script hangs with mpirun

[apdavison]

Eloy Retamino commented:

An issue was detected with latest https://github.com/NeuralEnsemble/PyNN/tree/nest-dev + NEST 2.18:

running the script braitenberg_distributed.py works fine:

python braitenberg_distributed.py

running it with mpirun hangs (concretely after line 99 while creating ):

mpirun -np 4 python braitenberg_distributed.py

(also see https://gitlab.humanbrainproject.org/joint_infrastructure_coordination/Coordination/issues/92#note_13801)

[apdavison]

I can reproduce this problem with both NEST 2.16 / PyNN 0.9.4 and NEST 2.18 / PyNN nest-dev branch.

It appears that the problem only arises in unusual circumstances (small network sizes, where there are only a few neurons per MPI process.