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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
- comm
- Communicator.
- group
- Group in communicator
(handle).
- IERROR
- 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.
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