Windows 10: Default affinity for applications set to only use first 4 cpu cores.

The title basically says it all. Recently for some reason most processes are launched with a default affinity set in task manager to only use the first 4 processor cores/threads. I have an 8 core 16 thread cpu, so this is utilizing only 1/4 of the CPU and I have noticed a significant decrease in performance. I understand I can manually change the affinity, but doing that for every program each time i reboot my PC is not a solution, so please do not suggest it. I want to figure out why this happened, and fix it.

:)

 

How to set 8 core cpu in affinity settings

Here is how to set your affinity settings using 8 core cpu splitting them into two 4 cpu cores

cmd.exe /c start "WoWSLauncher" /affinity F "C:\Games\World_of_Warships\WoWSLauncher.exe"

As you can see I added "F" next to /affinity that will let you use just 4 cores 0,1,2,3

I can do it easy in task manager but got to keep doing it everytime i want to play the game.

So if you want to use 0 1 2 3 cores just for the game you would add "F" in your line like so..

for cores 4,5,6,7 Do this....

Add F0 next to /affinity like so

cmd.exe /c start "obs32" /affinity F0 "C:\Program Files (x86)\obs-studio\bin\32bit\obs32.exe"

cmd.exe /c start "obs64" /affinity F0 "C:\Program Files (x86)\obs-studio\bin\64bit\obs64.exe"

Depends on if using 32 or 64bit of the os.

If doing it for obs it will not work as it can't find locale\eng-US.ini and failed to load locale but file is there.

So thats how you would set your affinity settings splitting 8 cores into two 4 cores

Am using windows 10.

You want to use 0,1,2,3 for the game and 4,5,6,7 for obs.

Only thing is that it does not save the settings of affinity after you exit the game it will return back to 8 cores when you start the game again.

So if anyone knows how to Save the settings then please post here as i have hunted on the net for awhile now.

 

affinity level CPU

I have a program that starts running too much CPU usage. The last time this program did this it was on an over the top 36 core something or other laptop, I like to call it the Unicorn laptop. To solve the issue I set the affinity level down to 8 cores from task manager details tab. I have a different laptop today which uses only has 8 affinity cores. For this one my program does not work correctly unless I set the affinity in the Task Manager to CPU 0. (uses too much CPU percentage).

In the previous laptop with 36 affinity cores I could set this in msconfig boot advanced options, so that it does it automatically when the PC boots. The problem now is when I try to do this through msconfig in my 8 core laptop so that it will do this automatically in startup it does not work. There is a dropdown for 1 to 7. I set it to one and reboot the PC and my program or the CPU usage does not take effect.

 

Unable to set core affinity

I haven't played with setting core affinity in a long time. I also don't use the Steam ecosystem.

If there are multiple processes under a single heading, "Go To Details" isn't available for the whole set. It is available for individual processes. I hope that it's easy for you to determine which of those is appropriate. An example from an uninteresting application: