[英]python asyncore using 100% CPU after client connects
我正在使用asyncore来实现发布订阅。 我理解使用twisted或ZMQ可能是一个更好的解决方案,但在这种情况下它需要是纯python。 等待连接时,CPU使用率约为1%,一旦客户端连接CPU使用率跳转写入高达100%。 即使客户端断开连接,它也不会降回。
我的服务器类:
class Host(asyncore.dispatcher):
log = logging.getLogger('Host')
def __init__(self, port=7655):
asyncore.dispatcher.__init__(self)
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
self.set_reuse_addr()
self.bind(('0.0.0.0', port,))
self.listen(5)
self.clients = []
def handle_accept(self):
socket, addr = self.accept()
self.log.info("Aceepted client at {0}:{1}".format(addr[0], addr[1]))
self.clients.append(RemoteClient(self, socket, addr))
def broadcast(self, message):
self.log.info("Broadcasting message: {0}".format(message))
for client in self.clients:
client.message(message)
我的经纪人:
class RemoteClient(asyncore.dispatcher):
log = logging.getLogger('Host')
def __init__(self, host, socket, address):
asyncore.dispatcher.__init__(self, socket)
self.host = host
self.outbox = collections.deque()
def message(self, message):
self.outbox.append(message)
def handle_write(self):
if not self.outbox:
return
message = self.outbox.popleft()
if len(message) > MAX_MESSAGE_LENGTH:
raise ValueError('Message too long')
self.send(message)
def handle_close(self):
self.host.clients.remove(self)
self.log.info("Client removed from list")
self.close()
def handle_error(self):
self.log.error("Socket error")
我曾尝试寻求解决方案,但似乎无法解决发生的事情。 任何帮助赞赏!
您的问题是您没有覆盖方法asyncore.dispatcher.writeable
,默认实现:
def writable(self):
return True
这导致asyncore.poll
在while True
循环中运行(因此使用100%CPU):
def poll(timeout=0.0, map=None):
if map is None:
map = socket_map
if map:
r = []; w = []; e = []
for fd, obj in map.items():
is_r = obj.readable()
is_w = obj.writable() # This is always true
if is_r:
r.append(fd)
if is_w:
w.append(fd)
if is_r or is_w:
e.append(fd) # This always happens
if [] == r == w == e:
time.sleep(timeout) # This never happens
return
try:
# Here, having w (as function parameter) set to non-empty value
# causes select to immediately return without waiting with w set
# just to your client
r, w, e = select.select(r, w, e, timeout)
我认为真正干净的解决方案是重新实现asyncore与某种threading.Event
机制,强制等待可写对象,但到目前为止,这对我有用:
# Add to RemoteClient
def writable(self):
''' It has point to call handle_write only when there's something in outbox
Having this method always returning true will cause 100% CPU usage
'''
return bool(self.outbox)
# When you start loop
asyncore.loop(timeout=5.0)
您还可以在官方文档中的示例中看到writable()
被覆盖。
我只是希望能够比30秒后更快地等待。
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