I have a multi-threaded C# application. Most of the time all the CPU cores are occupied 100%. But during a certain period, the CPU sage drop down to <30%, how can I detect what cause this?
And How can I identify the code consuming the CPU much?
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2Have you considered using a profiler tool? – John Saunders Mar 22 '14 at 03:30
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I don't know which one to use. I am currently trying to learn one. – smwikipedia Mar 22 '14 at 03:30
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JetBrains dotTrace. 'Nuff said. – NathanAldenSr Mar 22 '14 at 04:09
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No, this usually requires a concurrency analyzer. Visual Studio has a very good one, worth the price of the premium edition. – Hans Passant Mar 22 '14 at 08:01
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Do you want to detect what causes CPU at 30% or 100%? If you want to detect 30% then how do you expect an application to determine the cause of a lower load? – paparazzo Mar 23 '14 at 02:55
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How many threads are there in your application ? Have you analyzed what is the code that is getting executed in each threads. Are there lots of locks on shared data and hence causing resource contention? – Venki Mar 24 '14 at 07:12
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In Visual Studio you can set a breakpoint and use the parallel stacks viewer. and here
You could also create a memory dump of the process (using the task manager) and have a look at the threads in visual Studio or open the dump in WinDBG.
WinDBG is very useful when the process is stuck or when you want to have a look at either memory and/or find threads that are deadlocked
