Current Bottlenecks in the Scalability of OpenFOAM on Massively Parallel Clusters
| Main Author: | Massimiliano Culpo |
|---|---|
| Format: | info publication-workingpaper Journal |
| Terbitan: |
, 2012
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/807482 |
Daftar Isi:
- The scaling behavior of different OpenFOAM versions is analyzed on two benchmark problems. Results show that the applications scale reasonably well up to a thousand tasks. An in-depth profiling identifies the calls to the MPI_Allreduce function in the linear algebra core libraries as the main communication bottleneck. A sub-optimal performance on-core is due to the sparse matrices storage format that does not employ any cache-blocking mechanism at present. Possible strategies to overcome these limitations are proposed and analyzed, and preliminary results on prototype implementations are presented.