Learning Forum

[kevin1986]

 

This days we did the test again. In one workstation (amd epyc 7402 CPU, 16*16G RAM, windows 10 and win server 2019), we installed ANSYS Fluent 2020r2 and 2021/2022/2023. Fluent 2020r2 is much faster than others. By a deep investigation, it comes from the extremely low bandwidth, no matter its intel2018 or intel2019/2021. 

This problem does not exist in CentOS. In CENTOS, ANSYS Fluent 2022's speed is the SAME with 2020r2. 

I would suspect it is a bug only happed in windows and I hope the tech can double check this issue. 

This is the updated version of this topic: https://forum.ansys.com/forums/topic/fluent-2022-r1-slow-bandwitdth/

 

I am sorry about the picture. but it looks too big...

[kevin1986]

I can make it clearer. The tests I did are quite simple. So I dont think I made any mistakes:

1) prepare 4 SSDs, install different Fluent versions;
2) run them and compare the speed;

[kevin1986]

More findings:  

1) For Fluent 21/22/23, msmpi is much faster than intelmpi. 

2) Using msmpi, Fluent 21/22/23 is slower than Fluent 2020 with intelmpi.

[kevin1986]

I am wondering if someone can give me a hint😀

[kevin1986]

And if it is possible to pay to handle this problem. I am also willing to do it. Please let me know.

[Mangesh Bhide]

Hello. Please refer to details of tested hardware and software configuration in
https://www.amd.com/system/files/documents/AMD-EPYC-7002-AnsysFluent-Scalability-Performance.pdf

[kevin1986]

Hi Mangesh, thanks for your info. I downloaded lots of these documents and printed them. Unfortunatelly, they are tested in linux system. In linux, I did not see this issue either. This issue I reported ONLY happens in Windows system. Unfortunally I cannot find any information that can help me to handle this problem. 

If it is possible, I would like to sign a contract to suppot ANSYS to debug further about this issue. 

Thanks.

[Mangesh Bhide]

Hello,

Please contact your local Ansys Sales office.