1 2 #include <petsctime.h> 3 4 #undef __FUNCT__ 5 #define __FUNCT__ "main" 6 int main(int argc,char **argv) 7 { 8 PetscLogDouble x,y; 9 long int i,j,A[100000],ierr; 10 11 ierr = PetscInitialize(&argc,&argv,0,0);if (ierr) return ierr; 12 /* To take care of paging effects */ 13 ierr = PetscGetCPUTime(&y);CHKERRQ(ierr); 14 15 for (i=0; i<2; i++) { 16 ierr = PetscGetCPUTime(&x);CHKERRQ(ierr); 17 18 /* 19 Do some work for at least 1 ms. Most CPU timers 20 cannot measure anything less than that 21 */ 22 23 for (j=0; j<20000*(i+1); j++) A[j]=i+j; 24 ierr = PetscGetCPUTime(&y);CHKERRQ(ierr); 25 fprintf(stdout,"%-15s : %e sec\n","PetscGetCPUTime",(y-x)/10.0); 26 } 27 28 ierr = PetscFinalize(); 29 return ierr; 30 } 31