这篇文章主要介绍了python3通过gevent.pool限制协程并发数量的实现方法，本文通过实例代码给大家介绍的非常详细，对大家的学习或工作具有一定的参考借鉴价值,需要的朋友可以参考下
协程虽然是轻量级的线程，但到达一定数量后，仍然会造成服务器崩溃出错。最好的方法通过限制协程并发数量来解决此类问题。
server代码：
#!/usr/bin/env python # -*- coding: utf-8 -*- # @Author : Cain # @Email : [email protected] # @Filename : gevnt_sockserver.py # @Last modified : 2017-11-24 16:31 # @Description : import sys import socket import time import gevent from gevent import socket,monkey,pool #导入pool monkey.patch_all() def server(port, pool): s = socket.socket() s.bind(('0.0.0.0', port)) s.listen() while True: cli, addr = s.accept() #print("Welcome %s to SocketServer" % str(addr[0])) pool.spawn(handle_request, cli) #通过pool.spawn()运行协程 def handle_request(conn): try: data = conn.recv(1024) print("recv:", data) data = 'From SockeServer:192.168.88.118---%s' % data.decode("utf8") conn.sendall(bytes(data, encoding="utf8")) if not data: conn.shutdown(socket.SHUT_WR) except Exception as ex: print(ex) finally: conn.close() if __name__ == '__main__': pool = pool.Pool(5) #限制并发协程数量5 server(8888, pool)
client(通过gevent模拟并发数量)：
import socket import gevent from gevent import socket, monkey from gevent.pool import Pool import time monkey.patch_all() HOST = '192.168.88.118' PORT = 8888 def sockclient(i): #time.sleep(2) s = socket.socket() s.connect((HOST, PORT)) #print(gevent.getcurrent()) msg = bytes(("This is gevent: %s" % i),encoding="utf8") s.sendall(msg) data = s.recv(1024) print("Received", data.decode()) s.close() pool = Pool(5) threads = [pool.spawn(sockclient, i) for i in range(2000)] gevent.joinall(threads)
由于服务器限制连接并发数量；所以客户端同时并发连接数超过服务器端并发数量，就会引发连接错误信息：
Exception in thread Thread-849:
Traceback (most recent call last):
File “C:\Users\admin\AppData\Local\Programs\Python\Python36\lib\threading.py”, line 916, in _bootstrap_inner
self.run()
File “C:\Users\admin\AppData\Local\Programs\Python\Python36\lib\threading.py”, line 864, in run
self._target(*self._args, **self._kwargs)
File “E:/chengd/python/python3/matp/die/geven_sockclient.py”, line 26, in sockclient来源gao!daima.com搞$代!码网
data = s.recv(1024)
ConnectionResetError: [WinError 10054] 远程主机强迫关闭了一个现有的连接。
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