# 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 "petsc.h"
    PetscErrorCode PETSC_DLLEXPORT 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.

### See Also

PetscSplitOwnership()

Level:developer
Location:src/sys/src/utils/psplit.c
Index of all Sys routines
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