You can run RC on multiple GPUs on different nodes. You just need to provide mapping from MPI rank to CUDA device ID on a particular node. You can do it using **-devices** argument.

[Dcn303]

    You can run RC on multiple GPUs on different nodes. You just need to provide mapping from MPI rank to CUDA device ID on a particular node. You can do it using **-devices** argument.

Example: You want to run simpleFoam on four GPUs spread across two nodes. The first node will host MPI ranks 0 and 2, the second node will host ranks 1 and 3. Then your command line argument should look like this:

mpirun -np 4 -hosts ... simpleFoam -parallel -devices "(0 0 1 1)"

The list after -devices tells RC to use devices with ID 0 for ranks 0 and 1, and devices with ID 1 for ranks 2 and 3.

Originally posted by @daniel-jasinski in #24 (comment)

[Dcn303]

Sir @daniel-jasinski
I have 10 HPC nodes each node having 2 GPUs hence i have a total of 10x2=20 Gpus
Then sir how exactly would i write the simpleFoam command to run parallely accross those GPUs
i did not get the exact command as specified in issue #24
sir please help in this regard
Thank you sir