MPI_Graph_map

Maps process to graph topology information

Synopsis

#include "mpi.h"
int MPI_Graph_map ( MPI_Comm comm_old, int nnodes, int *index, int *edges, 
                   int *newrank )

Input Parameters

	comm	input communicator (handle)
	nnodes	number of graph nodes (integer)
	index	integer array specifying the graph structure, see MPI_GRAPH_CREATE
	edges	integer array specifying the graph structure

Output Parameter

newrank

reordered rank of the calling process; MPI_UNDEFINED if the calling process does not belong to graph (integer)

Notes for Fortran

All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK) have an additional argument ierr at the end of the argument list. ierr is an integer and has the same meaning as the return value of the routine in C. In Fortran, MPI routines are subroutines, and are invoked with the call statement.

All MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type INTEGER in Fortran.

Errors

All MPI routines (except MPI_Wtime and MPI_Wtick) return an error value; C routines as the value of the function and Fortran routines in the last argument. Before the value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job. The error handler may be changed with MPI_Errhandler_set; the predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarentee that an MPI program can continue past an error.

MPI_SUCCESS

No error; MPI routine completed successfully.

MPI_ERR_TOPOLOGY

Invalid topology. Either there is no topology associated with this communicator, or it is not the correct type (e.g., MPI_CART when expecting MPI_GRAPH).

MPI_ERR_COMM

Invalid communicator. A common error is to use a null communicator in a call (not even allowed in MPI_Comm_rank).

MPI_ERR_ARG

Invalid argument. Some argument is invalid and is not identified by a specific error class (e.g., MPI_ERR_RANK).

Location:graph_map.c