How come sys.dm_exec_requests.cpu_time never moves?

(JackLi) Today, I want to point out another SQL Server 2012 SP2 fix that may affect your performance troubleshooting. When you are troubleshooting a long running query, chances are you will use sys.dm_exec_requests to look for progresses of the query. But one of the column – cpu_time is not accurate

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How come sys.dm_exec_requests.cpu_time never moves?

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