Apache memory Increasing Fast
 

I'm having an issue with my server where Apache memory keeps increasing.

You can see a screenshot here: http://awesomescreenshot.com/07avz5p36

I've had to restart Apache a couple times and eventually reboot the server.

I have a feeling it might be related to a plugin so I disabled a few plugins but not much has changed. I upgraded vBulletin to 3.8.7 with little effect.

Any suggestions?

Also is there a way to see what plugins are putting load on mysql? To see how many queries are sent?