Daemonic subprocesses?

[MichaelClerx]

@YannStanislasBarral ran into some trouble when he tried nested multiprocessing (specifically, he had a situation where each function evaluation required four independent simulations, which we wanted to parallelise). This failed with a fairly cryptic message about daemonic subproccesses

Seems though, that we could make the parallel evaluator's processes "non-daemonic" to work around this problem, but I've forgotton what that means or what the implications would be

https://stackoverflow.com/questions/28491558/launching-nested-processes-in-multiprocessing