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<TITLE>MPI_Graph_create</TITLE>
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MPI_Graph_create
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Makes a new communicator to which topology information has been attached
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Synopsis
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int MPI_Graph_create(MPI_Comm comm_old, int nnodes, const int indx[],
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const int edges[], int reorder, MPI_Comm * comm_graph)
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Input Parameters
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comm_old input communicator without topology (handle)
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nnodes number of nodes in graph (integer)
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indx array of integers describing node degrees (see below)
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edges array of integers describing graph edges (see below)
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reorder ranking may be reordered (true) or not (false) (logical)
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Output Parameters
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comm_graph communicator with graph topology added (handle)
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Notes
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Each process must provide a description of the entire graph, not just the
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neigbors of the calling process.
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Algorithm
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We ignore the <tt>reorder</tt> info currently.
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Thread and Interrupt Safety
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This routine is thread-safe. This means that this routine may be
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safely used by multiple threads without the need for any user-provided
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thread locks. However, the routine is not interrupt safe. Typically,
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this is due to the use of memory allocation routines such as <tt>malloc
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</tt>or other non-MPICH runtime routines that are themselves not interrupt-safe.
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Notes for Fortran
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All MPI routines in Fortran (except for <tt>MPI_WTIME</tt> and <tt>MPI_WTICK</tt>) have
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an additional argument <tt>ierr</tt> at the end of the argument list. <tt>ierr
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</tt>is an integer and has the same meaning as the return value of the routine
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in C. In Fortran, MPI routines are subroutines, and are invoked with the
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<tt>call</tt> statement.
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All MPI objects (e.g., <tt>MPI_Datatype</tt>, <tt>MPI_Comm</tt>) are of type <tt>INTEGER
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</tt>in Fortran.
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Errors
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All MPI routines (except <tt>MPI_Wtime</tt> and <tt>MPI_Wtick</tt>) return an error value;
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C routines as the value of the function and Fortran routines in the last
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argument. Before the value is returned, the current MPI error handler is
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called. By default, this error handler aborts the MPI job. The error handler
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may be changed with <tt>MPI_Comm_set_errhandler</tt> (for communicators),
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<tt>MPI_File_set_errhandler</tt> (for files), and <tt>MPI_Win_set_errhandler</tt> (for
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RMA windows). The MPI-1 routine <tt>MPI_Errhandler_set</tt> may be used but
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its use is deprecated. The predefined error handler
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<tt>MPI_ERRORS_RETURN</tt> may be used to cause error values to be returned.
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Note that MPI does not guarentee that an MPI program can continue past
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an error; however, MPI implementations will attempt to continue whenever
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possible.
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MPI_SUCCESS No error; MPI routine completed successfully.
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MPI_ERR_TOPOLOGY Invalid topology. Either there is no topology
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associated with this communicator, or it is not the correct type (e.g.,
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<tt>MPI_CART</tt> when expecting <tt>MPI_GRAPH</tt>).
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MPI_ERR_COMM Invalid communicator. A common error is to use a null
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communicator in a call (not even allowed in <tt>MPI_Comm_rank</tt>).
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MPI_ERR_ARG Invalid argument. Some argument is invalid and is not
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identified by a specific error class (e.g., <tt>MPI_ERR_RANK</tt>).
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