HELP! The response(Not calculation) speed of FLUENT on Win10 is slow

TStones · February 21, 2023, 05:05

Hey guys,

The OS of my workstation is win10 21H2(19044.2251), and it has 2 AMD EPYC7601 32-core processor and 128G of RAM. I always set the parrallel solver processor to 64 and it's calculation speed seems barely satisfactory when I use fluent. However, it costs me lots of time to read cases and set parameters. The fluent UI always response slowly and I think it is not normal.

For example, it cost 24s when I turn on the energy equation, 15s when I change the material of a zone and 30s when I change the scheme in Solution Methods from SIMPLEC to SIMPLE. It is even slower than my laptop(an 8-core Intel i7-10875H CPU @ 2.30GHz and 32G of RAM)!

What maybe the reason of this problem? Thank you very much for any suggestion!

TStones · February 27, 2023, 05:28

Hello, everyone,

I have solved this problem. It seems to be caused by fluent versions.

At the beginning, I found I could not use fluent 2022R1 with the message "Process affinity not being set" on TUI console. Someone said I should change the MPI Type from default to msmpi because of my AMD processors. However, this caused low cpu efficiency. I am sorry I forgot to say that before because I did not realize it may be the reason.

Now, I use fluent2020R2 instead and all of the problems have disappeared.

Liverpool · March 6, 2023, 19:03

Disabling hyper-threading in my laptop's BIOS did wonders for the speed of my PC, both during simulation, and when not simulating working in the fluent GUI or Workbench.

How to do it differs from PC to PC, so I'm just gonna tell you to DYOR and take full responsibility before changing any settings in your BIOS.

Highly recommend since we both are using intel mobile CPU's with hyperthreading enabled. Also, fluent DOES NOT use hyperthreading even when enabled.

Let me know if this helped

Cheers,
7-0

February 21, 2023, 05:05	HELP! The response(Not calculation) speed of FLUENT on Win10 is slow	#1
TStones New Member Wu Jieping Join Date: Feb 2023 Posts: 3 Rep Power: 3	Hey guys, The OS of my workstation is win10 21H2(19044.2251), and it has 2 AMD EPYC7601 32-core processor and 128G of RAM. I always set the parrallel solver processor to 64 and it's calculation speed seems barely satisfactory when I use fluent. However, it costs me lots of time to read cases and set parameters. The fluent UI always response slowly and I think it is not normal. For example, it cost 24s when I turn on the energy equation, 15s when I change the material of a zone and 30s when I change the scheme in Solution Methods from SIMPLEC to SIMPLE. It is even slower than my laptop(an 8-core Intel i7-10875H CPU @ 2.30GHz and 32G of RAM)! What maybe the reason of this problem? Thank you very much for any suggestion!

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February 27, 2023, 05:28		#2
TStones New Member Wu Jieping Join Date: Feb 2023 Posts: 3 Rep Power: 3	Hello, everyone, I have solved this problem. It seems to be caused by fluent versions. At the beginning, I found I could not use fluent 2022R1 with the message "Process affinity not being set" on TUI console. Someone said I should change the MPI Type from default to msmpi because of my AMD processors. However, this caused low cpu efficiency. I am sorry I forgot to say that before because I did not realize it may be the reason. Now, I use fluent2020R2 instead and all of the problems have disappeared.

March 6, 2023, 19:03		#3
Liverpool New Member Bilal Hassan Join Date: Jan 2023 Location: Miami, FL Posts: 4 Rep Power: 3	Disabling hyper-threading in my laptop's BIOS did wonders for the speed of my PC, both during simulation, and when not simulating working in the fluent GUI or Workbench. How to do it differs from PC to PC, so I'm just gonna tell you to DYOR and take full responsibility before changing any settings in your BIOS. Highly recommend since we both are using intel mobile CPU's with hyperthreading enabled. Also, fluent DOES NOT use hyperthreading even when enabled. Let me know if this helped Cheers, 7-0