#include <petscvec.h>
#include <petsctime.h>

int main(int argc,char **argv)
{
  Vec            x;
  PetscReal      norm;
  PetscLogDouble t1,t2;
  PetscErrorCode ierr;
  PetscInt       n = 10000;

  ierr = PetscInitialize(&argc,&argv,0,0);if (ierr) return ierr;
  ierr = PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);CHKERRQ(ierr);

  ierr = VecCreate(PETSC_COMM_SELF,&x);CHKERRQ(ierr);
  ierr = VecSetSizes(x,n,n);CHKERRQ(ierr);
  ierr = VecSetFromOptions(x);CHKERRQ(ierr);

  PetscPreLoadBegin(PETSC_TRUE,"VecNorm");
  ierr = PetscTime(&t1);CHKERRQ(ierr);
  ierr = VecNorm(x,NORM_2,&norm);CHKERRQ(ierr);
  ierr = VecNorm(x,NORM_2,&norm);CHKERRQ(ierr);
  ierr = VecNorm(x,NORM_2,&norm);CHKERRQ(ierr);
  ierr = VecNorm(x,NORM_2,&norm);CHKERRQ(ierr);
  ierr = VecNorm(x,NORM_2,&norm);CHKERRQ(ierr);
  ierr = VecNorm(x,NORM_2,&norm);CHKERRQ(ierr);
  ierr = VecNorm(x,NORM_2,&norm);CHKERRQ(ierr);
  ierr = VecNorm(x,NORM_2,&norm);CHKERRQ(ierr);
  ierr = VecNorm(x,NORM_2,&norm);CHKERRQ(ierr);
  ierr = VecNorm(x,NORM_2,&norm);CHKERRQ(ierr);
  PetscPreLoadEnd();
  ierr = PetscTime(&t2);CHKERRQ(ierr);
  fprintf(stdout,"%s : \n","VecNorm");
  fprintf(stdout," Time %g\n",t2-t1);
  ierr = PetscFinalize();
  return ierr;
}