MPI_INTERCOMM_CREATE(3)MPI_INTERCOMM_CREATE(3)NAMEMPI_Intercomm_create - Creates an intercommuncator from two
intracommunicators
SYNOPSIS
C:
#include <mpi.h>
int MPI_Intercomm_create ( local_comm, local_leader,
peer_comm, remote_leader, tag, comm_out )
MPI_Comm local_comm;
int local_leader;
MPI_Comm peer_comm;
int remote_leader;
int tag;
MPI_Comm *comm_out;
C++:
#include <mpi.h>
Intercomm Intracomm::Create_intercomm(
int local_leader,
const Comm& peer_comm,
int remote_leader,
int tag) const
Fortran:
INCLUDE "mpif.h" (or USE MPI)
INTEGER local_comm, local_leader, peer_comm, remote_leader,
tag, newintercomm, ierror
Call MPI_INTERCOMM_CREATE(local_comm, local_leader, peer_comm,
remote_leader, tag, newintercomm, ierror)
STANDARDS
This release implements the MPI 1.2 standard, as documented by the MPI
Forum in the spring 1997 release of MPI: A Message Passing Interface
Standard.
DESCRIPTION
The MPI_Intercomm_create routine creates an intercommunicator from two
intracommunicators. This routine accepts the following parameters:
Page 1
MPI_INTERCOMM_CREATE(3)MPI_INTERCOMM_CREATE(3)
local_comm Specifies a local intracommunicator.
local_leader Specifies the rank in the local communicator (local_comm)
of the leader (often 0).
peer_comm Specifies the remote communicator.
remote_leader Specifies the rank in the remote communicator (peer_comm)
of the leader (often 0).
tag Specifies the message tag to use in constructing the
intercommunicator. If multiple MPI_Intercomm_create
routines are being called, they should use different tags
(more precisely, they should ensure that the local and
remote leaders are using different tags for each
MPI_intercomm_create routine).
comm_out Returns the created intercommunicator.
ierror Specifies the return code value for successful completion,
which is in MPI_SUCCESS. MPI_SUCCESS is defined in the
mpif.h file.
Page 2
