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

group, mpjdevComm

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.Object	clone() Clone the communicator This method will be called only by intracommunicator ....
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.
int	Topo_test() Returns the type of topology associated with the communicator.

Methods inherited from class mpi.Intracomm

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

Methods inherited from class mpi.Comm

Abort, Attr_delete, Attr_get, Bsend_init, Bsend, bsend, Create_intercomm, Free, Group, Ibsend, ibsend, Iprobe, Irecv, irecv, Irsend, irsend, Isend, isend, Issend, issend, Pack_size, Pack, Probe, Rank, Recv_init, Recv, recv, Rsend_init, Rsend, rsend, Send_init, Send, send, Sendrecv_replace, sendrecv, Sendrecv, Size, Ssend_init, Ssend, ssend, Test_inter, Unpack

Methods inherited from class java.lang.Object

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

Method Detail

clone

public java.lang.Object clone()
                       throws MPIException

Description copied from class: Intracomm

Clone the communicator This method will be called only by intracommunicator .... changed the return value to Intracomm ...(instead of Object) ...

Overrides:

clone in class Intracomm

Throws:

MPIException

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.

Throws:

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.

Throws:

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.

Throws:

MPIException

Topo_test

public int Topo_test()
              throws MPIException

Description copied from class: Comm

Returns the type of topology associated with the communicator.

returns:

topology type of communicator

Java binding of the MPI operation MPI_TOPO_TEST.

The return value will be one of MPI.GRAPH, MPI.CART or MPI.UNDEFINED.

Overrides:

Topo_test in class Comm

Throws:

MPIException