mpi
Class Graphcomm

java.lang.Object
  |
  +--mpi.Comm
        |
        +--mpi.Intracomm
              |
              +--mpi.Graphcomm

public class Graphcomm

extends Intracomm

Field Summary

Fields inherited from class mpi.Comm

handle, nullHandle, SELF, WORLD

Constructor Summary

protected

Graphcomm(long handle)

Method Summary

java.lang.Object	clone() Duplicate this communicator.
GraphParms	Get() Returns graph topology information.
int	Map(int[] index, int[] edges) Compute an optimal placement.
int[]	Neighbours(int rank) Provides adjacency information for general graph topology.

Methods inherited from class mpi.Intracomm

Allgather, Allgatherv, Allreduce, Alltoall, Alltoallv, Barrier, Bcast, Creat, Create_cart, Create_graph, Gather, Gatherv, Reduce_scatter, Reduce, Scan, Scatter, Scatterv, Split

Methods inherited from class mpi.Comm

Abort, Attr_get, Bsend_init, Bsend, Compare, Create_intercomm, dup, Errhandler_set, Errorhandler_get, Free, GetIntercomm, Group, Ibsend, Ibsend, Iprobe, Irecv, Irecv, Irsend, Irsend, Is_null, Isend, Isend, Issend, Issend, Object_Deserialize, Object_Serialize, Pack_size, Pack, Probe, Rank, Recv_init, Recv, Rsend_init, Rsend, Send_init, Send, Sendrecv_replace, Sendrecv, Size, Ssend_init, Ssend, Test_inter, Topo_test, Unpack

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Graphcomm

protected Graphcomm(long handle)
             throws MPIException

Method Detail

clone

public java.lang.Object clone()

Description copied from class: Comm

Duplicate this communicator.

returns:

copy of this communicator

Java binding of the MPI operation MPI_COMM_DUP.

The new communicator is ``congruent'' to the old one, but has a different context.

Overrides:

clone in class Intracomm

Get

public GraphParms Get()
               throws MPIException

Returns graph topology information.

returns:

object defining node degress and edges of graph

Java binding of the MPI operation MPI_GRAPHDIMS_GET.

The number of nodes and number of edges can be extracted from the sizes of the index and edges fields of the returned object.

MPIException

Neighbours

public int[] Neighbours(int rank)
                 throws MPIException

Provides adjacency information for general graph topology.

rank	rank of a process in the group of this communicator
returns:	array of ranks of neighbouring processes to one specified

Java binding of the MPI operations MPI_GRAPH_NEIGHBOURS_COUNT and MPI_GRAPH_NEIGHBOURS.

The number of neighbours can be extracted from the size of the result.

MPIException

Map

public int Map(int[] index,
               int[] edges)
        throws MPIException

Compute an optimal placement.

index	node degrees
edges	graph edges
returns:	reordered rank of calling process

Java binding of the MPI operation MPI_GRAPH_MAP.

The number of nodes is taken to be size of the index argument.

MPIException