Number of CPU cores used does not increase speed! -- CFD Online Discussion Forums

September 24, 2021, 08:47	Number of CPU cores used does not increase speed!	#1
Styralf New Member adad Join Date: Sep 2021 Posts: 3 Rep Power: 4	Hello, We bought an new computer for CFX calculations. It has an AMD Threadripper 32 core processor and 256Gb 3600Mhz DDR4 Ram. When I test the speed performance of each simulation, it is the same using 32 partitions or 64, even 20 partitions runs at the same speed. I have tried to disable SMT mode and this did not help either. I also tested to run two simulations on the same time, each using 32 cores each. This resulted that each simulation would take 2x longer time. Anyone know what the problem might be?

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