mpi_comm_create(3openmpi) [osx man page]

MPI_Comm_create(3OpenMPI)												 MPI_Comm_create(3OpenMPI)

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 construc-
       tors) 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++ func-
       tions  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

Open MPI 1.2							  September 2006					 MPI_Comm_create(3OpenMPI)

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MPI_Comm_accept(3OpenMPI)												 MPI_Comm_accept(3OpenMPI)

NAME

       MPI_Comm_accept	- Establishes communication with a client.

SYNTAX

C Syntax
       #include <mpi.h>
       int MPI_Comm_accept(char *port_name, MPI_Info info, int root, MPI_Comm comm, MPI_Comm *newcomm)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_COMM_ACCEPT(PORT_NAME, INFO, ROOT, COMM, NEWCOMM, IERROR)
	    CHARACTER*(*)  PORT_NAME
	    INTEGER	   INFO, ROOT, COMM, NEWCOMM, IERROR

C++ Syntax
       #include <mpi.h>
       MPI::Intercomm MPI::Intracomm::Accept(const char* port_name,
	    const MPI::Info& info, int root) const

INPUT PARAMETERS

       port_name Port name (string, used only on root).

       info	 Options given by root for the accept (handle, used only on root). No options currently supported.

       root	 Rank in comm of root node (integer).

       comm	 Intracommunicator over which call is collective (handle).

OUTPUT PARAMETERS

       newcomm	 Intercommunicator with client as remote group (handle)

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       MPI_Comm_accept	establishes  communication  with a client. It is collective over the calling communicator. It returns an intercommunicator
       that allows communication with the client, after the client has connected with the  MPI_Comm_accept  function  using  the  MPI_Comm_connect
       function.

       The port_name must have been established through a call to MPI_Open_port on the root.

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++ func-
       tions 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.

       See the MPI man page for a full list of MPI error codes.

SEE ALSO

       MPI_Comm_connect MPI_Open_port

Open MPI 1.2							    March 2007						 MPI_Comm_accept(3OpenMPI)

Linux and UNIX Man Pages

mpi_comm_create(3openmpi) [osx man page]

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