4 ms·
Nice, interesting solver! But yes, compressible/density-based solvers work a lot better on GPUs than incompressible/pressure-based solvers. When 80% of the runt
by semi-extrinsic 2y ago
Nice, interesting solver! But yes, compressible/density-based solvers work a lot better on GPUs than incompressible/pressure-based solvers. When 80% of the runtime is spent solving a Poisson equation, GPU is not worth it.
Especially if you do the comparison on equivalent cost basis, i.e. "what is the walltime difference if I run on a $60k all-CPU cluster versus a $60k GPU cluster". Or in terms of cloud compute cost / HPC allocation spend.
- markstock 2y agoThis has not been my experience in the academic/research side. Poison solver-based incompressible CFD regularly runs ~10x faster on equivalently-priced GPU systems, and has been doing so since I've been following it (since 2008). Some FFT-based solvers don't weak scale ideally, but that'd be even worse for CPU-based versions, as they use similar algorithms and would be spread over many more nodes.