measure apache speed with ab

Submitted by admin on Sat, 11/06/2010 - 12:54
dragster
  1. introduction
  2. install
  3. configure
  4. run
  5. check your work
  6. troubleshoot

introduction

Measure the performance of the LIC (Larg's Internet Cluster). Use the Apache HTTP server benchmarking tool.

This test gets a test page a hundred times. The external test host xcl01 sends the requests and the web servers ics01, ics02 and ics03 send the replies. This simple web site test finishes in a few milliseconds.

See http://cluster.planetlarg.com/mediawiki/index.php/Benchmark_with_ab

measure speed

Use the apache ab command.

  1. Open a CLI on the server host.
  2. Measure speed. 
    issalarg@xcl01:~$ /usr/bin/ab -n 100 -c 10  http://200.0.0.10/infrastructure/host1
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 200.0.0.10 (be patient).....done


Server Software:        Apache/2.2.9
Server Hostname:        200.0.0.10
Server Port:            80

Document Path:          /infrastructure/host1
Document Length:        6 bytes

Concurrency Level:      10
Time taken for tests:   0.053 seconds
Complete requests:      100
Failed requests:        0
Write errors:           0
Total transferred:      25534 bytes
HTML transferred:       600 bytes
Requests per second:    1874.20 [#/sec] (mean)
Time per request:       5.336 [ms] (mean)
Time per request:       0.534 [ms] (mean, across all concurrent requests)
Transfer rate:          467.34 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    1   0.3      1       1
Processing:     1    4   3.0      5      18
Waiting:        1    4   2.9      4      18
Total:          1    5   3.0      5      19

Percentage of the requests served within a certain time (ms)
  50%      5
  66%      7
  75%      7
  80%      8
  90%      8
  95%      9
  98%     10
  99%     19
 100%     19 (longest request)
issalarg@xcl01:~$
  3. Close the CLI.

troubleshoot