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MPI_Comm_create
Langue: en
Version: Mar 18, 2009 (fedora - 06/07/09)
Section: 3 (Bibliothèques de fonctions)
Sommaire
NAME
MPI_Comm_create - Creates a new communicator.SYNTAX
C Syntax
#include <mpi.h> int MPI_Comm_create(MPI_Comm comm, MPI_Group group, MPI_Comm *newcomm)
Fortran Syntax
INCLUDE 'mpif.h' MPI_COMM_CREATE(COMM, GROUP, NEWCOMM, IERROR) INTEGER COMM, GROUP, NEW, IERROR
C++ Syntax
#include <mpi.h> MPI::Intercomm MPI::Intercomm::Create(const Group& group) const MPI::Intracomm MPI::Intracomm::Create(const Group& group) const
INPUT PARAMETER
- comm
- Communicator (handle).
- group
- Group, which is a subset of the group of comm (handle).
OUTPUT PARAMETERS
- newcomm
- New communicator (handle).
- IERROR
- Fortran only: Error status (integer).
DESCRIPTION
This function creates a new communicator newcomm with communication group defined by group and a new context. The function sets newcomm to a new communicator that spans all the processes that are in the group. It sets newcomm to MPI_COMM_NULL for processes that are not in the group. The call is erroneous if not all group arguments have the same value, or if group is not a subset of the group associated with comm. Note that the call must be executed by all processes in comm, even if they do not belong to the new group.NOTES
MPI_Comm_create provides a means of making a subset of processes for the purpose of separate MIMD computation, with separate communication space. newcomm, which is created by MPI_Comm_create, can be used in subsequent calls to MPI_Comm_create (or other communicator constructors) to further subdivide a computation into parallel sub-computations. A more general service is provided by MPI_Comm_split.ERRORS
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.
SEE ALSO
MPI_Comm_split
MPI_Intercomm_create
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