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So.. the code above is something I think it should've worked but it's bugging (by bugging i mean that rank 0 is expecting the messages
and the other ranks are waiting for them to be received but that never happens).
What I tried to do was something like this:
if(rank == 0){ for (a = 0; a < 100; a++){ MPI_Recv(&buff, 1, MPI_INT, MPI_ANY_SOURCE, a+100; MPI_COMM_WORLD, &status); MPI_Recv(&buff2, 1, MPI_INT, MPI_ANY_SOURCE, a+100; MPI_COMM_WORLD, &status); MPI_Recv(&buff3, 1, MPI_INT, MPI_ANY_SOURCE, a+100; MPI_COMM_WORLD, &status); } }else{ // Receive id that goes from 0 to 99. line 2. MPI_Recv(&id, 1, MPI_INT, 1, RECEIVEID, MPI_COMM_WORLD, &status); MPI_Request requestNull; MPI_Isend(&buff4, 1, MPI_INT, 0, id+100, MPI_COMM_WORLD, &requestNull); MPI_Isend(&buff5, 1, MPI_INT, 0, id+100, MPI_COMM_WORLD, &requestNull); MPI_Isend(&buff6, 1, MPI_INT, 0, id+100, MPI_COMM_WORLD, &requestNull); }
I already did something like this as well and it didn't work..
MPI_Request request[3]; MPI_Status status[3]; MPI_Isend(&buff4, 1, MPI_INT, 0, id+100, MPI_COMM_WORLD, &request[0]]); MPI_Isend(&buff5, 1, MPI_INT, 0, id+100, MPI_COMM_WORLD, &request[1]); MPI_Isend(&buff6, 1, MPI_INT, 0, id+100, MPI_COMM_WORLD, &request[2]); MPI_Waitall(3, request, status);
So.. any help?
Thanks in advance!
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You are doing blocking receives on all nodes. SO unless they receive something the next instruction won't proceed.
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