Improving MPI_ANY_SOURCE algo

[upperwal]

EntangledMPI/src/mpi/init.c

Lines 1090 to 1097 in 11bf509

	if(source == MPI_ANY_SOURCE) {
	// Very tricky to set.
	// If less and user sends more MPI_Send it will block the program.
	// TODO: Find a better solution for MPI_ANY_SOURCE
	worker_count = 2;
	} else {
	worker_count = job_list[source].worker_count;
	}

Not a good implementation. Will only support 2 nodes (1 compute and 1 replica). Should be more generic.

One way of making it generic it to do one PMPI_Irecv with MPI_ANY_SOURCE and spawn a new thread to PMPI_Wait for this request to complete. Once its complete this thread can check for number of nodes in this job ("n") using status.MPI_SOURCE and rank2job array and do "n - 1" PMPI_Irecv and exit. Rest will be taken care in MPI_Wait implementation.