1 #include <petsctime.h> 2 3 int main(int argc,char **argv) 4 { 5 PetscLogDouble x,y; 6 long int i,j,A[100000],ierr; 7 8 PetscCall(PetscInitialize(&argc,&argv,0,0)); 9 /* To take care of paging effects */ 10 PetscCall(PetscGetCPUTime(&y)); 11 12 for (i=0; i<2; i++) { 13 PetscCall(PetscGetCPUTime(&x)); 14 15 /* 16 Do some work for at least 1 ms. Most CPU timers 17 cannot measure anything less than that 18 */ 19 20 for (j=0; j<20000*(i+1); j++) A[j]=i+j; 21 PetscCall(PetscGetCPUTime(&y)); 22 fprintf(stdout,"%-15s : %e sec\n","PetscGetCPUTime",(y-x)/10.0); 23 } 24 25 PetscCall(PetscFinalize()); 26 return 0; 27 } 28