DA memory consumption

[Denis Teplyashin]

Hi guys,

I'm a bit confused with distributed array memory consumption. I did a 
simple test like this one:
  ierr = DACreate3d(PETSC_COMM_WORLD, DA_NONPERIODIC, DA_STENCIL_BOX, 
1000, 1000, 1000, PETSC_DECIDE, PETSC_DECIDE, PETSC_DECIDE, 1, 1, 
PETSC_NULL, PETSC_NULL, PETSC_NULL , &da);
and then checked memory with PetscMemoryGetCurrentUsage and 
PetscMemoryGetMaximumUsage. Running this test using mpi on one core 
gives me this result: current usage 3818Mb and maximum usage 7633Mb. And 
this is the result after creating just a DA without actual vectors. 
Running the same test on two cores gives me even more interesting 
result: rank 0 - 9552/11463Mb and rank 1 - 5735/5732Mb.
Is it what i should expect in general or am i doing something wrong? Is 
there a simple formula which could show how much memory i would need to 
allocate and array with given resolution?

Thanks in advance,
Denis