mpi_group_translate_ranks(3openmpi) [osx man page]

MPI_Group_translate_ranks(3OpenMPI)									       MPI_Group_translate_ranks(3OpenMPI)

NAME

       MPI_Group_translate_ranks - Translates the ranks of processes in one group to those in another group.

SYNTAX

C Syntax
       #include <mpi.h>
       int MPI_Group_translate_ranks(MPI_Group group1, int n,
	    int *ranks1, MPI_Group group2, int *ranks2)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_GROUP_TRANSLATE_RANKS(GROUP1, N, RANKS1, GROUP2, RANKS2,
		 IERROR)
	    INTEGER   GROUP1, N, RANKS1(*), GROUP2, RANKS2(*), IERROR

C++ Syntax
       #include <mpi.h>
       static void Group::Translate_ranks (const Group& group1, int n,
	    const int ranks1[], const Group& group2, int ranks2[])

INPUT PARAMETERS

       group1	 First group (handle).

       n	 Number of ranks in ranks1 and ranks2 arrays (integer).

       ranks1	 Array of zero or more valid ranks in group1.

       group2	 Second group (handle).

OUTPUT PARAMETERS

       ranks2	 Array of corresponding ranks in group2, MPI_UNDEFINED when no correspondence exists.

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       This function is important for determining the relative numbering of the same processes in two different groups. For instance, if one knows
       the ranks of certain processes in the group of MPI_COMM_WORLD, one might want to know their ranks in a subset of that group.

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_translate_ranks(3OpenMPI)

MPI_Group_union(3OpenMPI)												 MPI_Group_union(3OpenMPI)

NAME

       MPI_Group_union	- Produces a group by combining two groups.

SYNTAX

C Syntax
       #include <mpi.h>
       int MPI_Group_union(MPI_Group group1, MPI_Group group2,
	    MPI_Group *newgroup)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_GROUP_UNION(GROUP1, GROUP2, NEWGROUP, IERROR)
	    INTEGER   GROUP1, GROUP2, NEWGROUP, IERROR

C++ Syntax
       #include <mpi.h>
       static Group Group::Union(const Group& group1, const Group& group2)

INPUT PARAMETERS

       group1	 First group (handle).

       group2	 Second group (handle).

OUTPUT PARAMETERS

       newgroup  Union group (handle).

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       The set-like operations are defined as follows:

	 o    union -- All elements of the first group (group1), followed by all elements of second group (group2) not in first.

	 o    intersect -- all elements of the first group that are also in the second group, ordered as in first group.

	 o    difference -- all elements of the first group that are not in the second group, ordered as in the first group.

       Note that for these operations the order of processes in the output group is determined primarily by order in the first group (if possible)
       and then, if necessary, by order in the second group. Neither union nor intersection are commutative, but both are associative.

       The new group can be empty, that is, equal to MPI_GROUP_EMPTY.

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_Group_free

Open MPI 1.2							  September 2006					 MPI_Group_union(3OpenMPI)