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Man Pages


Manual Reference Pages  -  MPI_GRAPHDIMS_GET (3)

NAME

MPI_Graphdims_get - Retrieves graph topology information associated with a communicator.

CONTENTS

Syntax
C Syntax
Fortran Syntax
C++ Syntax
Input Parameter
Output Parameters
Description
Errors
See Also

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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1.10.2 MPI_GRAPHDIMS_GET (3) Jan 21, 2016

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