关键词: 粒子输运, 异构协同计算, 蒙特卡罗方法, OpenMP, 国产加速器

Abstract: Particle transport simulation plays an important role in the field of nuclear science and medical radiation therapy. Based on Monte Carlo method, this paper proposes a heterogeneous cooperative algorithm of particle transport on the Tianhe2A system. Based on the asynchronous communication modes (BCL and ACL) of the Tianhe 2A system, a simple and efficient symmetric communication mode between the CPU and the Matrix2000 accelerator is proposed. On the Matrix2000 accelerator, the threadlevel parallelism of the program is developed through OpenMP instructions. The original serial data collection communication mode is optimized, and a new communication mode based on binary tree structure is proposed, which greatly reduces the communication time. On the Tianhe2A system, the parallel program based on CPU/Matrix2000 heterogeneous collaborative computing can be scaled up to 450k cores, and the parallel efficiency compared to 50k cores is stabilized at 22.54%.

Key words: particle transport, heterogeneous collaborative computing, Monte Carlo method, OpenMP, domestic accelerator