ab 测试工具

-bash-4.1# ab -c 100 -n 1000 http://tripb2b.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 tripb2b.com (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Completed 400 requests
Completed 500 requests
Completed 600 requests
Completed 700 requests
Completed 800 requests
Completed 900 requests
Completed 1000 requests
Finished 1000 requests

Server Software:        nginx
Server Hostname:        tripb2b.com
Server Port:            80

Document Path:          /
Document Length:        154 bytes

Concurrency Level:      100
Time taken for tests:   0.277 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Non-2xx responses:      1032
Total transferred:      361200 bytes
HTML transferred:       158928 bytes
Requests per second:    3605.53 [#/sec] (mean)
Time per request:       27.735 [ms] (mean)
Time per request:       0.277 [ms] (mean, across all concurrent requests)
Transfer rate:          1271.79 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        3   12   3.2     13      23
Processing:     4   13   2.7     13      23
Waiting:        3   13   2.7     13      23
Total:          7   26   4.0     26      43

Percentage of the requests served within a certain time (ms)
  50%     26
  66%     27
  75%     27
  80%     28
  90%     30
  95%     32
  98%     33
  99%     35
 100%     43 (longest request)