do nothave the Intel compiler but wish to explore the functionality in the example, use FortranAPI for omp_set_num_threads() rather than the C version. For example,omp_set_num_threads_( &i_one );Example 6-1Changing the Number of Threads// ******* C language *******#include "omp.h"#include "mkl.h"#include #define SIZE 1000void main(int args, char *argv[]){double *a, *b, *c;a = new double [SIZE*SIZE];b = new double [SIZE*SIZE];c = new double [SIZE*SIZE];double alpha=1, beta=1;int m=SIZE, n=SIZE, k=SIZE, lda=SIZE, ldb=SIZE, ldc=SIZE, i=0, j=0;char transa='n', transb='n';for( i=0; i
6 Intel® Math Kernel Library User’s GuideExample 6-1Changing the Number of Threads (continued)}}cblas_dgemm(CblasRowMajor, CblasNoTrans, CblasNoTrans,m, n, k, alpha, a, lda, b, ldb, beta, c, ldc);printf("row\ta\tc\n");for ( i=0;i
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Intel® Math Kernel Libraryfor Linu
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ContentsChapter 1Chapter 2Chapter 3
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ContentsOperating on Denormals.....
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A Intel® Math Kernel Library User
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Support for Third-PartyInterfacesBT
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