Comment by akvadrako

I completely disagree - Python threads are basically "green threads", so they have their place but aren't related to parallelisation. But true multiprocessing is ugly when you have hundreds of cores, which is where CPUs are going. There is no standard UI convention on most OSes to group those processes per app, in terms of signals or stats or whatever.

So besides the unproven possibility of removing the GIL, subinterpreters are the best way forward, better than threads or the multiprocessing package.