[snappyHexMesh] snappyHexMesh parallel speedup?

pbachant · August 19, 2014, 18:01

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.

UPDATE:

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.

Metti · September 11, 2014, 11:42

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

August 19, 2014, 18:01	snappyHexMesh parallel speedup?	#1
pbachant Senior Member Pete Bachant Join Date: Jun 2012 Location: Boston, MA Posts: 173 Rep Power: 13	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. UPDATE: 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. __________________ Home \| Twitter \| GitHub Last edited by pbachant; August 20, 2014 at 14:06. Reason: Add update

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September 11, 2014, 11:42		#2
Metti New Member Mehid Join Date: Nov 2013 Location: Tehran-Iran Posts: 22 Rep Power: 0	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