app.py

import gevent.monkey
gevent.monkey.patch_all()

import flask
from flask.ext.sqlalchemy import SQLAlchemy

app = flask.Flask(__name__)
app.debug = True
app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql+pymysql://root@localhost/test'
db = SQLAlchemy(app)

@app.route('/')
def index():
    db.session.execute('SELECT SLEEP(3)')
    return "Hello"

if __name__ == '__main__':
    app.run(debug=True)

console1.txt

$ gunicorn -R --debug --access-logfile - --error-logfile - -k gevent app:app
2014-05-09 07:49:58 [89902] [INFO] Starting gunicorn 18.0
2014-05-09 07:49:58 [89902] [INFO] Listening at: http://127.0.0.1:8000 (89902)
2014-05-09 07:49:58 [89902] [INFO] Using worker: gevent
2014-05-09 07:49:58 [89905] [INFO] Booting worker with pid: 89905
127.0.0.1 - - [09/May/2014:07:50:03] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:03] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:03] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:03] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:03] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:03] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:03] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:03] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:03] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:03] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:06] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:06] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:06] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:06] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:06] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:06] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:06] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:06] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:06] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:06] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:09] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:09] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:09] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:09] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:09] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:09] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:09] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:09] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:09] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:09] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:12] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:12] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:12] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:12] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:12] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:12] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:12] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:12] "GET / HTTP/1.1" 200 5 "-" "-"
127.0.0.1 - - [09/May/2014:07:50:12] "GET / HTTP/1.1" 200 5 "-" "-"
^C
2014-05-09 07:50:29 [89905] [INFO] Worker exiting (pid: 89905)
2014-05-09 07:50:29 [89902] [INFO] Handling signal: int
2014-05-09 07:50:30 [89902] [INFO] Shutting down: Master

console2.txt

$ wrk -d 10 -c 10 --latency --timeout 5 http://127.0.0.1:8000/
Running 10s test @ http://127.0.0.1:8000/
  2 threads and 10 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     3.01s   253.14us   3.01s   100.00%
    Req/Sec     1.00      0.00     1.00    100.00%
  Latency Distribution
     50%    3.01s
     75%    3.01s
     90%    3.01s
     99%    3.01s
  30 requests in 10.01s, 4.89KB read
Requests/sec:      3.00
Transfer/sec:     500.73B