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NAME
MPI_Graph_get - Retrieves graph topology information associated with a
communicator.
SYNTAX
C Syntax
#include <mpi.h>
int MPI_Graph_get(MPI_Comm comm, int maxindex, int maxedges,
int *index, int *edges)
Fortran Syntax
INCLUDE 'mpif.h'
MPI_GRAPH_GET(COMM, MAXINDEX, MAXEDGES, INDEX, EDGES, IERROR)
INTEGER COMM, MAXINDEX, MAXEDGES, INDEX(*)
INTEGER EDGES(*), IERROR
C++ Syntax
#include <mpi.h>
void Graphcomm::Get_topo(int maxindex, int maxedges,
int index[], int edges[]) const
INPUT PARAMETERS
comm Communicator with graph structure (handle).
maxindex Length of vector index in the calling program (integer).
maxedges Length of vector edges in the calling program (integer).
OUTPUT PARAMETERS
index Array of integers containing the graph structure (for details
see the definition of MPI_Graph_create).
edges Array of integers containing the graph structure.
IERROR Fortran only: Error status (integer).
DESCRIPTION
Functions MPI_Graphdims_get and MPI_Graph_get retrieve the graph-topol-
ogy 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. 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.
SEE ALSO
MPI_Graph_create
MPI_Graphdims_get
Open MPI 1.2 September 2006 MPI_Graph_get(3OpenMPI)
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