網站壓力測試工具 - Apache Benchmark(ab) 說明

ab指令的語法是 ab -c {同時進行的request數量} -n {次數} {url}


例如:
同時連線數: 100 人
ab -n  100 -c  100 http://xx.xx.xx.xx/index.php



C:\Apache\bin>ab -n 100 -c 100 http://192.168.1.103/index.php


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 192.168.1.103 (be patient).....done


Server Software:        Apache
Server Hostname:        192.168.1.103
Server Port:            80

Document Path:          /index.php
Document Length:        2261 bytes

Concurrency Level:      100
Time taken for tests:   5.432 seconds
Complete requests:      100
Failed requests:        0
Write errors:           0
Total transferred:      257300 bytes
HTML transferred:       226100 bytes
Requests per second:    18.41 [#/sec] (mean)
Time per request:       5432.000 [ms] (mean)
Time per request:       54.320 [ms] (mean, across all concurrent requests)
Transfer rate:          46.26 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        2    7  43.5      2     438
Processing:   292 2631 1352.8   2680    4916
Waiting:      289 2629 1352.9   2678    4915
Total:        295 2638 1348.1   2686    4918

Percentage of the requests served within a certain time (ms)
  50%   2686
  66%   3401
  75%   3733
  80%   3875
  90%   4534
  95%   4666
  98%   4720
  99%   4918
 100%   4918 (longest request)



後面的幾行粗體字資料是整個回應等候時間的統計，算是 Apache Benchmark 的數據價值精華所在。這些數據表示了這 100 個人所感受到的回應速度統計。以上面這個例子來說，此次執行結果顯示這次測試結果從 2.282 秒到 4.918 秒不等。 其中50%(50)的使用者感受的反應時間是 2.686 秒以下, 90%(90)的使用者感受的反應時間是 4.534 秒中以下，所有的人均在 4.918 秒內得到回應。