Is FDS optimized for Intel or AMD?

[Undi]

Hi, dear developer,

I want to know which type of CPU shows better performance because I am assembling a workstation.

Is FDS optimized for Intel or AMD? There is rare information in this field.

I tested Intel Xeon 2680V4 (Dual) and AMD 3990X. But I found Intel is relatively faster when running multiple cases.

For example, I would run 28 cases for 28 cores Intel and 64 cases for 64 cores AMD at the same time for a total of 500 cases using Python scripts. This is because I want to use a single core to run one case instead of using MPI. This is faster and I want to do sensitivity analysis.

Intel costs about 5000 seconds while AMD costs 3000 seconds for 500 cases, respectively. 

This means Intel would cost 10 seconds while AMD would cost 6 seconds for 1 case on average, respectively. 

Even though AMD has a higher main frequency (2.9 GHz versus 2.8GHz) but it doesn't show better performance than expected. 

Considering AMD has 2.3 times more cores than Intel, AMD is relatively slower. Since second-hand Xeon is extremely cheaper now, maybe using a new AMD is not a good choice.

Is FDS optimized for Intel?

By the way, do you have any suggestions about choosing a CPU? 

Yours, Wang.

[Kevin McGrattan]

We use the Intel Fortran compiler, but we do not use any optimization settings that are targeted specifically to Intel processors. I suggest that you compile FDS with both Intel Fortran and Gnu Fortran and compare performance.

[Undi]

Thanks, Kevin,

I noticed the performance of OpenBLAS on AMD shows better performance than MKL on Intel.

May I ask which library was used in FDS Fortran source code?

Yours, Wang

[Kevin McGrattan]

MKL

[Undi]

Thanks, Kevin. 

Then I should use the Intel platform because MKL show relatively worse performance in AMD.

在2021年12月24日星期五 UTC+8 01:19:44<Kevin> 写道：

MKL

[TasKall]

Dear all,

I am planning to run FDS cases in MPi mode (except you have other suggestion).

What is your pinion about my two options (I simple add the basics, CPU and memory) with windows OS? 

1. CPU: 2x Intel Xeon E5-2650 Memory: 64 GB Ram 

2. CPU: AMD Ryzen 9 7950X Memory: 32GB Ram

Thank you in advance

[Glenn Forney]

If you can run your case now on these two computers why not do this for a short time and see what'd happens. Is one better than the other? With 64gig you can run bigger cases but it is not clear at least to me which can run faster .  

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