I released a free tool this week in conjunction with the Inside the Microsoft OS session at briForum 2007 this week. My site was unfortumately down during the session so I wanted to post an update on where you can get this tool, and a little bit about it for those who were not in the session.
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Links for the 32 and 64 bit versions may be found at http://www.tmurgent.com/Tool_ATM.aspx . There is no installer, just an exe to unzip and run.
This tool lets you look at file cache memory usage and effectiveness. It is particulatly interesting to run on Vista/Longhorn due to the changes in those operating systems - especially SuperFetch. SuperFetch is an advancement in system file caching, which traditionally only holds onto files being used. SuperFetch actually reads files into a low priority standby pool in anticipation that the user is likely to want it soon. See the web page for more information on this tool.