压力测试

执行下面的命令，可以对服务器进行基准测试。

ab -c 100 -n 1000 http://localhost/

以上例程的输出类似于：

This is ApacheBench, Version 2.3 <$Revision: 1843412 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking localhost (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:        localhost
Server Port:            80

Document Path:          /
Document Length:        1358 bytes

Concurrency Level:      100
Time taken for tests:   2.845 seconds
Complete requests:      1000
Failed requests:        0
Total transferred:      1695000 bytes
HTML transferred:       1358000 bytes
Requests per second:    351.55 [#/sec] (mean)
Time per request:       284.458 [ms] (mean)
Time per request:       2.845 [ms] (mean, across all concurrent requests)
Transfer rate:          581.90 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.3      0       1
Processing:    38   78   7.0     79      93
Waiting:        4   78   7.3     79      93
Total:         38   78   6.9     79      93

Percentage of the requests served within a certain time (ms)
  50%     79
  66%     80
  75%     80
  80%     80
  90%     81
  95%     82
  98%     86
  99%     91
 100%     93 (longest request)