Actual source code: PetscGetCPUTime.c
petsc-3.7.1 2016-05-15
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      2: #include <petsctime.h>

      6: int main(int argc,char **argv)
      7: {
      8:   PetscLogDouble x,y;
      9:   long int       i,j,A[100000],ierr;

     11:   PetscInitialize(&argc,&argv,0,0);
     12:   /* To take care of paging effects */
     13:   PetscGetCPUTime(&y);

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

     18:     /*
     19:        Do some work for at least 1 ms. Most CPU timers
     20:        cannot measure anything less than that
     21:      */

     23:     for (j=0; j<20000*(i+1); j++) A[j]=i+j;
     24:     PetscGetCPUTime(&y);
     25:     fprintf(stdout,"%-15s : %e sec\n","PetscGetCPUTime",(y-x)/10.0);
     26:   }

     28:   PetscFinalize();
     29:   return(0);
     30: }