EPYC based workstation for OpenFOAM simulations

flotus1 · May 30, 2018, 07:49

Mixing ranks is definitely the worst idea. If you want to use different RAM for whatever reason, at least make sure the DIMM organization is identical.
Btw, I don't see how my last comment concerning RAM contradicts what I wrote previously.

klilla · May 30, 2018, 09:29

Dear All, who try/use epyc processors with openfoam. What is your experiences? I mean, I have tested two epyc workstations and, well, they behave strangely with openfoam.

I ran an LES test case with interFoam - so VoF - with 28M cells. I tested intels and amds, different ages, I know it is not fair, but I tested everything I have/had access to. Now, all of them is scaling, except epyc. I could push this test case with close to linear scaling up to 512 processors, meaning, that epyc should really scale beyond 32 - which is the 'CPU increase'=1 in the attached figure.

Do you have other experiences?
Thanks,
Lilla

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May 30, 2018, 07:49		#21
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,399 Rep Power: 46	Mixing ranks is definitely the worst idea. If you want to use different RAM for whatever reason, at least make sure the DIMM organization is identical. Btw, I don't see how my last comment concerning RAM contradicts what I wrote previously.