petsc-3.9.4 2018-09-11

PetscCommSharedGet

Given a PETSc communicator returns a communicator of all ranks that shared a common memory

#include "petscsys.h"   
PetscErrorCode  PetscCommSharedGet(MPI_Comm comm,PetscCommShared *scomm)

Collective on comm.

comm -MPI_Comm

scomm -the shared memory communicator object

Notes: This should be called only with an PetscCommDuplicate() communictor

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

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