Start Up Memory Full
I am getting "start up memory full" and have 8 gigs of memory. I don't know how to figure out what is sucking up my memory. I use Adobe products for my pictures rather than iPhoto (too many issues with iPhoto) but iPhoto library, adobe files and caches, iTunes library all are on my external hard drive. I use MacKeeper to clean up stuff. Apps are the only stuff except downloads and graphic saves on my laptop. I use DropBox and SkyDrive for some of my stuff I need to access on my iPad.
How do I find memory and storage suckers.
Thanks in Advance
MacBook Pro with Retina display, OS X Mountain Lion (10.8.4)