MPI_Graph_map

Maps process to graph topology information

Synopsis

#include "mpi.h"
int MPI_Graph_map ( comm_old, nnodes, index, edges, newrank )
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) havean additional argument ierr at the end of the argument list. ierris an integer and has the same meaning as the return value of the routinein C. In Fortran, MPI routines are subroutines, and are invoked with thecall statement.

All MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type INTEGERin 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 lastargument. Before the value is returned, the current MPI error handler iscalled. By default, this error handler aborts the MPI job. The error handlermay be changed with MPI_Errhandler_set; the predefined error handlerMPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarentee that an MPI program can continue pastan 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