petsc-3.12.5 2020-03-29
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PetscShmCommGet

 Given a PETSc communicator returns a 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

Output Parameter

pshmcomm -the PETSc 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

Level

developer

Location

src/sys/utils/mpishm.c
Index of all Sys routines
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Index of all manual pages