Reply To: Turbulence in closed space
Ok, some things you could try:
– Set OMP_NUM_THREADS to 72 to match your physical core count
– Set OMP_PROC_BIND=close and OMP_PLACES=cores
– Try pinning the threads to the cores using likwid-pin [1]
What kind of performance are you observing when using MPI? (Should be reported in the CLI output as MLUPs)
I suspect you are using release 1.3? Our latest release [2] which was published shortly after your initial post changes the entire core data structure and the way propagation is performed, it might be worth to try if this improves your performance results. I have not performed detailed benchmarks using only OpenMP with this latest version but the implementation in this area was simplified significantly.
[1]: https://github.com/RRZE-HPC/likwid/wiki/Likwid-Pin
[2]: https://www.openlb.net/news/openlb-release-1-4-available-for-download/