OSError: [Errno 28] No space left on deviceHi PreciousParrot26
I think this says it all 🙂 there is no more storage left to run all those subprocesses

btw:

I am curious about why a

ThreadPool

of

16

threads is gathered,

This is the maximum simultaneous jobs it will try to launch (it will launch more after the launching is doe, notice not the actual execution) but this is just a way to limit it.