How to: Measure the Lateceny and Throughput of Apache / Lighttpd / IIS Webserver

Q. I can measure network throughput and packet loss using standard UNIX / Linux command line utilities. How do I find out the lateceny and throughput of a web server like Apache under Linux?

A. You need to use the program called httping. It allows you to measure the latency of a webserver and the throughput.

Task: Ping the webserver on host

Use the following command for measuring the latency. Press CTRL+c to exit the program. It will display a summary of what was measured.
$ httping -g

connected to, seq=0 time=981.08 ms 
connected to, seq=1 time=709.92 ms 
connected to, seq=2 time=1072.02 ms 
connected to, seq=3 time=903.81 ms 
connected to, seq=4 time=607.84 ms 
connected to, seq=5 time=660.01 ms 
connected to, seq=6 time=730.12 ms 
connected to, seq=7 time=781.49 ms 

The -g url option use selects the url to probe / ping. You can also specify the port with -p port option:
$ httping -g -p 81
You can also connect using SSL, for this to work you need to give a https url or a 443 portnumber:
$ httping -l -g
$ httping -g -p 443

Task: Measure throughput of a webserver

The -G option force GET request instead of a HEAD request – this means that also the complete page/file must be transferred. You also need to pass the -b option with -G option to get the transferspeed (in KB/s).
$ httping -Gbg

connected to, seq=0 time=1738.39 ms  22KB/s
connected to, seq=1 time=1650.19 ms  20KB/s
connected to, seq=2 time=1759.65 ms  17KB/s
connected to, seq=3 time=1589.98 ms  21KB/s
connected to, seq=4 time=3709.87 ms  6KB/s
connected to, seq=5 time=3329.69 ms  7KB/s
--- ping statistics ---
53 connects, 53 ok, 0.00% failed
round-trip min/avg/max = 1451.9/2013.6/11656.0 ms
Transfer speed: min/avg/max = 6/19/24 KB

Please note above in above command you’re no longer measuring the latency!

You can also pass -X option with -G to show the amount of data transferred (excluding the headers):
$ httping -XGbg

connected to, seq=0 time=1576.11 ms  22KB/s 19KB
connected to, seq=1 time=2620.26 ms  9KB/s 19KB
connected to, seq=2 time=1507.69 ms  23KB/s 19KB
connected to, seq=3 time=1522.08 ms  24KB/s 19KB
connected to, seq=4 time=1533.68 ms  23KB/s 19KB
connected to, seq=5 time=1581.92 ms  21KB/s 19KB
connected to, seq=6 time=1512.06 ms  24KB/s 19KB
--- ping statistics ---
7 connects, 7 ok, 0.00% failed
round-trip min/avg/max = 1507.7/1693.4/2620.3 ms
Transfer speed: min/avg/max = 9/21/24 KB

Test remote server CPU

The -B option along with -G option ask the HTTP server to compress the returned data – this will reduce the influence of the bandwidth of your connection while increasing the influence of the processorpower of the HTTP server.
$ httping -BGg

Flood Webserver

The -f option used to flood ping i.e. do not sit idle between each ping but ping as fast as the computer and network allow you to (don’t run this on production or 3rd party servers):
$ httping -fg

Posted by: SXI ADMIN

The author is the creator of SXI LLC and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.

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