Sometimes nrniv tasks don't get terminated after CTRL+C

[lungd]

If I interrupt the optimizer at a certain point, multiple nrniv tasks remain running. A sigint handler at the right place should do the trick.

[pgleeson]

That's the expected behaviour, that the set of Neuron sims that have been set running will continue to completion and then exit. Or were you suggestion that they quit at the same time as the python script that set them running?

[lungd]

Sorry for the delay. I meant that the nrniv subprocesses can become zombies. At least with ubuntu and python27.