OpenFOAM on cluster (ubuntu 12.04 LTS x64)
Dear FOAMers.
It has been a while since I started to use openfoam on cluster. As always, there are problems with openfoam that magically appear and disappear. This thread shall serve as a summary of problems and solutions (hopefully) to them that are connected to cluster computing. Best Regards Martin |
Dear all,
It does not taken so long for first error to appear. I am observing that the choice of the number of cpus is not completely free. Sometimes for a certain number of processors this error appears. Code:
r17:~/OpenFOAM/novakm-2.2.x/myCases/pE/pE_2p2_300>mpirun -np 8 myColdEngineFoam -parallel Does anybody know, where possibly might the problem be? Best Regards Martin |
Hi Martin,
Given that you've been having issues getting the MPI toolbox working with OpenFOAM on your cluster (http://www.openfoam.org/mantisbt/view.php?id=1052), then I suggest that you first do some communication tests. From my blog post Notes about running OpenFOAM in parallel: Quote:
Then related should be the memory limits and later on to confirm if the problem is related to the solver+libraries being used. Best regards, Bruno |
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Great, I ll look on it. The problem is that the case is runable for 1-7 cpus on 8 cpus node, however, sometimes when I want to run on 8 cpus on the same 8 cpus node, the above crash appears. The instalation of OF 2.2.x is the default (OF mpicc 1.6.3 is used from thirdparty). The bug http://www.openfoam.org/mantisbt/view.php?id=1052 was connected with my effort to use the system default mpi (1.6.5), to test, if the problem is not hidden in mpi library. Best regards Martin |
Hi Martin,
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Bruno |
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M |
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