Intracomm and Intercomm

public class Intracomm extends Comm {

  public Object clone() { ... }

  public Intracomm create(Group group) {...}

  public Intracomm split(int colour, int key) {...}

  // Collective communication

  public void barrier() {...}

  public void bcast(Object buffer, int offset, int count,
                    Datatype datatype, int root) {...}

  public void gather(Object sendbuf, int sendoffset,
                     int sendcount, Datatype sendtype,
                     Object recvbuf, int recvoffset,
                     int recvcount, Datatype recvtype, int root) {...}

  public void gatherv(Object sendbuf, int sendoffset,
                      int sendcount, Datatype sendtype,
                      Object recvbuf, int recvoffset,
                      int [] recvcount, int [] displs,
                      Datatype recvtype, int root) {...}

  public void scatter(Object sendbuf, int sendoffset,
                      int sendcount, Datatype sendtype,
                      Object recvbuf, int recvoffset,
                      int recvcount, Datatype recvtype, int root) {...}

  public void scatterv(Object sendbuf, int sendoffset,
                       int [] sendcount, int [] displs,
                       Datatype sendtype,
                       Object recvbuf, int recvoffset,
                       int recvcount, Datatype recvtype, int root) {...}

  public void allgather(Object sendbuf, int sendoffset,
                        int sendcount, Datatype sendtype,
                        Object recvbuf, int recvoffset,
                        int recvcount, Datatype recvtype) {...}

  public void allgatherv(Object sendbuf, int sendoffset,
                         int sendcount, Datatype sendtype,
                         Object recvbuf, int recvoffset,
                         int [] recvcounts, int [] displs,
                         Datatype recvtype) {...}

  public void alltoall(Object sendbuf, int sendoffset,
                       int sendcount, Datatype sendtype,
                       Object recvbuf, int recvoffset,
                       int recvcount, Datatype recvtype) {...}

  public void alltoallv(Object sendbuf, int sendoffset,
                        int [] sendcount, int [] sdispls,
                        Datatype sendtype,
                        Object recvbuf, int recvoffset,
                        int [] recvcount, int [] rdispls,
                        Datatype recvtype) {...}

  public void reduce(Object sendbuf, int sendoffset,
                     Object recvbuf, int recvoffset,
                     int count, Datatype datatype,
                     Op op, int root) {...}

  public void allreduce(Object sendbuf, int sendoffset,
                        Object recvbuf, int recvoffset,
                        int count, Datatype datatype,
                        Op op) {...}

  public void reduceScatter(Object sendbuf, int sendoffset,
                            Object recvbuf, int recvoffset,
                            int [] recvcounts, Datatype datatype,
                            Op op) {...}

  public void scan(Object sendbuf, int sendoffset,
                   Object recvbuf, int recvoffset,
                   int count, Datatype datatype,
                   Op op) {...}


  // Topology Constructors

  public Graphcomm createGraph(int [] index, int [] edges,
                               boolean reorder) {...}

  public Cartcomm createCart(int [] dims, boolean [] periods,
                             boolean reorder) {...}

  ...
}

public class Intercomm extends Comm {

  public Object clone() { ... }

  // Inter-communication

  public int remoteSize() {...}

  public Group remoteGroup() {...}

  public Intracomm merge(boolean high) {...}

  ...
}