celery 使用multiprocessing 问题记录

报错：

[2013-11-29 14:27:48,297: ERROR/MainProcess] Task app.add[e5d184c0-471f-4fc4-804c-f760178d4847] raised exception: AssertionError('daemonic processes are not allowed to have children',)
Traceback (most recent call last):
  File "/Users/aromanovich/Envs/celery3.1/lib/python2.7/site-packages/celery/app/trace.py", line 218, in trace_task
    R = retval = fun(*args, **kwargs)
  File "/Users/aromanovich/Envs/celery3.1/lib/python2.7/site-packages/celery/app/trace.py", line 398, in __protected_call__
    return self.run(*args, **kwargs)
  File "/Users/aromanovich/Projects/celery/app.py", line 10, in add
    manager = multiprocessing.Manager()
  File "/usr/local/Cellar/python/2.7.6/Frameworks/Python.framework/Versions/2.7/lib/python2.7/multiprocessing/__init__.py", line 99, in Manager
    m.start()
  File "/usr/local/Cellar/python/2.7.6/Frameworks/Python.framework/Versions/2.7/lib/python2.7/multiprocessing/managers.py", line 524, in start
    self._process.start()
  File "/usr/local/Cellar/python/2.7.6/Frameworks/Python.framework/Versions/2.7/lib/python2.7/multiprocessing/process.py", line 124, in start
    'daemonic processes are not allowed to have children'

　　解决方法：

　　设置环境变量 export PYTHONOPTIMIZE=1