Actual source code: PetscGetCPUTime.c

  1: /*$Id: PetscGetCPUTime.c,v 1.12 2001/08/29 20:59:41 balay Exp $*/

 3:  #include petsc.h

  7: int main(int argc,char **argv)
  8: {
  9:   PetscLogDouble 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:   PetscGetCPUTime(&y);

 16:   for (i=0; i<2; i++) {
 17:     PetscGetCPUTime(&x);

 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:     PetscGetCPUTime(&y);
 28:     fprintf(stdout,"%-15s : %e sec\n","PetscGetCPUTime",(y-x)/10.0);
 29:   }

 31:   PetscFinalize();
 32:   return(0);
 33: }