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MPI_Graph_get - Retrieves graph topology information associated with
a communicator.
#include <mpi.h>
int MPI_Graph_get(MPI_Comm comm, int maxindex, int maxedges,
int *index, int *edges)
INCLUDE ’mpif.h’
MPI_GRAPH_GET(COMM, MAXINDEX, MAXEDGES, INDEX, EDGES, IERROR)
INTEGER COMM, MAXINDEX, MAXEDGES, INDEX(*)
INTEGER EDGES(*), IERROR
#include <mpi.h>
void Graphcomm::Get_topo(int maxindex, int maxedges,
int index[], int edges[]) const
- 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).
- 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).
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.
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_Graph_create
MPI_Graphdims_get
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