This is a quick tip that will help you to track down some information about how much memory your WordPress site is using at various hooks during WordPress’ execution.
Download the free Memory Viewer plugin from the plugin repository. Install and activate it. Now, when you view the source of your website, you’ll see at the very bottom a list of the output from the plugin. Here’s an example:
1 2 3 4 5 6 7 8 9 |
ACTION HOOK: plugins_loaded - 17.27 MBs
ACTION HOOK: setup_theme - 17.28 MBs
ACTION HOOK: init - 18.08 MBs
ACTION HOOK: wp_head - 18.22 MBs
ACTION HOOK: loop_start - 18.24 MBs
ACTION HOOK: loop_end - 18.25 MBs
ACTION HOOK: wp_footer - 18.24 MBs
ACTION HOOK: plugins_loaded - 18.18 MBs
MAX MEMORY USED: 18.45 MBs
|
The plugin displays quite a bit of useful information about where your site is using or wasting memory. If you’re experiencing some slow downs on your site and want to do a little bit of investigation, install the Memory Viewer plugin, troubleshoot, and then disable and delete it.
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Interesting plugin but how do you interpret the results and is it possible to tell from it which plugins, etc, are hogging resources?
Indeed :-(
Quite simple:
1: Write down the results
2: Turn off a couple of plugins, or disable other features
3: Run the test again
4: Repeat…
I just wanted to touch base and let everyone know that I updated the Memory Viewer plugin. It now not only shows you how much memory is being used at certain times in WordPress, but it also shows you data about your MySQL queries and logs CPU time as well. There were quite a few questions on how to interpret the data, and so I wrote more official documentation here:
http://www.inmotionhosting.com/support/edu/wordpress/316-memory-viewer-wordpress-plugin
Thanks for this useful post. I have one question: is it true that the lesser memory my site uses, the faster it is?
Memory usage can drain your server. From my experience most of the hogging activities come from poorly optimized SQL queries. They can add another second or two to your page load speed, sometimes killing the server all together.