If I connect to mongodb quickly in very short time. Mongodb server will soon be un-responsable and pymongo driver will raise an exception

even I tried sleep 1 sec, After about 200 connections mongo server begin to refuse connections

I have a production server splited in several processes when they connect to mongodb at the same time the problem will show up

reproduce the problem use the code below
macbook pro

from pymongo.errors import OperationFailure, AutoReconnect
from pymongo import Connection
import time

l = []
for i in xrange(5000):
conn = Connection('localhost',45678)
#time.sleep(1)#remove comment will make to 200 conns
l.append(conn)
time.sleep(300)