Perfmon tip on scaling

Recently on a mailing list, several folks expressed some confusion about the scaling that Perfmon (Performance Monitor) does in its graphs and how it affects the data.

The answer is: it doesn't. The scaling is used only to make the graph fit in the Perfmon window. The values contained in the Last/Average/Minimum fields are not scaled, they are the actual counter values.

If you want to prove this to yourself in another way, click on "Change Graph Type" (ctrl-G for you keyboard folks like me) and select "Report". You'll see the same size of values reported in that list.

If you've never played with Perfmon before (or the entire "Reliability and Performance Monitor" that is part of Vista and Server 2008), you should learn how to use it. It can make debugging performance issues a lot easier.

Until next time...

As always, if there are items you would like me to talk about, please drop me a line and let me know!

Published Thursday, April 10, 2008 7:19 AM by michael


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