petsc-dev 2014-04-23
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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.

See Also

PetscSplitOwnership()

Level:developer
Location:
src/sys/utils/psplit.c
Index of all Sys routines
Table of Contents for all manual pages
Index of all manual pages