Hi all. I've an MPI application in which at one moment one rank receives a slice of an array from the other nodes. Thing is that my application hangs there.
One thing I could get from printint out logs are: (Rank 0) Starts MPI_Recv from source 4 But then it receives: MPI_Send from 0 MPI_Send from 1 ... From 10 ... From 7 ... From 6 Then at one neither of them are responding. The message is a double array type of size 100.000. Later it would receive the message from 4. So i assume the buffer on the Recv side is overflowing. Few tests: - Using smaller array size works - alreay tried using isend. Irecv. Bsend. And the ranks still get stuck. So that leaves me to a few questions rather than how to solve this issue: - how can i know the size of mpi's interbal buffer? - how would one debug this? Regards, Carlos.
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