A few times I've noticed my MacBook Pro (M1 Max) running warm despite "no apps using significant energy," and Activity Monitor shows pdc using 100% CPU constantly. (I had been running the Simulator previously but exited it, and I haven't used pdc via the command line at all. It has been days since I built to the Simulator, which I do from Nova.)
So I force-quit pdc from Activity Monitor, but maybe there's something that keeps it doing... something when not needed?
This is SDK 1.9.3.