tornado_google.py

from tornado.httpclient import AsyncHTTPClient
import tornado.gen
import tornado.ioloop
import timeit

@tornado.gen.coroutine
def make_request(index):
    client = AsyncHTTPClient()
    print(index, 'started')
    response = yield client.fetch('http://google.com', raise_error=False)
    print(index, response.code)

@tornado.gen.coroutine
def main():
    yield [make_request(i) for i in range(5)]

print(timeit.timeit(lambda: tornado.ioloop.IOLoop.current().run_sync(main), number=1))