Why is my Unity server vCPU usage unexpectedly high?

Unity has an issue where it incorrectly determines the number of threads available to it when running in a container. The result is that vCPU usage becomes much higher than expected.

Try setting the job worker count (JobWorkerCount) to a lower number (e.g. 4):

• in a startup script: JobsUtility.JobWorkerCount = 4;
• via command line argument -job-worker-count 4

You may need to tweak the job worker count value to find teh optimal one for your use case.

Relevant Unity docs:

• https://docs.unity3d.com/ScriptReference/Unity.Jobs.LowLevel.Unsafe.JobsUtility.JobWorkerCount.html
• https://docs.unity3d.com/ScriptReference/Unity.Jobs.LowLevel.Unsafe.JobsUtility.JobWorkerMaximumCount.html