Developer Reference

  • 0.10
  • 10/21/2020
  • Public Content
Contents

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; }

Product and Performance Information

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Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

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