[TYPO3-Performance] ab failed requests

Dan Osipov dosipov at phillyburbs.com
Tue Dec 23 03:13:52 CET 2008


Hello all,

I've been testing TYPO3 installation under relatively high load, and see 
some problems with ab. There are a lot of failed requests. I have Apache 
running with mod_fcgid under Debian. The server is fairly fast - 16Gb 
RAM, Quad core Xeon processor, etc.

Anyone run into a similar issue? I'm pretty sure its my Apache set up, 
but I can't pinpoint what exactly is wrong. Its operating well for a few 
requests, but as soon as there are several concurrent users, it usually 
fails...

Here is a typical ab output:

Server Software:        Apache/2.2.3
Server Hostname:        localhost
Server Port:            80

Document Path:          /
Document Length:        99906 bytes

Concurrency Level:      100
Time taken for tests:   149.713674 seconds
Complete requests:      5000
Failed requests:        4951
    (Connect: 0, Length: 4951, Exceptions: 0)
Write errors:           0
Non-2xx responses:      77
Total transferred:      493336288 bytes
HTML transferred:       491814214 bytes
Requests per second:    33.40 [#/sec] (mean)
Time per request:       2994.273 [ms] (mean)
Time per request:       29.943 [ms] (mean, across all concurrent requests)
Transfer rate:          3217.96 [Kbytes/sec] received

Connection Times (ms)
               min  mean[+/-sd] median   max
Connect:        0    0   0.3      0       4
Processing:    24 2984 3531.0   2410   79895
Waiting:       24 2961 3502.4   2383   79895
Total:         24 2984 3531.0   2410   79895

Percentage of the requests served within a certain time (ms)
   50%   2410
   66%   2829
   75%   3093
   80%   3270
   90%   4241
   95%   7490
   98%  14059
   99%  19034
  100%  79895 (longest request)

-- 
Dan Osipov
Calkins Media
http://danosipov.com/blog/


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