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Signed-off-by: Fangcong Yin <fyin2@nd.edu> Convert MPI_Graph_create.3in - MPI_Group_intersection.3in to md files Update ompi/mpi/man/man3/MPI_Grequest_complete.md Signed-off-by: Fangcong Yin <fyin2@nd.edu> Co-authored-by: Jeff Squyres <jsquyres@users.noreply.github.com> Update ompi/mpi/man/man3/MPI_Group_excl.md Signed-off-by: Fangcong Yin <fyin2@nd.edu> Co-authored-by: Jeff Squyres <jsquyres@users.noreply.github.com>
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Name
MPI_Graphdims_get - Retrieves graph topology information associated
with a communicator.
Syntax
C Syntax
#include <mpi.h>
int MPI_Graphdims_get(MPI_Comm comm, int *nnodes, int *nedges)
Fortran Syntax
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_GRAPHDIMS_GET(COMM, NNODES, NEDGES, IERROR)
INTEGER COMM, NNODES, NEDGES, IERROR
Fortran 2008 Syntax
USE mpi_f08
MPI_Graphdims_get(comm, nnodes, nedges, ierror)
TYPE(MPI_Comm), INTENT(IN) :: comm
INTEGER, INTENT(OUT) :: nnodes, nedges
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
Input Parameter
comm: Communicator for group with graph structure (handle).
Output Parameters
nnodes: Number of nodes in graph (integer).nedges: Number of edges in graph (integer).IERROR: Fortran only: Error status (integer).
Description
Functions MPI_Graphdims_get and MPI_Graph_get retrieve the
graph-topology information that was associated with a communicator by
MPI_Graph_create.
The information provided by MPI_Graphdims_get can be used to dimension
the vectors index and edges correctly for a call to MPI_Graph_get.
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.