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

src/sys/utils/mpishm.c

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Index of all Sys routines
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