我正在使用Stackless Python玩耍,编写一个非常简单的Web服务器来教自己使用微线程/任务。但我遇到了问题,当我运行类似于
然而,当我重新启动Python脚本时,这个问题就消失了。
现在我的问题是为什么?我是否忘记删除tasklets?我已经检查了stackless.getruncount()(出于某种原因,它似乎总是返回1),所以似乎没有任何死掉的tasklets悬挂?我尝试调用.done()函数来结束所有已完成的tasklets,但这并没有帮助。我只是无法解决这个问题。
ab -n 100000 -c 50 http://192.168.0.192/
(100,000个请求,50并发)时,在Apache bench中会得到大约6k req/s的结果,第二次运行时我得到5.5k,第三次5k,第四次4.5k等等,一直下降到大约100req/s。然而,当我重新启动Python脚本时,这个问题就消失了。
现在我的问题是为什么?我是否忘记删除tasklets?我已经检查了stackless.getruncount()(出于某种原因,它似乎总是返回1),所以似乎没有任何死掉的tasklets悬挂?我尝试调用.done()函数来结束所有已完成的tasklets,但这并没有帮助。我只是无法解决这个问题。
import socket
import select
import stackless
import time
class socket_wrapper(object):
def __init__(self, sock, sockets):
super(socket_wrapper, self).__init__()
self.sock = sock
self.fileno = sock.fileno
self.sockets_list = sockets
self.channel = stackless.channel()
self.writable = False
self.error = False
def remove(self):
self.sock.close()
self.sockets_list.remove(self)
def send(self, data):
self.sock.send(data)
def push(self, bytes):
self.channel.send(self.sock.recv(bytes))
def stackless_accept(accept, handler, recv_size=1024, timeout=0):
sockets = [accept]
while True:
read, write, error = select.select(sockets, sockets, sockets, timeout)
for sock in read:
if sock is accept:
# Accept socket and create wrapper
sock = socket_wrapper(sock.accept()[0], sockets)
# Create tasklett for this connection
tasklet = stackless.tasklet(handler)
tasklet.setup(sock)
# Store socket
sockets.append(sock)
else:
# Send data to handler
sock.push(recv_size)
# Tag all writable sockets
for sock in write:
if sock is not accept:
sock.writable = True
# Tag all faulty sockets
for sock in error:
if sock is not accept:
sock.error = True
else:
pass # should do something here if the main socket is faulty
timeout = 0 if socket else 1
stackless.schedule()
def simple_handler(tsock):
data = ""
while data[-4:] != "\r\n\r\n":
data += tsock.channel.receive()
while not tsock.writable and not tsock.error:
stackless.schedule()
if not tsock.error:
tsock.send("HTTP/1.1 200 OK\r\nContent-length: 8\r\n\r\nHi there")
tsock.remove()
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind(("192.168.0.192", 8000))
sock.listen(5)
stackless.tasklet(stackless_accept)(sock, simple_handler)
stackless.run()