(gunicorn) ~/mess/gunicorn $ cat tornado_app.py
from tornado.web import RequestHandler, asynchronous, Application
from tornado.ioloop import IOLoop

import time
from datetime import timedelta
import os

class MainHandler(RequestHandler):
    #@asynchronous
    def get(self):
        print "GET start"
        print "pid: "+str(os.getpid())
        #def complete_req():
        #    self.write("Hello, world.<br>pid: "+str(os.getpid()))
        #    self.finish()
        #    print "GET actual finish"

        #IOLoop.instance().add_timeout(timedelta(0, 5), complete_req)
        time.sleep(3)
        self.write("Hello, world.<br>pid: "+str(os.getpid()))
        print "GET finish"

app = Application([
    (r"/", MainHandler)
])
(gunicorn) ~/mess/gunicorn $ gunicorn -k tornado tornado_app:app -w 4
2014-04-12 20:57:52 [30465] [INFO] Starting gunicorn 18.0
2014-04-12 20:57:52 [30465] [INFO] Listening at: http://127.0.0.1:8000 (30465)
2014-04-12 20:57:52 [30465] [INFO] Using worker: tornado
2014-04-12 20:57:52 [30474] [INFO] Booting worker with pid: 30474
2014-04-12 20:57:52 [30475] [INFO] Booting worker with pid: 30475
2014-04-12 20:57:52 [30476] [INFO] Booting worker with pid: 30476
2014-04-12 20:57:52 [30477] [INFO] Booting worker with pid: 30477
GET start
pid: 30474
GET finish
GET start
pid: 30474
GET finish
GET start
pid: 30474
GET finish