Multi-core CPU not working all threads


I’ve been trying to build a really powerful system to do my animations, but keep getting side-swiped by technicalities. The latest problem. I saved up and bought a 2x 18-core xeon work station. All 36 cores/ 72 threads are showing in the task manager (win7), but when I run cycles, I notice only 36 actually do anything. How can I get all 72 thread (or 64) to function?


You could search this forum section a bit more - there was a similar thread and afaik post resulted into some changes introduced in Cycles concerning amount of used threads.
Another tip comes from this thread-

Mind that most of your cores will be bored during modeling sessions, there’s not much of multi threading going on.