[wp-hackers] wp-cache2 performance (was apache 2.2.2 upgrade)

David Chait davebytes at comcast.net
Fri Jul 14 18:27:00 GMT 2006

All the sites I've ever worked on performance problems with have had 
significant performance boosts from wp-cache.  My own site has used 
Staticize (the precursor) to survive a slashdotting.

It really depends on server config.  I mean, I guess it's possible if your 
disk caching sucks (small cache, slow drives, whatever), and your MySQL 
memory caching is huge, and a fast cpu, then dynamically processing the 
pages is faster than wp-cache checking stuff and loading the thing in off of 
disk (especially big pages).  That'd certainly be HD dependent at that 

Otherwise, I'd be shocked that loading a cache file from disk (which should 
be in disk cache/memory for frequent data) takes longer than processing the 
main query, plus running the various transformation code, plus plugins, 
plus...  Just wouldn't make physical sense based on the code execution. 
Well, again, unless disk is slow and cpu is fast -- AND maybe you have an 
opcode cache running, which would significantly impact performance.

Most shared hosts have fast drives, slow SQL, and no opcode cache. ;)


----- Original Message ----- 
From: "Angsuman Chakraborty" <angsuman at taragana.com>
To: <wp-hackers at lists.automattic.com>
Sent: Friday, July 14, 2006 2:07 PM
Subject: RE: [wp-hackers] apache 2.2.2 upgrade

Today I was running some tests with wp-cache 2 as I am planning to upgrade 
my Simple Thoughts ( http://blog.taragana.com ) site to WP 2.0.3. The 
results surprised me.

WordPress 2.0.3 consistently performs better without WP-Cache 2 than with 
it, by a significant margin. I triple checked my results.
Have anyone else tested? Also we experienced more page load failures in 
heavy load (stress testing) with WP-Cache 2 than without.

So you might be better of without WP-Cache 2 than with it.

And yes as Jamie has pointed out WP-Cache 2 is very likely the cause of your 
blank screen problem.

Have a good weekend,

Work: http://www.taragana.com/
Blog: http://blog.taragana.com/

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