2:  #include <petscsys.h>
  3:  #include <petsctime.h>

  5: int main(int argc,char **argv)
  6: {
  7:   PetscLogDouble x,y;
  8:   PetscLogEvent  e1;
 10:   PetscBool      flg;

 12:   PetscInitialize(&argc,&argv,0,0);if (ierr) return ierr;
 13:   PetscLogEventRegister("*DummyEvent",0,&e1);
 14:   /* To take care of the paging effects */
 15:   PetscTime(&x);
 16:   PetscLogEventBegin(e1,&x,0,0,0);
 17:   PetscLogEventEnd(e1,&x,0,0,0);

 19:   PetscTime(&x);
 20:   /* 10 Occurences of the dummy event */
 21:   PetscLogEventBegin(e1,&x,0,0,0);
 22:   PetscLogEventEnd(e1,&x,0,0,0);
 23:   PetscLogEventBegin(e1,&x,&y,0,0);
 24:   PetscLogEventEnd(e1,&x,&y,0,0);
 25:   PetscLogEventBegin(e1,&y,0,0,0);
 26:   PetscLogEventEnd(e1,&y,0,0,0);
 27:   PetscLogEventBegin(e1,&x,0,0,0);
 28:   PetscLogEventEnd(e1,&x,0,0,0);
 29:   PetscLogEventBegin(e1,&x,&y,0,0);
 30:   PetscLogEventEnd(e1,&x,&y,0,0);
 31:   PetscLogEventBegin(e1,&y,0,0,0);
 32:   PetscLogEventEnd(e1,&y,0,0,0);
 33:   PetscLogEventBegin(e1,&x,0,0,0);
 34:   PetscLogEventEnd(e1,&x,0,0,0);
 35:   PetscLogEventBegin(e1,&x,&y,0,0);
 36:   PetscLogEventEnd(e1,&x,&y,0,0);
 37:   PetscLogEventBegin(e1,&y,0,0,0);
 38:   PetscLogEventEnd(e1,&y,0,0,0);
 39:   PetscLogEventBegin(e1,&x,&e1,0,0);
 40:   PetscLogEventEnd(e1,&x,&e1,0,0);

 42:   PetscTime(&y);
 43:   fprintf(stderr,"%-15s : %e sec, with options : ","PetscLogEvent",(y-x)/10.0);

 45:   PetscOptionsHasName(NULL,"-log",&flg);
 46:   if (flg) fprintf(stderr,"-log ");
 47:   PetscOptionsHasName(NULL,"-log_all",&flg);
 48:   if (flg) fprintf(stderr,"-log_all ");
 49:   PetscOptionsHasName(NULL,"-log_view",&flg);
 50:   if (flg) fprintf(stderr,"-log_view ");
 51:   PetscOptionsHasName(NULL,"-log_mpe",&flg);
 52:   if (flg) fprintf(stderr,"-log_mpe ");

 54:   fprintf(stderr,"\n");

 56:   PetscFinalize();
 57:   return ierr;
 58: }