Unfortunately, Python is still bound by the GIL, so to my understanding, gevent will never spawn any kernel threads. This effectively means there is no true par

Unfortunately, Python is still bound by the GIL, so to my understanding, gevent will never spawn any kernel threads. This effectively means there is no true parallelism possible; context switches between greenthreads pretty much only occur when waiting on I/O. I believe this is the case for all other Python concurrency libraries as well, including the threading library in Python's standard lib. Most people, including myself, use gevent for I/O bound applications (where it excels), so this usually doesn't pose any issues. For CPU bound tasks where performance is important, I'd probably use something other than Python (likely Go, personally).