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Pastimes : Windows 10
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From: Don Green7/12/2017 12:15:01 PM
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24-core CPU and I can’t move my mouse

This story begins, as they so often do, when I noticed that my machine was behaving poorly. My Windows 10 work machine has 24 cores (48 hyper-threads) and they were 50% idle. It has 64 GB of RAM and that was less than half used. It has a fast SSD that was mostly idle. And yet, as I moved the mouse around it kept hitching – sometimes locking up for seconds at a time.

So I did what I always do – I grabbed an ETW trace and analyzed it. The result was the discovery of a serious process-destruction performance bug in Windows 10.

The ETW trace showed UI hangs in multiple programs. I decided to investigate a 1.125 s hang in Task Manager:



In the image below you can see CPU usage for the system during the hang, grouped by process name – notice that total CPU usage rarely goes above 50%:

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