Parallel run on x2 zeon is really slow -- CFD Online Discussion Forums

June 18, 2021, 03:10	Parallel run on x2 zeon is really slow	#1
ErenC Member Eren Join Date: Aug 2018 Posts: 86 Rep Power: 8	Hello! I am kind of newbie on CFX, it is not my main CFD solver. We have a x2 zeon processor workstation, I ran 5m case on 24 cores but after 16 hours it only ran 1200 iterations. It is isothermal, MRF, st-st case. Roughly there are 200k nodes per processor, I think it should be much faster. I nearly set-up nothing. I just selected Intel MPI Local Parallel, 24 partitions, changed Memory Alloc. Factor to 1.3 and run it. When I check cpu, 56% of the CPU(with ctrl alt del) is under use and 20 GB ram is being used. If anyone can give me tips of what might be wrong, I will be glad. Eren.

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