JMeter showing no response time difference between caching enabled vs disabled
This just doesn't make any sense to me, I must be missing something here. Here's the story...
So before I upgrade my site to Drupal 6 I thought it would be interesting to do a performance comparison between my existing Drupal 5.3 site and the upgraded site on version 6. I setup a simple performance test case using JMeter that simulates 10 concurrent users accessing my site's homepage. Long store short, I noticed my first test run was executed with caching turned off. No problem I thought, I'll turn caching on (and css compression) and rerun the test. However, when I reran the test the performance results were almost identical.
How can this be? I have to be missing something here, my apologies if it's something obvious.
Thanks in advance,
JasonJ
Could be a few things ...
The big one is that the cache will have no affect for logged in users ...
Also - POSTS and anything that causes a message (via drupal_set_message) to display won't be cached - oh and the cache will be cleared after every node update / insert, so if your tests involved adding/editing content then this might be having an effect ...
Cheers,
Mike,
Computerminds offer Drupal development, consulting and training
CSS compression is important
CSS compression/aggregation is important if you've got a lot of modules as the time needed to fetch all the CSS files can be substantial if you have many modules enabled. Have you tried with and without aggregation for logged-in users?
When doing optimization tuning, it's important to control one variable at a time :)
Response
Thanks for the replies.
The test case does not "login" so it should be representative of an anonymous user access.
It wasn't in my original post but I did actually enable each performance option separately (I'm a developer at heart :) ) , first the site caching then the CSS compression/aggression. The results were surprisingly the same.
I suppose it could be the content on my site. The site is basically a random blog where I post misc funny items to share with friends, www.lehmdogg.com. BUT a lot of my posts have YouTube videos embedded in the posts...and now that I think about it the performance of rendering each video (player) on the page wouldn't change whether caching was enabled or not right?
I have other sites with mostly text I can use as a benchmark, I just picked this site because I figured it was the first site I'd migrate to Drupal 6.
Am I thinking of this correctly?