MPI_Comm_group(3) Open MPI MPI_Comm_group(3)

MPI_Comm_group - Returns the group associated with a communicator.

#include <mpi.h>
int MPI_Comm_group(MPI_Comm comm, MPI_Group *group)

USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_COMM_GROUP(COMM, GROUP, IERROR)

INTEGER COMM, GROUP, IERROR

USE mpi_f08
MPI_Comm_group(comm, group, ierror)
	TYPE(MPI_Comm), INTENT(IN) :: comm
	TYPE(MPI_Group), INTENT(OUT) :: group
	INTEGER, OPTIONAL, INTENT(OUT) :: ierror

#include <mpi.h>
Group Comm::Get_group() const

Communicator.

Group in communicator (handle).
Fortran only: Error status (integer).

If the communicator is an intercommunicator (enables communication between two groups of processes), this function returns the local group. To return the remote group, use the MPI_Comm_remote_group function.

Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ functions do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism will be used to throw an MPI::Exception object.

Before the error value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job, except for I/O function errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error.

May 26, 2022 4.1.4