gunicorn + gevent

ab.txt

root@jenkins:~# ab -k -n 10000 -c 300 http://kennethreitz.com/
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking kennethreitz.com (be patient)
Completed 1000 requests
Completed 2000 requests
Completed 3000 requests
Completed 4000 requests
Completed 5000 requests
Completed 6000 requests
Completed 7000 requests
Completed 8000 requests
Completed 9000 requests
Completed 10000 requests
Finished 10000 requests


Server Software:        gunicorn/0.13.4
Server Hostname:        kennethreitz.com
Server Port:            80

Document Path:          /
Document Length:        9984 bytes

Concurrency Level:      300
Time taken for tests:   5.945 seconds
Complete requests:      10000
Failed requests:        2
   (Connect: 0, Receive: 0, Length: 2, Exceptions: 0)
Write errors:           0
Non-2xx responses:      2
Keep-Alive requests:    7733
Total transferred:      101939947 bytes
HTML transferred:       99821246 bytes
Requests per second:    1682.08 [#/sec] (mean)
Time per request:       178.351 [ms] (mean)
Time per request:       0.595 [ms] (mean, across all concurrent requests)
Transfer rate:          16745.22 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    9  45.5      0    3051
Processing:    44  165 128.5    140    5368
Waiting:       41  147 113.9    127    5228
Total:         44  174 137.6    147    5368

Percentage of the requests served within a certain time (ms)
  50%    147
  66%    180
  75%    202
  80%    217
  90%    272
  95%    321
  98%    414
  99%    600
 100%   5368 (longest request)