56 lines
1.8 KiB
Groff
56 lines
1.8 KiB
Groff
.\" -*- nroff -*-
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.\" Copyright 2010 Cisco Systems, Inc. All rights reserved.
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.\" Copyright 2006-2008 Sun Microsystems, Inc.
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.\" Copyright (c) 1996 Thinking Machines Corporation
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.\" $COPYRIGHT$
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.TH MPI_Graphdims_get 3 "Mar 26, 2019" "4.0.1" "Open MPI"
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.SH NAME
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\fBMPI_Graphdims_get \fP \- Retrieves graph topology information associated with a communicator.
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.SH SYNTAX
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.ft R
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.SH C Syntax
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.nf
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#include <mpi.h>
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int MPI_Graphdims_get(MPI_Comm \fIcomm\fP, int\fI *nnodes\fP, int\fI *nedges\fP)
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.fi
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.SH INPUT PARAMETER
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.ft R
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.TP 1i
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comm
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Communicator for group with graph structure (handle).
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.SH OUTPUT PARAMETERS
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.ft R
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.TP 1i
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nnodes
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Number of nodes in graph (integer).
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.TP 1i
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nedges
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Number of edges in graph (integer).
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.ft R
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.TP 1i
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IERROR
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Fortran only: Error status (integer).
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.SH DESCRIPTION
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.ft R
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Functions MPI_Graphdims_get and MPI_Graph_get retrieve the graph-topology information that was associated with a communicator by MPI_Graph_create.
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.sp
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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.
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.SH ERRORS
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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.
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.sp
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Before the error value is returned, the current MPI error handler is
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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.
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.SH SEE ALSO
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.ft R
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.sp
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MPI_Graph_create
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.br
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MPI_Graph_get
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