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| Apache Benchmark Tool: ab |
The Apache httpd web server comes with a benchmarking tool to simulate a high load and to gather data for analysis.
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ab -n 1000 -c 10 -g test_data_1.txt http://www.your-domain.com/index.html
| Option | Description |
|---|
| -n | number of requests. Default is 1 which is useless. |
| -c | concurrent requests. Default 1 |
| -g | GNU plot output. Labels are on first line of output. |
| -q | Suppress progress stattus output to stderr. |
| -t | Time limit. Maximum number of seconds. |
| -A username:password | Specify authentication credentials. |
| -X proxy[:port] | Specify a proxy server. |
See the ab man page for a list and description of all options.
This will generate the output data file test_data_1.txt.
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starttime seconds ctime dtime ttime wait
Sun Sep 20 00:15:54 2009 1253430954893362 16 808 824 47
Sun Sep 20 00:15:54 2009 1253430954893262 14 957 971 60
Sun Sep 20 00:15:54 2009 1253430954893147 9 1002 1011 62
...
...
..
..
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Console output:
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Finished 1000 requests
Server Software: Apache/2.2.3
Server Hostname: www.your-domain.com
Server Port: 80
Document Path: /index.html
Document Length: 83241 bytes
Concurrency Level: 10
Time taken for tests: 14.793312 seconds
Complete requests: 1000
Failed requests: 0
Write errors: 0
Total transferred: 83608000 bytes
HTML transferred: 83241000 bytes
Requests per second: 67.60 [#/sec] (mean)
Time per request: 147.933 [ms] (mean)
Time per request: 14.793 [ms] (mean, across all concurrent requests)
Transfer rate: 5519.25 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 20 250.2 0 3000
Processing: 53 126 52.7 120 317
Waiting: 19 51 29.5 46 246
Total: 53 147 260.2 120 3305
Percentage of the requests served within a certain time (ms)
50% 120
66% 142
75% 159
80% 172
90% 198
95% 227
98% 282
99% 314
100% 3305 (longest request)
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This shows the load limit of the server.
| Using GNU plot to view loading data: |
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$ gnuplot
gnuplot> set terminal png
gnuplot> set output "ApacheBenchmarkResults.png"
gnuplot> set title "Benchmark from Server X"
gnuplot> set size 1,0.5
gnuplot> set key left top
gnuplot> set xlabel 'request'
gnuplot> set ylabel 'ms'
gnuplot> plot "test_data_1.txt" using 10 with lines title 'Benchmark from Server X'
gnuplot> exit
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| Benchmarking Tool: httperf |
Web performance benchmarking tool httperf. Httperf sends requests to the web server at a specified rate and gathers stats. Increase till one finds the saturation point.
Installation:
- Debian: apt-get install httperf
Example usage:
- Print performance stats for home page of your-domain.com: httperf --hog --server www.your-domain.com
- Create 100 connections at a rate of 10/sec: httperf --hog --server http://www.your-domain.com/ --num-conn 100 --rate 10 --timeout 5
- Generate 10 sessions at a rate of one session/sec every 2 seconds: httperf --hog --ser=www --wsess=10,5,2 --rate 1 --timeout 5
httperf command line options:
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| Command | Command Description |
|---|
| --hog | Use as many TCP ports as necessary to generate stats (else limited to port 1024-5000) |
| --num-calls | Session oriented workloads. |
| --max-connections=# | Limit the number of connections to that specified. |
| --num-calls=# | Specify the number of calls to issue on each connection before closing it. |
| --server host-name | Default localhost. Specify IP address of host name. |
| --wsess=N1,N2,X | Specify session where
N1: number of sessions
N2: number of calls per session
X: delay between calls (sec) |
| --timeout | Stop if there is no response within timeout period. |
Links:
 Books: |
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