无堆叠的python网络性能会随着时间的推移而下降?

所以我在玩弄无堆叠的巨蟒,写一个 非常简单 webserver教自己使用微线程/微线程编程。但现在我的问题是,当我运行类似 ab -n 100000 -c 50 http://192.168.0.192/ (100k请求,50并发)在Apache工作台上,我得到了类似于6K req/s的请求,第二次运行它时,我得到了5.5K、第三次5K、第四次4.5K等,一直到100req/s或其他东西。

不过,当我重新启动python脚本时,问题就消失了。

现在我的问题是为什么?我忘记删除微线程了吗?我检查了stackless.getruncount()(它总是返回1,出于某种原因),所以看起来不会有死掉的微线程挂在身边?我尝试对所有完成的微线程调用.kill(),但没有帮助。我就是想不出这个。

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()