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› Forums › Lattice Boltzmann Methods › General Topics › GPU Examples › Reply To: GPU Examples

May 31, 2022 at 3:11 pm #6597
Adrian
Keymaster

Good to hear that at least the CUDA_ARCH issue is solved.

As for the MPI usage: You are correct in that this is not actually parallelized in the output. Did you recompile (“make clean; make”) after switching to the MPI-enabled config?

How did you configure the SLURM (?) script on your cluster? As you used two nodes of 4 A100 each but only get two outputs instead of 8 leads me to believe that something is also wrong there (we need one MPI process per GPU).

Sadly, setting up a multi GPU simulation correctly is not as straight forward as a plain CPU-only application. However, once we have found a working config for your situation it should work for all apps.