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Reply To: Multi GPUs Calculation

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› Forums › OpenLB › General Topics › Multi GPUs Calculation › Reply To: Multi GPUs Calculation

June 27, 2023 at 10:34 am #7602
Adrian
Keymaster

Ok, this looks as if the wrong MPI version is selected for compilation. Likely you will get a compiler / linker error if you remove opempi-bin and libopenmpi-dev.

Does ompi_info --parsable -l 9 --all | grep mpi_built_with_cuda_support:value return true (as per the user guide)? Did you modify the PATH accordingly?

I would suggest to make sure that the correct MPI version is set and use the flags as provided by mpic++ -showme. (Or you can exactly follow the user guide / tech report).