在Tornado/Python3中启动多进程TCPServer和HTTPServer？

import tornado.httpserver
import tornado.ioloop
import tornado.web
import multiprocessing

class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("Hello, World!")

def make_app():
    return tornado.web.Application([
        (r"/", MainHandler),
    ])

def start_http_server():
    app = make_app()
    http_server = tornado.httpserver.HTTPServer(app)
    http_server.bind(8888)
    http_server.start(multiprocessing.cpu_count())
    tornado.ioloop.IOLoop.current().start()

if __name__ == "__main__":
    start_http_server()

import tornado.tcpserver
import tornado.ioloop
import multiprocessing

class EchoServer(tornado.tcpserver.TCPServer):
    async def handle_stream(self, stream, address):
        while True:
            data = await stream.read_until(b"\n")
            if not data:
                break
            stream.write(data)

def start_tcp_server():
    server = EchoServer()
    server.bind(8888)
    server.start(multiprocessing.cpu_count())
    tornado.ioloop.IOLoop.current().start()

if __name__ == "__main__":
    start_tcp_server()