Reply To: Multi GPUs Calculation
Indeed, 2.5e11 cells are an extremely large problem. You will need 19 TB of GPU memory for the lattice alone (without any overhead). You will need access to a large fraction of a large GPU cluster for this.
Heterogeneous processing (dividing the lattice between CPUs and GPUs) is supported by OpenLB but load balancing in this context is a work in progress (I actually talked about this last week at the DSFD conference).
I can aid you in getting the heterogeneous setup running but whether this is an advantage for you heavily depends on the specific application. I would recommend to focus on multi GPU only execution for now. (With a problem size orders of magnitude smaller for local workstation usage).