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September 9, 2009, 09:15
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MRFsimpleFoam + Porosities in parallel
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Senior Member
BastiL
Join Date: Mar 2009
Posts: 530
Rep Power: 20  |
Dear all,
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): FLUENT: 2Core: 13,739s 4Cores: 5,594s 8Cores: 3,458s 16Cores: 1,609s 24Cores: 1,215s 32Cores: 950s This looks quite reasonable for me. Same model on OpenFOAM: 8Cores: 12,752s 16Cores: 14,647s 32Cores: 20,444s 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? Regards BastiL Last edited by bastil; September 9, 2009 at 09:39. |
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September 9, 2009, 10:39
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#2 |
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Senior Member
BastiL
Join Date: Mar 2009
Posts: 530
Rep Power: 20 |
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.
Regards BastiL |
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