简单测试gevent并发性能
用gevent的示例代码测试了一下并发性能：
from gevent import monkey; monkey.patch_all()在亚马逊（Amazon）最小的EC2——micro instance（1 CPU，600M）上测试结果如下：
from gevent import wsgi
def app(env, start_response):
start_response('200 OK', [('Content-Type', 'text/html')])
return ['<html><head><title>AB Test</title></head><body><h1>Hello</h1></body></html>']
print('Start gevent 9999...')
wsgi.WSGIServer(('', 9999), app).serve_forever()
$ ab -n 10000 -c 1000 -k http://localhost:9999/每秒并发可支持2215个请求。
...
Concurrency Level: 1000
Time taken for tests: 4.514 seconds
Complete requests: 10000
Failed requests: 0
Write errors: 0
Total transferred: 1900000 bytes
HTML transferred: 750000 bytes
Requests per second: 2215.36 [#/sec] (mean)
Time per request: 451.393 [ms] (mean)
Time per request: 0.451 [ms] (mean, across all concurrent requests)
Transfer rate: 411.05 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 105 350.3 9 3029
Processing: 71 165 81.3 145 1747
Waiting: 67 161 81.2 142 1744
Total: 88 270 383.4 152 3395
Percentage of the requests served within a certain time (ms)
50% 152
66% 165
75% 176
80% 205
90% 353
95% 1158
98% 1407
99% 1880
100% 3395 (longest request)
