I know that a lot of people understand the power of caching, but the numbers are elusive and difficult to pin down with real experiments. I saw an experiment online that tested and compared high load servers and decided to use the recently published staticise plugin as my test bed.
I ran two seperate test sets, one with a vanilla WordPress 1.2 install with 20 posts on the main page and about 25 links in the link manager.
The second set was on the same blog with Staticise 1.2 default install, no tweaks.
This was run on a RedHat 9 machine with 512 megs of RAM and an Athlon 1000Mhz processor running its own MySql server. There was no network involved (localhost) and I did not have any other hosts hitting the machine with Apache requests. Apache Bench was used to create the results.
As was demonstrated on the Mambo Forums, the server was hit with 5 simultaneous connections every second for two minutes while apachebench recorded load average every ten seconds.
The script used was a highly modified version of the one found in the above forums. If you want something that works well with RedHat and bash, let me know.
Here are the results. They speak volumes for themselves. If you are worried about WordPress’ page load times or slashdotting, get this plugin.