title: investigating apache benchmark failed request
body: <p>I am just start using AB just today. Read couple of AB tutorial on new and thought give it a try for load testing my site.</p>
  
  <p>After using it couple of time I got huge number of failed request. Can you explain what is mean by a failed request? How can I investigate more for this issue?</p>
  
  <p>Sample AB result:</p>
  
  <pre><code>-jailshell-3.2$ ab -n500 -c10 http://www.tweeting.tv/index.php
  This is ApacheBench, Version 2.0.40-dev &lt;$Revision: 1.146 $&gt; apache-2.0
  Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
  Copyright 2006 The Apache Software Foundation, http://www.apache.org/
  
  Benchmarking www.tweeting.tv (be patient)
  Completed 100 requests
  Completed 200 requests
  Completed 300 requests
  Completed 400 requests
  Finished 500 requests
  
  
  Server Software:        Apache
  Server Hostname:        www.tweeting.tv
  Server Port:            80
  
  Document Path:          /index.php
  Document Length:        242861 bytes
  
  Concurrency Level:      10
  Time taken for tests:   97.846330 seconds
  Complete requests:      500
  Failed requests:        481
     (Connect: 0, Length: 481, Exceptions: 0)
  Write errors:           0
  Non-2xx responses:      2
  Total transferred:      121214449 bytes
  HTML transferred:       121003283 bytes
  Requests per second:    5.11 [#/sec] (mean)
  Time per request:       1956.927 [ms] (mean)
  Time per request:       195.693 [ms] (mean, across all concurrent requests)
  Transfer rate:          1209.78 [Kbytes/sec] received
  
  Connection Times (ms)
                min  mean[+/-sd] median   max
  Connect:        0 1503 1675.5      1    9036
  Processing:   130  393 285.1    319    2382
  Waiting:       92  244 226.3    192    2180
  Total:        153 1896 1726.2   1121   10374
  
  Percentage of the requests served within a certain time (ms)
    50%   1121
    66%   3308
    75%   3355
    80%   3375
    90%   3451
    95%   3603
    98%   4163
    99%   9315
   100%  10374 (longest request)
  </code></pre>
  
  <p>N.B. I am using Hostgator Linux shared server.</p>