Sailfish: A flexible multi-GPU implementation of the lattice Boltzmann method

Michal Januszewski, Marcin Kostur

Abstract:

We present Sailfish, an open source fluid simulation package implementing the
lattice Boltzmann method (LBM) on modern Graphics Processing Units (GPUs)
using CUDA/OpenCL. We take a novel approach to GPU code implementation
and use run-time code generation techniques and a high level programming language (Python) to achieve state of the art performance, while allowing easy
experimentation with different LBM models and tuning for various types of
hardware. We discuss the general design principles of the code, scaling to multiple GPUs in a distributed environment, as well as the GPU implementation
and optimization of many different LBM models, both single component (BGK,
MRT, ELBM) and multicomponent (Shan-Chen, free energy). The paper also
presents results of performance benchmarks spanning the last three NVIDIA
GPU generations (Tesla, Fermi, Kepler), which we hope will be useful for researchers working with this type of hardware and similar codes.
Keywords: lattice Boltzmann, LBM, computational fluid dynamics, graph