Carlos, can you post a trimmed version of your code that evidences the issue ?
Keep in mind that if you want to write MPI code that is correct with respect to the standard, you should assume MPI_Send() might block until a matching receive is posted. Cheers, Gilles Sent from my iPod > On Mar 27, 2019, at 20:46, carlos aguni <aguni...@gmail.com> wrote: > > Not "MPI_Send from 0".. > MPI_Send from 1 to 0 > MPI_Send from 7 to 0 > And so on.. > >> On Wed, Mar 27, 2019, 8:43 AM carlos aguni <aguni...@gmail.com> wrote: >> 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. > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://lists.open-mpi.org/mailman/listinfo/users
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