MRFsimpleFoam + Porosities in parallel
I have massive trouble with the parallel scaling of MRFsimpleFoam on our cluster. The solver has been slightly modified (added porosities) and is from the 1.5-dev. It contains some ggis - this might be important for parallel performance. I compare with FLUENT runs from 1 to 32 cores on a myrinet cluster and so far I have (still running):
This looks quite reasonable for me. Same model on OpenFOAM:
Very strange - slowdown instead of speedup and in general very slow.
Are there some specialities for ggi, MRF and porosities in parallel? What might be wrong? May it be worth trying a benchmark case? which? Any ideas?
Ok after investigating little further this improves rapidly as soon as tuning of ggis (even keeping same decomposition). GGI-performence in parallel still seems to be an issue for large cases running on more than 8 cores.
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