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reactingFoam faster on less CPUs

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Old   January 11, 2019, 03:41
Default reactingFoam faster on less CPUs
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I am running a LES combustion case with PaSR (22 species, 124 reactions) on OpenFOAM 6. I tried to run the simulation on 80 CPUs and 16 CPUs. I have discovered that the simulation with less CPUs was running way faster than the other one. The bottleneck is in the calculation of the comustion/chemistry.

Can anybody tell me why this is happening?

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Old   January 11, 2019, 11:00
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1. how many physical cores does the machine have?

2. Have you carried out a scaling study by looking at the speed-up vs Ncores -- typically increasing one node at a time (not core)?
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Old   January 12, 2019, 08:26
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Are you renumbering the mesh? What is the interconnect?
What is the decomposition method?
How many cells?
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