import gc
import thread
import time

class Ouch:
    def __del__(self):
        pass

def g():
    while 1:
        n = gc.collect()
        print "collected", n
        time.sleep(0.1)

def f():
    while 1:
        t = ()
        for i in range(300):
            t = [t, Ouch()]

thread.start_new_thread(g, ())
f()