MPI_Group_incl − Produces a group by reordering an existing group and taking only listed members.
#include
<mpi.h>
int MPI_Group_incl(MPI_Group group, int n,
const int ranks[],
MPI_Group *newgroup) |
USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_GROUP_INCL(GROUP, N, RANKS, NEWGROUP, IERROR)
INTEGER |
GROUP, N, RANKS(*), NEWGROUP, IERROR |
USE mpi_f08
MPI_Group_incl(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 |
group |
Group (handle). | ||
n |
Number of elements in array ranks (and size of newgroup)(integer). | ||
ranks |
Ranks of processes in group to appear in newgroup (array of integers). |
newgroup |
New group derived from above, in the order defined by ranks (handle). | ||
IERROR |
Fortran only: Error status (integer). |
The function MPI_Group_incl creates a group group_out that consists of the n processes in group with ranks rank[0], ..., rank[n-1]; the process with rank i in group_out is the process with rank ranks[i] in group. Each of the n elements of ranks must be a valid rank in group and all elements must be distinct, or else the program is erroneous. If n = 0, then group_out is MPI_GROUP_EMPTY. This function can, for instance, be used to reorder the elements of a group.
This implementation does not currently check to ensure that there are no duplicates in the list of ranks.
Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ functions 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.
MPI_Group_compare
MPI_Group_range_incl
MPI_Group_free