#include <petscsys.h>
#include <petsctime.h>

int main(int argc, char **argv)
{
  PetscLogDouble x, y;
  PetscLogEvent  e1;
  PetscBool      flg;

  PetscCall(PetscInitialize(&argc, &argv, 0, 0));
  PetscLogEventRegister("*DummyEvent", 0, &e1);
  /* To take care of the paging effects */
  PetscCall(PetscTime(&x));
  PetscCall(PetscLogEventBegin(e1, &x, 0, 0, 0));
  PetscCall(PetscLogEventEnd(e1, &x, 0, 0, 0));

  PetscCall(PetscTime(&x));
  /* 10 Occurrences of the dummy event */
  PetscCall(PetscLogEventBegin(e1, &x, 0, 0, 0));
  PetscCall(PetscLogEventEnd(e1, &x, 0, 0, 0));
  PetscCall(PetscLogEventBegin(e1, &x, &y, 0, 0));
  PetscCall(PetscLogEventEnd(e1, &x, &y, 0, 0));
  PetscCall(PetscLogEventBegin(e1, &y, 0, 0, 0));
  PetscCall(PetscLogEventEnd(e1, &y, 0, 0, 0));
  PetscCall(PetscLogEventBegin(e1, &x, 0, 0, 0));
  PetscCall(PetscLogEventEnd(e1, &x, 0, 0, 0));
  PetscCall(PetscLogEventBegin(e1, &x, &y, 0, 0));
  PetscCall(PetscLogEventEnd(e1, &x, &y, 0, 0));
  PetscCall(PetscLogEventBegin(e1, &y, 0, 0, 0));
  PetscCall(PetscLogEventEnd(e1, &y, 0, 0, 0));
  PetscCall(PetscLogEventBegin(e1, &x, 0, 0, 0));
  PetscCall(PetscLogEventEnd(e1, &x, 0, 0, 0));
  PetscCall(PetscLogEventBegin(e1, &x, &y, 0, 0));
  PetscCall(PetscLogEventEnd(e1, &x, &y, 0, 0));
  PetscCall(PetscLogEventBegin(e1, &y, 0, 0, 0));
  PetscCall(PetscLogEventEnd(e1, &y, 0, 0, 0));
  PetscCall(PetscLogEventBegin(e1, &x, &e1, 0, 0));
  PetscCall(PetscLogEventEnd(e1, &x, &e1, 0, 0));

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

  PetscCall(PetscOptionsHasName(NULL, "-log", &flg));
  if (flg) fprintf(stderr, "-log ");
  PetscCall(PetscOptionsHasName(NULL, "-log_all", &flg));
  if (flg) fprintf(stderr, "-log_all ");
  PetscCall(PetscOptionsHasName(NULL, "-log_view", &flg));
  if (flg) fprintf(stderr, "-log_view ");
  PetscCall(PetscOptionsHasName(NULL, "-log_mpe", &flg));
  if (flg) fprintf(stderr, "-log_mpe ");

  fprintf(stderr, "\n");

  PetscCall(PetscFinalize());
  return 0;
}