Real-time and real-space program tuned in K-computer

26th IUPAP Conference on Computational Physics

物理学;计算机科学

Zempo, Y.^1 ; Akino, N.^2 ; Ishida, M.^2 ; Tomiyama, E.^3 ; Yamamoto, H.^3

Computer and Information Sciences, Hosei University, 3-7-2 Kajino, Koganei

184-8584, Japan^1

Sumitomo Chemical, Co., Ltd., 6 Kitahara, Tsukuba

300-3264, Japan^2

Research Organization for Information Science and Technology, 1-5-2 Minatojima-Minami, Chuo, Kobe

650-0047, Japan^3

关键词: Earth simulators;    MPI communications;    Parallelization efficiency;    Parallelizations;    Real time;    Real-space;    Total performance;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/640/1/012066/pdf
DOI  :  10.1088/1742-6596/640/1/012066

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

We have transported the code from Earth Simulator (ES) to K-Computer (KC) keeping a scalability. The base code achieved remarkable linear scalability and significant parallelization efficiency in EC before. The reason of success is that, taking into account the architectural differences between ES and KC, we improve the program step by step. Actually, the program showed a 37% improvement in the total performance with the implementations such as hybrid OpenMP and MPI parallelization, and the optimal rank mapping, and the MPI communication concealment, including removing the unnecessary processes such as zero clear and data copy.