Application Pool Memory Usage

Is there any way to see my memory usage or can you make any suggestions on 3rd part tools that would give me such information?

 

I'm afraid there isn't any way to expose that information for a shared server.

 

If I get 500mb of site memory allocation, how do I know how much of that is in use?

 

You can't know. It isn't because we don't want you to know, but there's no method to display it to you on a server that's shared by hundreds of sites.