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 : 771535427@qq.com
# @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
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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