Dear Davin, 

Thanks for the input, I was perfectly aware that the "solution" I proposed is not realistic. But the feedback that multiprocessing is using threads internally is useful as I can quickly abandon the idea to do something like the check I proposed in our code base without spending time on it. 

I was aware of the Gil, I just did not anticipate that big a problem when mixing threads and processes with rather simple python code. My bad, sorry for the noise. 

Cheers, 

Martin