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. >
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