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)

Input Parameters

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

Level: developer

Notes

n and N cannot be both PETSC_DECIDE

If one processor calls this with n or N of PETSC_DECIDE 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()

Location:psplit.c