MPI_Irecv

Arguments

rank

The rank. TODO

tag

The tag. TODO

comm=mpi_comm

If the optional argument "comm" is given, this function will use the MPI communicator created by MPI_Create_comm. If not, the default MPI_COMM_WORLD is used.

Description

Receive a variable from a specified node in a nonblock (asynchronous) way. The value is usually sent by the function MPI_Isend.

Note that, due to its asynchronous nature, MPI_Irecv does not return any value. The value sent by the source node will be returned by MPI_Wait.

Technical implementation

For more information on the implementation of Scilab/MPI, please see Technical details about the implementation

Examples

MPI_Init();
rnk = MPI_Comm_rank();
sizeNodes = MPI_Comm_size();

SLV = rnk;
Master = ~ SLV;

assert_checkequal(MPI_Comm_size(), 2);

if Master
    for slaveId = 1:sizeNodes-1
        value = slaveId*2
        MPI_Isend(value, slaveId, 42);
    end
else
    rankSource = 0;
    tag = 0;
    MPI_Irecv(rankSource, tag, 42); // MPI_Irecv does not return any value
    value = MPI_Wait(42) // the value will be returned by MPI_Wait
    assert_checkequal(value,2);
end

MPI_Finalize();
exit()

See also

• MPI_Isend — Nonblocking send data from a node to another
• MPI_Wait — Waits for an MPI request to complete