1 /*$Id: PetscGetCPUTime.c,v 1.5 1999/05/04 20:38:02 balay Exp bsmith $*/ 2 3 #include "petsc.h" 4 5 #undef __FUNC__ 6 #define __FUNC__ "main" 7 int main( int argc, char **argv) 8 { 9 PLogDouble x, y; 10 long int i,j,A[100000],ierr; 11 12 PetscInitialize(&argc, &argv,0,0); 13 /* To take care of paging effects */ 14 ierr = PetscGetCPUTime(&y);CHKERRA(ierr); 15 16 for ( i=0; i<2; i++ ) { 17 ierr = PetscGetCPUTime(&x);CHKERRA(ierr); 18 19 /* 20 Do some work for at least 1 ms. Most CPU timers 21 cannot measure anything less than that 22 */ 23 24 for (j=0; j<20000*(i+1); j++) { 25 A[j]=i+j; 26 } 27 ierr = PetscGetCPUTime(&y);CHKERRA(ierr); 28 fprintf(stderr,"%-15s : %e sec\n","PetscGetCPUTime", (y-x)/10.0); 29 } 30 31 PetscFinalize(); 32 PetscFunctionReturn(0); 33 } 34