Gather-to-all

void Intracomm.Allgather(Object sendbuf, int sendoffset,
                         int sendcount, Datatype sendtype,
                         Object recvbuf, int recvoffset,
                         int recvcount, Datatype recvtype)

sendbuf	send buffer array
sendoffset	initial offset in send buffer
sendcount	number of items sent to each process
sendtype	datatype of send buffer items
recvbuf	receive buffer array
recvoffset	initial offset in receive buffer
recvcount	number of items in receive buffer
recvtype	datatype of receive buffer items

Similar to Gather, but all processes receive the result. Java binding of the MPI operation MPI_ALLGATHER.

void Intracomm.Allgatherv(Object sendbuf, int sendoffset,
                          int sendcount, Datatype sendtype,
                          Object recvbuf, int recvoffset,
                          int [] recvcounts, int [] displs,
                          Datatype recvtype)

sendbuf	send buffer array
sendoffset	initial offset in send buffer
sendcount	number of items to send
sendtype	datatype of each item in send buffer
recvbuf	receive buffer array
recvoffset	initial offset in receive buffer
recvcounts	number of elements received from each process
displs	displacements at which to place incoming data
recvtype	datatype of each item in receive buffer

Similar to Gatherv, but all processes receive the result. Java binding of the MPI operation MPI_GATHERV.