petsc-3.7.5 2017-01-01

PetscSplitOwnershipBlock

Given a global (or local) length determines a local (or global) length via a simple formula. Splits so each processors local size is divisible by the block size.

Synopsis

#include "petscsys.h" 
PetscErrorCode  PetscSplitOwnershipBlock(MPI_Comm comm,PetscInt bs,PetscInt *n,PetscInt *N)

Collective on MPI_Comm (if N is PETSC_DECIDE)

Input Parameters

	comm	- MPI communicator that shares the object being divided
	bs	- block size
	n	- local length (or PETSC_DECIDE to have it set)
	N	- global length (or PETSC_DECIDE)

Notes

n and N cannot be both PETSC_DECIDE

If one processor calls this with N of PETSC_DECIDE then all processors must, otherwise the program will hang.

PetscSplitOwnershipBlock

Synopsis

Input Parameters

Notes

See Also