xref: /petsc/src/benchmarks/PetscMalloc.c (revision 8563dfcc547dae59d5e1dc6b8e602db41cb72b14)

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

#undef __FUNCT__
#define __FUNCT__ "main"
int main(int argc,char **argv)
{
  PetscLogDouble x,y;
  double         value;
  void           *arr[1000],*dummy;
  int            ierr,i,rand1[1000],rand2[1000];
  PetscRandom    r;
  PetscBool      flg;

  PetscInitialize(&argc,&argv,0,0);

  ierr = PetscRandomCreate(PETSC_COMM_SELF,&r);CHKERRQ(ierr);
  ierr = PetscRandomSetFromOptions(r);CHKERRQ(ierr);
  for (i=0; i<1000; i++) {
    ierr     = PetscRandomGetValue(r,&value);CHKERRQ(ierr);
    rand1[i] = (int)(value* 144327);
    ierr     = PetscRandomGetValue(r,&value);CHKERRQ(ierr);
    rand2[i] = (int)(value* 144327);
  }

  /* Take care of paging effects */
  ierr = PetscMalloc(100,&dummy);CHKERRQ(ierr);
  ierr = PetscFree(dummy);CHKERRQ(ierr);
  ierr = PetscTime(&x);CHKERRQ(ierr);

  /* Do all mallocs */
  for (i=0; i< 1000; i++) {
    ierr = PetscMalloc(rand1[i],&arr[i]);CHKERRQ(ierr);
  }

  ierr = PetscTime(&x);CHKERRQ(ierr);

  /* Do some frees */
  for (i=0; i< 1000; i+=2) {
    ierr = PetscFree(arr[i]);CHKERRQ(ierr);
  }

  /* Do some mallocs */
  for (i=0; i< 1000; i+=2) {
    ierr = PetscMalloc(rand2[i],&arr[i]);CHKERRQ(ierr);
  }
  ierr = PetscTime(&y);CHKERRQ(ierr);

  for (i=0; i< 1000; i++) {
    ierr = PetscFree(arr[i]);CHKERRQ(ierr);
  }

  fprintf(stdout,"%-15s : %e sec, with options : ","PetscMalloc",(y-x)/500.0);
  ierr = PetscOptionsHasName(NULL,"-malloc",&flg);CHKERRQ(ierr);
  if (flg) fprintf(stdout,"-malloc ");
  fprintf(stdout,"\n");

  ierr = PetscRandomDestroy(&r);CHKERRQ(ierr);
  ierr = PetscFinalize();
  PetscFunctionReturn(0);
}