Developer Reference


Usage Example for the Memory Functions

#include <stdio.h> #include <mkl.h> int main(void) { double *a, *b, *c; int n, i; double alpha, beta; MKL_INT64 AllocatedBytes; int N_AllocatedBuffers; alpha = 1.1; beta = -1.2; n = 1000; mkl_peak_mem_usage(MKL_PEAK_MEM_ENABLE); a = (double*)mkl_malloc(n*n*sizeof(double),64); b = (double*)mkl_malloc(n*n*sizeof(double),64); c = (double*)mkl_calloc(n*n,sizeof(double),64); for (i=0;i<(n*n);i++) { a[i] = (double)(i+1); b[i] = (double)(-i-1); } dgemm("N","N",&n,&n,&n,&alpha,a,&n,b,&n,&beta,c,&n); AllocatedBytes = mkl_mem_stat(&N_AllocatedBuffers); printf("\nDGEMM uses %d bytes in %d buffers",AllocatedBytes,N_AllocatedBuffers); mkl_free_buffers(); mkl_free(a); mkl_free(b); mkl_free(c); AllocatedBytes = mkl_mem_stat(&N_AllocatedBuffers); if (AllocatedBytes > 0) { printf("\nMKL memory leak!"); printf("\nAfter mkl_free_buffers there are %d bytes in %d buffers", AllocatedBytes,N_AllocatedBuffers); } printf("\nPeak memory allocated by Intel MKL memory allocator %d bytes. Start to count new memory peak", mkl_peak_mem_usage(MKL_PEAK_MEM_RESET)); a = (double*)mkl_malloc(n*n*sizeof(double),64); a = (double*)mkl_realloc(a,2*n*n*sizeof(double)); mkl_free(a); printf("\nPeak memory allocated by Intel MKL memory allocator after reset of peak memory counter %d bytes\n", mkl_peak_mem_usage(MKL_PEAK_MEM)); return 0; }

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