#3 CPU Spikes

[revoke1337]

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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[cluberti]

If you look at it with resmon, is it any one process specifically that spikes up during this time?

 

[whs]

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.

 

[revoke1337]

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?

 

[whs]

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.

 

[logicearth]

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.