17.2.185. MPI_Group_excl
MPI_Group_excl - Produces a group by reordering an existing group and taking only unlisted members.
17.2.185.1. Syntax
17.2.185.1.1. C Syntax
#include <mpi.h>
int MPI_Group_excl(MPI_Group group, int n, const int ranks[],
MPI_Group *newgroup)
17.2.185.1.2. Fortran Syntax
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_GROUP_EXCL(GROUP, N, RANKS, NEWGROUP, IERROR)
INTEGER GROUP, N, RANKS(*), NEWGROUP, IERROR
17.2.185.1.3. Fortran 2008 Syntax
USE mpi_f08
MPI_Group_excl(group, n, ranks, newgroup, ierror)
TYPE(MPI_Group), INTENT(IN) :: group
INTEGER, INTENT(IN) :: n, ranks(n)
TYPE(MPI_Group), INTENT(OUT) :: newgroup
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
17.2.185.2. Input Parameters
group : Group (handle).
n : Number of elements in array ranks (integer).
ranks : Array of integer ranks in group not to appear in newgroup.
17.2.185.3. Output Parameters
newgroup : New group derived from above, preserving the order defined by group (handle).
IERROR : Fortran only: Error status (integer).
17.2.185.4. Description
The function MPI_Group_excl creates a group of processes newgroup that is obtained by deleting from group those processes with ranks ranks[0], … ranks[n-1]. The ordering of processes in newgroup is identical to the ordering in group. Each of the n elements of ranks must be a valid rank in group and all elements must be distinct; otherwise, the call is erroneous. If n = 0, then newgroup is identical to group.
17.2.185.5. Note
Currently, each of the ranks to exclude must be a valid rank in the group and all elements must be distinct or the function is erroneous. This restriction is per the draft.
17.2.185.6. Errors
Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument.
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