Under single-threaded concurrency socket

from gevent Import Monkey; monkey.patch_all ()
 from socket Import *
 from gevent Import spawn # before importing spawn must pass Monkey 
# both a io intensive tasks 
DEF Comun (conn):
     the while True: # links circulating 
        the try :
            data = conn.recv(1024)
            if len(data) == 0: break
            conn.send(data.upper())
        except ConnectionResetError:
            break
    conn.close()

def server(ip,port,backlog=5):
    server = socket (AF_INET, SOCK_STREAM)
    server.bind((ip,port))
    server.listen(backlog)

    the while True:   # link cycle 
        conn, client_addr = server.accept ()
         Print (client_addr)

        # Communication 
        spawn (comun, conn)

if __name__ == '__main__':
    g1=spawn(server,'127.0.0.1',8080)
    g1.join()

Server

from threading import Thread,current_thread  #开线程
from socket import *

def client():
    client = socket (AF_INET, SOCK_STREAM)
    client.connect(('127.0.0.1',8080))
    n=0
    while True:
        msg='%s say hello %s' %(current_thread().name,n)
        n+=1
        client.send(msg.encode('utf-8'))
        data=client.recv(1024)
        print(data.decode('utf-8'))

if __name__ == '__main__':
    for i in range(500):
        t=Thread(target=client)
        t.start()

Client

Realized withstand 500 concurrent amount in a single thread