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MPI_Graphdims_get
Langue: en
Version: Mar 18, 2009 (fedora - 06/07/09)
Section: 3 (Bibliothèques de fonctions)
Sommaire
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
INCLUDE 'mpif.h' MPI_GRAPHDIMS_GET(COMM, NNODES, NEDGES, IERROR) INTEGER COMM, NNODES, NEDGES, IERROR
C++ Syntax
#include <mpi.h> void Graphcomm::Get dims(int nnodes[], int nedges[]) const
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. 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.
SEE ALSO
MPI_Graph_create
MPI_Graph_get
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