Abstract: The Sunway TaihuLight supercomputer based on the Chinese-designed many-core processors is the world’s fastest system with a peak performance of 125.4 PFlops.OpenFOAM (open source field operation and manipulation) is one of the most popular open source computational fluid dynamics (CFD) software which is written in C++ and not fully compatible with compilers on the heterogeneous many-core processor SW26010.This paper ported OpenFOAM based on SW26010’s MPE(management processing element)/CPE (computing processing element) cluster architecture.To overcome the compilation incompatibility problem,we adopted the mixed-language application design.We also applied several SW26010’s feature-specific optimizations on the hotspot of OpenFOAM to deliver high performance,such as the register communication,vectorization,and double buffering.The experiments on SW26010 using real datasets show that the single-CG (core group) code runs 8.03x faster than the well-tuned version on the MPE,and the performance of single-CG is 1.18x higher than the serial implementation of Intel(R) Xeon(R) CPU E5-2695 v3.We also optimized the parallel implementation of OpenFOAM and yielded speedups of 184.9x on 256 CGs.The porting methods and optimizations presented can also be referenced for other complex C++ programs to achieve high performance on SW26010.

Key words: CFD,OpenFOAM,Heterogeneous many-core processor,Sunway supercomputer