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snappyHexMesh parallel speedup?

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Old   August 19, 2014, 18:01
Default snappyHexMesh parallel speedup?
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Pete Bachant
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Does anyone know of any case studies for speeding up snappy in parallel? I am getting OpenMPI errors when I try to run on more than one node and I was wondering if it's worth it to spend significant time troubleshooting.


Looks like I can get it to run on multiple nodes, so long as I don't use every core on each. Speedup seems pretty good so far. Went from ~5 ks on 6 processes to ~1 ks on 24 processes for a mesh ending with 8M cells.
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Last edited by pbachant; August 20, 2014 at 14:06. Reason: Add update
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Old   September 11, 2014, 11:42
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Hi Pete,

I use these steps and of course get a faster meshing process with SHM.

1. decomposePar
2. foamJob -p -s snappyHexMesh
3. reconstructParMesh -mergeTol 1e-06 - latestTime

Good Luck
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