Once you have sent a message, you must receive it on another task. The function \( MPI\_RECV \) is similar to the send call.

int MPI_Recv( void *buf, int count, MPI_Datatype datatype, 
            int source, 
            int tag, MPI_Comm comm, MPI_Status *status )

The arguments that are different from those in MPI\_SEND are buf which is the name of the variable where you will be storing the received data, source which replaces the destination in the send command. This is the return ID of the sender.

Finally, we have used \( MPI\_Status\_status \), where one can check if the receive was completed.

The output of this code is the same as the previous example, but now process 0 sends a message to process 1, which forwards it further to process 2, and so forth.