petsc-3.13.6 2020-09-29
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 (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