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Track down High CPU in User Mode Applications – A live debug!

NTDebuggers, I’d like to talk about a common issue we deal with on a regular basis. We are often tasked with finding what functions are using CPU within a user mode process / application. Typically a user will find an application that is using more CPU then they expect it to, and this can affect overall system performance and responsiveness.

For this exercise I’ve written some contrived sample code called EATCPU.  It’s included at the bottom of the blog post.    The following image of task manager shows EATCPU consuming 41% CPU time.   A customer or user may tell you this does not “normally” happen.  It’s always good to ask what “normal” is.   In this case we will say normal is ~10%.

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