Time to update your tech arsenal in 2020: Asgi vs Wsgi (FastAPI vs Flask)

#WSGI example 


def application(environ, start_response):


    start_response('200 OK', [('Content-Type', 'text/plain')])


    return b'Hello, Wsgi\n'

#Asgi example

async def application(scope, receive, send):


    event = await receive()


    ...


    await send({"type": "websocket.send", ...})

pip install gunicorn
pip install gevent
pip install flask

pip install fastapi
pip install uvicorn

from flask import Flask
from flask_restful import Resource, Api
from time import sleep

app = Flask(__name__)
api = Api(app)

class Root(Resource):
    def get(self):
        print('睡10秒')
        sleep(10)
        print('醒了')
        return {'message': 'hello'}

api.add_resource(Root, '/')

if __name__ == "__main__":
    app.run()

import uvicorn
from fastapi import FastAPI
from time import sleep
app = FastAPI()

@app.get('/')
async def root():
    print('睡10秒')
    sleep(10)
    print('醒了')
    return {'message': 'hello'}

if __name__ == "__main__":
    uvicorn.run(app, host="127.0.0.1", port=8000)

ab -n 5000 -c 100 http://127.0.0.1:5000/
ab -n 5000 -c 100 http://127.0.0.1:8000/

liuyue:mytornado liuyue$ ab -n 5000 -c 100 http://127.0.0.1:5000/
This is ApacheBench, Version 2.3 <$Revision: 1826891 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 127.0.0.1 (be patient)
Completed 500 requests
Completed 1000 requests
Completed 1500 requests
Completed 2000 requests
Completed 2500 requests
Completed 3000 requests
Completed 3500 requests
Completed 4000 requests
Completed 4500 requests
Completed 5000 requests
Finished 5000 requests


Server Software:        gunicorn/20.0.4
Server Hostname:        127.0.0.1
Server Port:            5000

Document Path:          /
Document Length:        28 bytes

Concurrency Level:      100
Time taken for tests:   4.681 seconds
Complete requests:      5000
Failed requests:        0
Total transferred:      1060000 bytes
HTML transferred:       140000 bytes
Requests per second:    1068.04 [#/sec] (mean)
Time per request:       93.629 [ms] (mean)
Time per request:       0.936 [ms] (mean, across all concurrent requests)
Transfer rate:          221.12 [Kbytes/sec] received

liuyue:mytornado liuyue$ ab -n 5000 -c 100 http://127.0.0.1:8000/
This is ApacheBench, Version 2.3 <$Revision: 1826891 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 127.0.0.1 (be patient)
Completed 500 requests
Completed 1000 requests
Completed 1500 requests
Completed 2000 requests
Completed 2500 requests
Completed 3000 requests
Completed 3500 requests
Completed 4000 requests
Completed 4500 requests
Completed 5000 requests
Finished 5000 requests


Server Software:        uvicorn
Server Hostname:        127.0.0.1
Server Port:            8000

Document Path:          /
Document Length:        19 bytes

Concurrency Level:      100
Time taken for tests:   2.060 seconds
Complete requests:      5000
Failed requests:        0
Total transferred:      720000 bytes
HTML transferred:       95000 bytes
Requests per second:    2426.78 [#/sec] (mean)
Time per request:       41.207 [ms] (mean)
Time per request:       0.412 [ms] (mean, across all concurrent requests)
Transfer rate:          341.27 [Kbytes/sec] received