Tornado v.s. asyncio (Python 3.5+)

asyncio.py

#! /usr/bin/env python3

import asyncio
import contextlib


async def ping(ip):
    p = await asyncio.create_subprocess_exec('ping', '-c', '4', ip, stdout=asyncio.subprocess.PIPE)
    async for line in p.stdout:
        print(line)
    await p.wait()


async def main():
    await asyncio.wait([
        ping('8.8.8.8'),
        ping('8.8.4.4'),
    ])


if __name__ == '__main__':
    with contextlib.closing(asyncio.get_event_loop()) as main_loop:
        main_loop.run_until_complete(main())

tornado.py

#! /usr/bin/env python3

from tornado import gen, ioloop, process


async def ping(ip):
    p = process.Subprocess(['ping', '-c', '4', ip], stdout=process.Subprocess.STREAM)
    await p.stdout.read_until_close(streaming_callback=print)
    await p.wait_for_exit()


async def main():
    await gen.multi([
        ping('8.8.8.8'),
        ping('8.8.4.4'),
    ])


if __name__ == '__main__':
    main_loop = ioloop.IOLoop.instance()
    main_loop.run_sync(main)