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Old   November 8, 2017, 10:30
Question Large Grid Partitioning Issues
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Geoffrey Andrews
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Hello, everyone! I am trying to run a large case using SU2 and have hit some difficulties with the grid partitioning. My grid is for a sharp cone (3D) and has 86 million cells, and I suspect that I am running into a memory issue with ParMETIS. I get a series of "PARMETIS ERROR: Poor initial vertex distribution. Processor 384 has no vertices assigned to it!" messages and then this message at the end of partitioning:

"Finished partitioning using ParMETIS (0 edge cuts).
Communicating partition data and creating halo layers.
0 interior elements including halo cells.
0 vertices including ghost points."

Naturally, when the case tries to run, it then gives me a segfault. I have tried running the case with different numbers of processors (512, 864, 1024) and I have also tried leaving each node with 50% of its cores idle for more available memory in each node (maintaining the same overall number of active processors) but I still seem to get the same problem.

Any suggestions?
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grid, parmetis, partitioning, su2

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