MPI_Isend

Arguments

value

The value to be sent to the specified node.

node

The node to send the data

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.

res

The result of the operation (true if success, false if failed). If the optional argument "comm" is given, all nodes which are not in the communicator will return false.

Description

Send a variable to a specified node in a nonblock (asynchronous) way. The value should be retrieved by the node with the function MPI_Irecv.

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_Irecv — Nonblocking reception of data from a node
• MPI_Wait — Waits for an MPI request to complete