【python】多进程与mongo

参考：http://api.mongodb.com/python/current/faq.html#using-pymongo-with-multiprocessing

如果使用了多进程，则必须在子进程中创建mongo连接。不能创建一个mongo连接传给多个进程！！

# Each process creates its own instance of MongoClient.
def func():
    db = pymongo.MongoClient().mydb
    # Do something with db.

proc = multiprocessing.Process(target=func)
proc.start()