I understand the actual time slice is variable depending on several factors such as the OS and the processor.
But is there a way I can make a thread count the time slice allotted to it during the time it has the CPU to itself?
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GhostCat
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Water Cooler v2
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1use tools in sysinternals to check? – Lei Yang Apr 19 '17 at 07:42
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Duplicate of http://stackoverflow.com/questions/1393006/how-to-get-the-cpu-usage-per-thread-on-windows-win32 ? – Matthew Watson Apr 19 '17 at 07:56
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And for the record: I like this question. It gives food for thought; and implementing something where a thread can measure its own utilization sounds like an interesting challenge! – GhostCat Apr 19 '17 at 08:02
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@GhostCat: Thank you. :-) – Water Cooler v2 Apr 19 '17 at 08:11
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Interesting question; but I think: probably not.
In order to measure this from inside the thread, the thread needs to know about two events:
- Thread is started/resumed; gets CPU time; and starts running
- Thread is "suspended", and stops execution
From there: even if you find a mechanism to tell a thread "you have just been resumed" - how could you tell the thread when it was suspended? In other words: you would need two hooks, that somehow notify the thread not only about "you are resumed"; but also about "you will be suspended soon"; so that the thread itself can do its bookkeeping.
Given your comment: yes, if the underlying OS allows to determine the duration of a CPU slice and the duration time is constant; then the thread would not need to know about "event 2".
GhostCat
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Thank you. I was doubtful too because of the reasons you mention. If that's not possible, would it be possible to just read a variable from an operating system structure that tells you how much a time-slice measures? – Water Cooler v2 Apr 19 '17 at 07:52
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I updated my answer; but still on the meta-level; as I am missing the in-depth .Net and Windows OS knowledge to give a really technical answer. – GhostCat Apr 19 '17 at 08:01