bench.py

import fibers
import threading


def test(*args):
    return 42


def run_test():
    for i in xrange(1000000):
        f = fibers.Fiber(target=test)
        r = f.switch()
        assert r==42


threads = [threading.Thread(target=run_test) for x in xrange(10)]
[t.start() for t in threads]
[t.join() for t in threads]

gbench.py

import greenlet
import threading


def test(*args):
    return 42


def run_test():
    for i in xrange(1000000):
        f = greenlet.greenlet(test)
        r = f.switch()
        assert r==42


threads = [threading.Thread(target=run_test) for x in xrange(10)]
[t.start() for t in threads]
[t.join() for t in threads]