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<HTML>
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<HEAD>
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<META NAME="GENERATOR" CONTENT="DOCTEXT">
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<TITLE>MPI_Graph_map</TITLE>
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</HEAD>
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<BODY BGCOLOR="FFFFFF">
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MPI_Graph_map
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Maps process to graph topology information
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Synopsis
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int MPI_Graph_map(MPI_Comm comm, int nnodes, const int indx[], const int edges[],
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int *newrank)
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Input Parameters
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comm input communicator (handle)
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nnodes number of graph nodes (integer)
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indx integer array specifying the graph structure, see <tt>MPI_GRAPH_CREATE</tt>
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edges integer array specifying the graph structure
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Output Parameters
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- newrank
- reordered rank of the calling process; <tt>MPI_UNDEFINED</tt> if the
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calling process does not belong to graph (integer)
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Thread and Interrupt Safety
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This routine is both thread- and interrupt-safe.
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This means that this routine may safely be used by multiple threads and
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from within a signal handler.
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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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