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Windows 7: #3 CPU Spikes

21 Apr 2011   #1

Windows 7 Ultimate 64 bit
 
 
#3 CPU Spikes

Hey, i just noticed (no idea how long this has been going on for) every few seconds CPU #3 (none of the others, 1, 2, 4) spikes to 100% for about 2 seconds then drops back down in almost a timed fashion, as you can see from this screen shot below....Any ideas on what this can be? (i also confirmed from resource monitor, so its not just the gadget)



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My System SpecsSystem Spec
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21 Apr 2011   #2

Windows Server 2008 R2
 
 

If you look at it with resmon, is it any one process specifically that spikes up during this time?
My System SpecsSystem Spec
21 Apr 2011   #3
whs

Microsoft Community Contributor Award Recipient

Vista, Windows7, Mint Mate, Zorin, Windows 8
 
 

It is not unusual that the cores are unevenly used. During certain operations, it is often one or the other core (or a combination of 2) that takes the load. As Cluberti says, find the process. You can also look into Resource Monitor > CPU tab - just let it run in a reduced size window.
My System SpecsSystem Spec
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21 Apr 2011   #4

Windows 7 Ultimate 64 bit
 
 

Everytime the core #3 spikes "System Interrupts" spikes to 25% of my total cpu (using all of the third core, with 4 cores)

how can i tell what is causing this?
My System SpecsSystem Spec
21 Apr 2011   #5
whs

Microsoft Community Contributor Award Recipient

Vista, Windows7, Mint Mate, Zorin, Windows 8
 
 

Run this program ( DPC Latency Checker ). If you get red bars, you most likely have a driver problem.

You can also run Process Explorer for a quick check. If the DPC (deferred procedure calls) runs a lot (more than 1%), then you may have the stated problem. The DPC process is normally the third from the top.
My System SpecsSystem Spec
22 Apr 2011   #6

Windows 7 x64 (SP1)
 
 

BTW....using 100% of a core is in fact a good thing. Why spend all that money if you are never going to fully utilize that hardware? As you said it last for about 2 seconds, from that it doesn't sound like something you should be concerned about. Especially when you are running all those applications.
My System SpecsSystem Spec
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 #3 CPU Spikes





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