PetscSplitOwnership#
Given a global (or local) length determines a local (or global) length via a simple formula
Synopsis#
#include "petscsys.h"
PetscErrorCode PetscSplitOwnership(MPI_Comm comm, PetscInt *n, PetscInt *N)
Collective (if n or N is PETSC_DECIDE or PETSC_DETERMINE)
Input Parameters#
comm - MPI communicator that shares the object being divided
n - local length (or
PETSC_DECIDEto have it set)N - global length (or
PETSC_DETERMINEto have it set)
Notes#
n and N cannot be both PETSC_DECIDE and PETSC_DETERMINE
If one processor calls this with n of PETSC_DECIDE (or with N PETSC_DETERMINE) then all processors
must. Otherwise, an error is thrown in debug mode while the program will hang
in optimized (i.e. configured –with-debugging=0) mode.
See Also#
PetscSplitOwnershipBlock(), PetscSplitOwnershipEqual(), PETSC_DECIDE, PETSC_DETERMINE
Level#
developer
Location#
Examples#
src/ksp/ksp/tutorials/bench_kspsolve.c
src/ksp/ksp/tutorials/ex85.c
Index of all Sys routines
Table of Contents for all manual pages
Index of all manual pages