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MPI_Graphdims_get(3) man page (version 1.8.1)

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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


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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