petsc-3.9.4 2018-09-11

PetscCommSharedGlobalToLocal

Given a global rank returns the local rank in the shared communicator

#include "petscsys.h"   
PetscErrorCode  PetscCommSharedGlobalToLocal(PetscCommShared scomm,PetscMPIInt grank,PetscMPIInt *lrank)

Collective on comm.

	scomm	- the shared memory communicator object
	grank	- the global rank

lrank -the local rank, or -1 if it does not exist

When used with MPICH, MPICH must be configured with --download-mpich-device=ch3:nemesis

Developer Notes: Assumes the scomm->ranks[] is sorted

It may be better to rewrite this to map multiple global ranks to local in the same function call

developer