I experienced a problem after upgrading a server from 1TB RAM to 2TB RAM (yes,
really RAM) in our dual socket AMD EPYC machine with 48 cores/96 threads under
Windows Server 2016. If I render a scene with 3500x1750 pixel, half of the cores
are used (Windows processor group stuff) and the performance is quite nice. If I
increase the resolution to 3600x1800 pixel (or more), it starts with 48
threads/24 cores, but performance is bad and after several seconds, just one
core/thread is doing all the work. Rendering can also not be stopped and runs
till the end.
I never experienced such a problem before. Do you have any ideas?
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