Produces a group by reordering an existing group and taking only unlisted members
int MPI_Group_excl ( group, n, ranks, newgroup )
MPI_Group group, *newgroup;
int n, *ranks;
- group - group (handle)
- n - number of elements in array ranks (integer)
- ranks - array of integer ranks in group not to appear in newgroup
- newgroup - new group derived from above, preserving the order defined by
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.
Notes for Fortran
All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK) have
an additional argument ierr at the end of the argument list. ierr
is an integer and has the same meaning as the return value of the routine
in C. In Fortran, MPI routines are subroutines, and are invoked with the
All MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type INTEGER
All MPI routines (except MPI_Wtime and MPI_Wtick) return an error value;
C routines as the value of the function and Fortran routines in the last
argument. Before the value is returned, the current MPI error handler is
called. By default, this error handler aborts the MPI job. The error handler
may be changed with MPI_Errhandler_set; the predefined error handler
MPI_ERRORS_RETURN may be used to cause error values to be returned.
Note that MPI does not guarentee that an MPI program can continue past
- MPI_SUCCESS - No error; MPI routine completed successfully.
- MPI_ERR_GROUP - Null group passed to function.
- MPI_ERR_INTERN - This error is returned when some part of the MPICH
implementation is unable to acquire memory.
- MPI_ERR_ARG - Invalid argument. Some argument is invalid and is not
identified by a specific error class (e.g., MPI_ERR_RANK).
- MPI_ERR_RANK - Invalid source or destination rank. Ranks must be between
zero and the size of the communicator minus one; ranks in a receive
(MPI_Recv, MPI_Irecv, MPI_Sendrecv, etc.) may also be MPI_ANY_SOURCE.