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Reply To: Turbulence in closed space

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› Forums › OpenLB › General Topics › Turbulence in closed space › Reply To: Turbulence in closed space

December 3, 2020 at 10:42 am #5392
Adrian
Keymaster

Some questions on the OpenMP issue:

– Did you use the OMP or the HYBRID compilation mode? (I assume OMP?)
– Which if any external environment variables were set up for OpenMP? Especially concerning thread pinning?
– This is probably a dual socket system? If so the results might improve when using HYBRID mode with one MPI process per socket and OpenMP only socket-local [1].

As a sidenote: Using more OpenMP threads than there are physical cores didn’t improve LBM performance on any system / software that I have tested.

[1]: Both binding MPI processes to the sockets and OpenMP threads to the cores