#3 CPU Spikes


  1. Posts : 2
    Windows 7 Ultimate 64 bit
       #1

    #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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  2. Posts : 2,528
    Windows 10 Pro x64
       #2

    If you look at it with resmon, is it any one process specifically that spikes up during this time?
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  3. whs
    Posts : 26,210
    Vista, Windows7, Mint Mate, Zorin, Windows 8
       #3

    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.
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  4. Posts : 2
    Windows 7 Ultimate 64 bit
    Thread Starter
       #4

    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?
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  5. whs
    Posts : 26,210
    Vista, Windows7, Mint Mate, Zorin, Windows 8
       #5

    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.
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  6. Posts : 5,642
    Windows 10 Pro (x64)
       #6

    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.
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