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parallel processers Scaling for CFD

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Old   December 9, 2022, 04:15
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Hi there,
I have a query regarding the scaling of parallel processors Simulation for CFD.
what is the scaling law for parallel processing simulation for CFD based on domain decomposition?

I have performed scaling in Openfoam, but need some validation support for it.
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Old   December 9, 2022, 08:12
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In many practical cases, it goes as bad as sqrt(N). If it starts to go even worse than I stopped adding additional threads and stick with sqrt(N).
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Old   December 9, 2022, 09:40
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It depends...
General recommendations for CFD hardware [WIP]

You can get pretty much anything, depending on how you do your analysis. Linear scaling, superlinear scaling, scaling that could be fitted with Amdahl's law, no scaling at all. negative scaling...

Probably a good idea to start with terminology. Are you interested in strong or weak scaling? Intra-node or inter-node?
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Old   December 10, 2022, 05:37
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Quote:
Originally Posted by LuckyTran View Post
In many practical cases, it goes as bad as sqrt(N). If it starts to go even worse than I stopped adding additional threads and stick with sqrt(N).
Thanks lucky for the response.
i will apply this
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Old   December 10, 2022, 05:39
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Quote:
Originally Posted by flotus1 View Post
It depends...
General recommendations for CFD hardware [WIP]

You can get pretty much anything, depending on how you do your analysis. Linear scaling, superlinear scaling, scaling that could be fitted with Amdahl's law, no scaling at all. negative scaling...

Probably a good idea to start with terminology. Are you interested in strong or weak scaling? Intra-node or inter-node?
I will try linear scaling analysis.
Thanks for the response
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