khkhiu.github.io documentation

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Contents:

• Disabling SMT cut our OpenFOAM HPC Challenge runtime by 17%, on half the cores
  • Background
  • The experiment
  • Result
  • Why it is faster
  • Validating that the physics remained consistent
  • Known issues and open items
  • Next up
• Optimizing OpenFOAM’s occDrivAer Case for the APAC HPC-AI Competition
  • 1. What the APAC HPC-AI Competition is
  • 2. What OHC-1 is
  • 3. The occDrivAer case itself
  • 4. Decomposition methods, what they are and how they differ
  • 5. Renumbering, what RCM means
  • 6. What every top OHC-1 hardware-track submission actually used
  • 7. Rank count, the cells/core sweet spot
  • 8. Settings to try, summary checklist
  • 9. Key takeaways
  • References
• occDrivAerStaticMesh on Vanda: A 1-Node Decomposition and MPI-Binding Study
  • 0. Background: what problem is being solved, and what the vocabulary means
  • 1. Setup
  • 2. Decomposition shape sweep
  • 3. Discovery: node-to-node contention on a shared cluster
  • 4. MPI rank-binding sweep
  • 5. A note on OpenFOAM’s built-in profiler
  • 6. Summary and recommended configuration
  • 7. Recommendations for the scored 4-node run
  • Appendix: glossary quick-reference