How do I permanently set cpu affinity on my servers? Every time I restart my rust server, it goes back to using all 8 threads. I'm on linux btw.

One more thing. Is this necessary for running multiple servers?

I will be answering my own question again. It is not necessary on linux and I have waisted my time. Problem solved I guess

On windows, use the start command and select the mask for core affinity

start /WAIT /HIGH /AFFINITY 0x8000 RustDedicated.exe -batchmode .........

https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/start