output

$ python test_mcache.py 
no monkeypatch
Start mem: 7491584 End mem: 41394176 Difference 33902592
$ python test_mcache.py monkeypatch
monkeypatch
Start mem: 7491584 End mem: 7491584 Difference 0

test_mcache.py

import os
import sys
import memcache
import psutil
def spawn_clients(num):
    for i in xrange(num):
        m = memcache.Client(['localhost:11211'])

def run():
    p = psutil.Process(os.getpid())
    start = p.get_memory_info()
    print 'Start mem:', start.rss,
    spawn_clients(10000)
    end = p.get_memory_info()
    print 'End mem:', end.rss, 'Difference', end.rss - start.rss

if sys.argv[-1] == 'monkeypatch':
    print 'monkeypatch'
    memcache.Client.debuglog = None
else:
    print 'no monkeypatch'
run()