如何利用IO复用技术提升服务器并发性能？

import socket
import select

# 创建socket对象
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server_socket.bind(('0.0.0.0', 8080))
server_socket.listen(5)

# 创建epoll对象
epoll = select.epoll()
epoll.register(server_socket.fileno(), select.EPOLLIN)

try:
    connections = {}
    while True:
        events = epoll.poll(1)
        for fileno, event in events:
            if fileno == server_socket.fileno():
                client_socket, addr = server_socket.accept()
                epoll.register(client_socket.fileno(), select.EPOLLIN)
                connections[client_socket.fileno()] = client_socket
            elif event & select.EPOLLIN:
                client_socket = connections[fileno]
                data = client_socket.recv(1024)
                if data:
                    print(f'Received: {data.decode()}')
                    client_socket.send(b'Received your message')
                else:
                    epoll.unregister(fileno)
                    client_socket.close()
                    del connections[fileno]
finally:
    epoll.unregister(server_socket.fileno())
    epoll.close()
    server_socket.close()