PetscShmCommGet#
Returns a sub-communicator of all ranks that share a common memory
Synopsis#
#include "petscsys.h"
PetscErrorCode PetscShmCommGet(MPI_Comm globcomm, PetscShmComm *pshmcomm)
Collective.
Input Parameter#
globcomm -
MPI_Comm, which can be a user MPI_Comm or a PETSc inner MPI_Comm
Output Parameter#
pshmcomm - the PETSc shared memory communicator object
Note#
When used with MPICH, MPICH must be configured with –download-mpich-device=ch3:nemesis
See Also#
PetscShmCommGlobalToLocal(), PetscShmCommLocalToGlobal(), PetscShmCommGetMpiShmComm()
Level#
developer
Location#
Index of all Sys routines
Table of Contents for all manual pages
Index of all manual pages