mpi_group_size(3openmpi) [osx man page]

MPI_Group_size(3OpenMPI)												  MPI_Group_size(3OpenMPI)

NAME

       MPI_Group_size - Returns the size of a group.

SYNTAX

C Syntax
       #include <mpi.h>
       int MPI_Group_size(MPI_Group group, int *size)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_GROUP_SIZE(GROUP, SIZE, IERROR)
	    INTEGER   GROUP, SIZE, IERROR

C++ Syntax
       #include <mpi.h>
       int Group::Get_size() const

INPUT PARAMETERS

       group	 Group (handle).

OUTPUT PARAMETERS

       size	 Number of processes in the group (integer).

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       MPI_Group_size  returns in size the number of processes in the group. Thus, if group = MPI_GROUP_EMPTY, then the call will return size = 0.
       On the other hand, a call with group = MPI_GROUP_NULL is erroneous.

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.

Open MPI 1.2							  September 2006					  MPI_Group_size(3OpenMPI)

MPI_File_get_group(3OpenMPI)											      MPI_File_get_group(3OpenMPI)

NAME

       MPI_File_get_group - Returns a duplicate of the process group of a file.

SYNTAX

       C Syntax
	   #include <mpi.h>
	   int MPI_File_get_group(MPI_File fh, MPI_Group *group)

       Fortran Syntax
	   INCLUDE 'mpif.h'
	   MPI_FILE_GET_GROUP(FH, GROUP,  IERROR)
		  INTEGER    FH, GROUP, IERROR

C++ Syntax
       #include <mpi.h>
       MPI::Group MPI::File::Get_group() const

INPUT PARAMETER

       fh	 File handle (handle).

OUTPUT PARAMETERS

       group	 Group that opened the file (handle).

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       MPI_File_get_group returns a duplicate of the group of the communicator used to open the file associated with fh.  The group is returned in
       group.  The user is responsible for freeing group, using MPI_Group_free.

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. For MPI I/O function errors, the default error handler is  set
       to  MPI_ERRORS_RETURN. The error handler may be changed with MPI_File_set_errhandler; the predefined error handler MPI_ERRORS_ARE_FATAL may
       be used to make I/O errors fatal. Note that MPI does not guarantee that an MPI program can continue past an error.

Open MPI 1.2							  September 2006				      MPI_File_get_group(3OpenMPI)