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`