Reply To: Turbulence in closed space
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