C# Mem Usage In Task Manager - Looks Wrong?

I have an app which ProcExp shows as having 500MB of private bytes assigned to it - This is about right as the app does a lot of data processing

When I see the same process in task manager it report 20MB of usage which is clearly wrong

Why would that be 开发者_开发知识库the case?

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You're probably seeing the Private Working Set of the process in Task Manager (the default view). What you may actually want to look at, however, is the Working Set and/or the Commit Size, rather than just the Private Working Set.

You can change this under Vuew > Select Columns, and selecting the appropriate checkboxes.