Tools for Performance Evaluation in Linux

Intro to evaluation here...

Tools for performance evaluation

Apache Benchmark Tool

The Apache Benchmark ab [1] provides a convenient way to stress test your web server. The tool is included with the default installation of Apache.

An example of using ab to send 1000 requests, 10 at a time to the URL http://example.com/ is shown below:

$ ab -c 10 –n 1000 http://example.com/

The output of the tool will look similar to this:

Document Path:          /
Document Length:        25951 bytes

Concurrency Level:      10
Time taken for tests:   11.072 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Total transferred:      26253056 bytes
HTML transferred:       25995542 bytes
Requests per second:    90.32 [#/sec] (mean)
Time per request:       110.722 [ms] (mean)
Time per request:       11.072 [ms] (mean, across all concurrent requests)
Transfer rate:          2315.51 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:       32   33   0.4     33      39
Processing:    67   77  22.5     68     141
Waiting:       34   35   0.9     35      44
Total:        100  110  22.4    101     174