PETSc version 3.17.5
PetscCommGetComm
get an MPI communicator from a PETSc communicator that can be passed off to another package
Synopsis
#include "petscsys.h"
PetscErrorCode PetscCommGetComm(MPI_Comm comm_in,MPI_Comm *comm_out)
Collective
Input Parameter
| comm_in | - Input communicator
|
Output Parameters
| comm_out | - Output communicator
|
Notes
Use PetscCommRestoreComm() to return the communicator when the external package no longer needs it
Certain MPI implementations have MPI_Comm_free() that do not work, thus one can run out of available MPI communicators causing
mysterious crashes in the code after running a long time. This routine allows reusing previously obtained MPI communicators that
are no longer needed.
See Also
PetscObjectGetNewTag(), PetscCommGetNewTag(), PetscCommDestroy(), PetscCommRestoreComm()
Level
developer
Location
src/sys/objects/tagm.c
Index of all Sys routines
Table of Contents for all manual pages
Index of all manual pages