Why Is Unreal Only Spawning 1 Shader Compile Worker

Development Platform & Builds
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1

I’m using UE4.25 (Haven’t upgraded due to being mid-project), and when I package via UAT it only lists a single shader compile worker.

I’ve got a Proxmox VM running Windows 10 with 6 cores dedicated to it as my build machine. I’ve gone into BaseEngine.ini and changed NumUnusedShaderCompilingThreads to 1, but I still only see “Worker (1/1)” when running RunUAT.bat with the BuildCookRun command.

Cores 4, 5, and 6 are listed as “Parked” in Task Manager

Any suggestions?

Thanks!