mpi_group_compare(3openmpi) [osx man page]

MPI_Group_compare(3OpenMPI)											       MPI_Group_compare(3OpenMPI)

NAME

       MPI_Group_compare  - Compares two groups.

SYNTAX

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

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_GROUP_COMPARE(GROUP1, GROUP2, RESULT, IERROR)
	    INTEGER   GROUP1, GROUP2, RESULT, IERROR

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

INPUT PARAMETERS

       group1	 First group (handle).

       group2	 Second group (handle).

OUTPUT PARAMETERS

       result	 Integer which is MPI_IDENT if the order and members of the two groups are the same, MPI_SIMILAR if only the members are the same,
		 and MPI_UNEQUAL otherwise.

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       MPI_IDENT results if the group members and group order is exactly the same in both groups. This happens for instance if group1  and  group2
       are the same handle. MPI_SIMILAR results if the group members are the same but the order is different. MPI_UNEQUAL results otherwise.

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_compare(3OpenMPI)

MPI_Group_intersection(3OpenMPI)										  MPI_Group_intersection(3OpenMPI)

NAME

       MPI_Group_intersection  - Produces a group at the intersection of two existing groups.

SYNTAX

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

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

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

INPUT PARAMETERS

       group1	 First group (handle).

       group2	 Second group (handle).

OUTPUT PARAMETERS

       newgroup  Intersection 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_intersection(3OpenMPI)