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July 21, 2022, 10:02 |
Software works weird; Processor 3995WX
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#1 |
New Member
Ilya
Join Date: Oct 2019
Posts: 16
Rep Power: 7 |
Hello.
I ask for advice. I bought an AMD Ryzen Threadripper PRO 3995WX processor and can't use it to its full potential. Problem: The same task in Ansys CFX is solved at different speeds. Each new run of the solution gives a solution at a different speed. test 1 - 3200 seconds test 2 - 900 seconds test 3 - 7000 seconds test 4 - 1400 seconds How to achieve the same minimum solution time? PC specifications - AMD Ryzen Threadripper PRO 3995WX (64 physical cores, 128 threads); - 128 GB RAM; - 512 SSD samsung evo; - no throttling occurs, temperature 50-55 °C; - Windows 10 x64; - Ansys 19.1. Did not help: - disable hyper trading - disable turbo boost - reinstall win to another copy - ssd replacement - Installing another version of Ansys 2021 - installation of all driver and OS updates. Other programs run fine on this PC with the same repeatable results (benchmarks, video encoding, rendering). |
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July 21, 2022, 18:45 |
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#2 |
Senior Member
Join Date: Oct 2011
Posts: 242
Rep Power: 17 |
Can you provide more info on the test case you are running ? How many cells ? Which model ? How many threads are you using ?
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July 22, 2022, 03:32 |
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#3 | |
New Member
Ilya
Join Date: Oct 2019
Posts: 16
Rep Power: 7 |
Quote:
I count in CFX Hydrocyclone of standard design. Includes oil and water. I have run successfully this model before on another computer I tried testing on 4, 10, 12, 16 cores (threads) |
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July 22, 2022, 04:11 |
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#4 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,427
Rep Power: 49 |
Which memory are you using exactly? How is it populated on the motherboard? Which motherboard? Which version of Windows 10?
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July 22, 2022, 04:29 |
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#5 |
New Member
Ilya
Join Date: Oct 2019
Posts: 16
Rep Power: 7 |
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July 22, 2022, 05:01 |
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#6 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,427
Rep Power: 49 |
There should be a memory population guideline in your motherboard manual. Following this is important when using less than 8 DIMMs.
Regardless, you need 8 identical DIMMs to use the full capabilities of this processor. High runtime variance is a direct result of not populating all memory channels. Whether this is the only issue here, I can't tell. But it is definitely a contributing factor. |
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ansys, cfx, solution |
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