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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