One core always at 100%

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apexnewg

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Oct 8, 2017
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510
Hello! During gaming I noticed a worse performance than I would expect. After checking a bunch of things I realized that no matter how many times I restarted / time went by (it's been about a week since I built my PC) the first thread on my CPU (0) would always be at 100%

Here's an example while running Cinebench (single core):
https://i.imgur.com/Y5TZXTr.png

It's the same for gaming and I'm worried about the same thread constantly being pegged at 100% during all my games, rather than switching around etc

If I change the CPU affinity of the process and disable CPU 0, then re-enable it it will look like this:
https://i.imgur.com/ZKXBE01.png

I've been trying a bunch of different things (disabling hyper-threading, tried the response in this thread: http://www.tomshardware.co.uk/forum/341375-28-only-core-time, tried refreshing Task Scheduler service, ..) but haven't had any success

I'm out of ideas and could really use some help fixing this lol
 
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kanewolf

kanewolf

Titan
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May 29, 2013
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If you are running Cinebench single core and it is maxing out a single core, then it sounds normal to me. It is not required that the scheduler move a CPU bound task between cores. It is usually better to leave it on a single core since that maximized the L2 and L3 cache usage.
 
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A

apexnewg

Prominent
Oct 8, 2017
3
0
510


Thanks for your response! Does the same go for gaming? I was a little worried that it would run 100% on that thread for long durations, especially since it didn't seem to do that for my friends

I should mention the main game I have been testing this on is Rust and have been seeing worse performance with my setup (7900x 4.6GHz, 1080 Ti) than some of my friends' builds (5930k 4.4GHz 980 & 6700k 1080) - I knew I would be sacrificing some performance by going for this chip but decided it was worth it to be able to handle my workload so easily. However I wasn't sure if those results were correct
 
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apexnewg

Prominent
Oct 8, 2017
3
0
510


I just tried another weird test: Running Minecraft (capped at 170 fps) would max out the same (CPU 0) thread and send my temperatures up, yet if I uncap my fps it goes up to 2000+ and the temperatures don't change, disabling and reapplying affinity and setting my fps cap to 170 again only uses about 20% of the thread it gets switched to

I'm so lost as to what could be causing this and really have no clue how to go about fixing it
 
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