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I am running a Drupal 6 site on my server, when I use Linux command top to check the CPU usage, I always get a high figure 80-90% of CPU loading, so my server down frequently.
I have installed over 50 modules,I am going to check which module was caused high CPU usage, could someone suggest how can I check which module was caused high CPU usage(by code or module)?
Thanks
Use Devel module It will give you list of queries run when the page is loaded and the time the query has taken. From there you can check which query is coming from which module.
There are many performance improvement module you could try with.
You could use too much of cache if you site has most of the static pages.
Empty cache,Execute PHP Code,Function reference,Hook_elements(),Node_access summary,PHPinfo(),Rebuild menus,Reinstall modules,Session viewer,Theme registry,Variable editor
Feb 2, 2012 at 6:51
I'd also try a PHP profiler which gives you a lot of metrics. Take a look at the XHProf module. Here is an excerpt about it from the module's project page:
... allows you to profile your Drupal application using the XHProf profiler from facebook.
It also provides a native Drupal UI (as opposed to facebook's original php front end) to view the profiling data. Having this in Drupal provides several advantages:
- Simpler setup
- No need to setup extra vhosts
- Limit access via roles and permissions
- Use alternative storage backends such as MongoDb
Might not be the answer you're looking for, but I'd look at disabling all modules (in a test environment if you can't do this on the same machine), then enabling them one at a time until the load hits an unacceptable level.
