Python ZMQ和多处理导致ZMQ.error.ZMQError:系统调用中断
我有一个Python脚本,其中绑定了几个(例如5个)ZMQ接收器套接字,如下所示:Python ZMQ和多处理导致ZMQ.error.ZMQError:系统调用中断,python,multiprocessing,zeromq,pyzmq,Python,Multiprocessing,Zeromq,Pyzmq,我有一个Python脚本,其中绑定了几个(例如5个)ZMQ接收器套接字,如下所示: receiver_1 = context.socket(zmq.PULL) receiver_1.bind("tcp://*:5555") ... receiver_5 = context.socket(zmq.PULL) receiver_5.bind("tcp://*:5559") receivers = [receiver_1, ..., receiver_5] 然后我启动一些Google计算引擎实例,
receiver_1 = context.socket(zmq.PULL)
receiver_1.bind("tcp://*:5555")
...
receiver_5 = context.socket(zmq.PULL)
receiver_5.bind("tcp://*:5559")
receivers = [receiver_1, ..., receiver_5]
然后我启动一些Google计算引擎实例,它们连接相应的发送方套接字
我希望并行地从这些套接字中提取数据,因此我尝试使用多处理池来实现这一点。代码如下所示:
def recv_result(i):
result_str = receivers[i].recv()
return cPickle.loads(result_str)
pool = multiprocessing.Pool()
while True:
results = pool.map(recv_result, [i for i in range(len(receivers))])
# break when all results have been received
...
Traceback (most recent call last):
...
File ...
results = pool.map(recv_result, [i for i in range(len(receivers))])
File "/usr/lib/python2.7/multiprocessing/pool.py", line 227, in map
return self.map_async(func, iterable, chunksize).get()
File "/usr/lib/python2.7/multiprocessing/pool.py", line 528, in get
raise self._value
zmq.error.ZMQError: Interrupted system call
运行脚本时出现的错误如下所示:
def recv_result(i):
result_str = receivers[i].recv()
return cPickle.loads(result_str)
pool = multiprocessing.Pool()
while True:
results = pool.map(recv_result, [i for i in range(len(receivers))])
# break when all results have been received
...
Traceback (most recent call last):
...
File ...
results = pool.map(recv_result, [i for i in range(len(receivers))])
File "/usr/lib/python2.7/multiprocessing/pool.py", line 227, in map
return self.map_async(func, iterable, chunksize).get()
File "/usr/lib/python2.7/multiprocessing/pool.py", line 528, in get
raise self._value
zmq.error.ZMQError: Interrupted system call
我也尝试过使用multiprocessing.Process实现相同的功能,但是我得到了基本相同的错误,尽管是以一种更混乱的方式
我试图做的是更有效地接收来自GCE实例的所有结果,因为我发现这是我脚本中的瓶颈(在我当前的工作实现中,我只有一个接收器套接字,它串行地接收来自所有GCE实例的结果)。如果有人能指出我当前代码中的错误,或者为实现我的目标提供更好的方法,我将不胜感激 几点提示:
- 很好,您可以使用ZeroMQ-它可以在不编写太多代码的情况下为您做很多事情
- 不要过度优化。通过ZeroMQ通信的多处理/线程化,您不会获得任何好处,它已经非常快,能够交换数量惊人的消息
- 如果使用线程/多处理,永远不要共享zmq上下文,它必须是线程的私有上下文,否则它会中断。这可能是您出现异常的原因
- 如果当前代码使用阻塞zeromq发送和接收,请将其更改为非阻塞。检查如何使用轮询