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Openfoam speed up performance

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Old   December 31, 2018, 11:47
Default Openfoam speed up performance
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Andrew
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Hi guys, first of all, Happy New Year!

I wanted to ask you a kindly information, I am a beginner with problems of this kind.

As for the parallel calculation in openfoam, hypothesize to have available some hardware, which parameters are the most influencing the speed up?

What decompositions of the domain are efficient to improve speed up for external aerodynamic problem? in general what are the important parameters? how do you deal with a problem like this?

Thank you in advance for the time spendt to read this message.
Astan
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Old   January 8, 2019, 12:04
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Geir Karlsen
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Quote:
Originally Posted by Astan View Post
Hi guys, first of all, Happy New Year!

I wanted to ask you a kindly information, I am a beginner with problems of this kind.

As for the parallel calculation in openfoam, hypothesize to have available some hardware, which parameters are the most influencing the speed up?

What decompositions of the domain are efficient to improve speed up for external aerodynamic problem? in general what are the important parameters? how do you deal with a problem like this?

Thank you in advance for the time spendt to read this message.
Astan
I consider memory bandwith to be most important for speed up. Typically you can make good use of 2-3 CPU cores pr. memory channel on a DDR4 system. More cores than that gives no speedup. I can highly recommend the hardware sub-forum: https://www.cfd-online.com/Forums/hardware/

Even got benchmarks
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