显式差分程序的巨型机宏任务并行计算

The Macrotasking Parallel Computation of an Explicit Difference Code on Supercomputers

本文首先介绍了与多处理机多任务并行计算有关的概念以及反映加速比上界的Ａｍｄａｈｌ法则。然后，采用循环分裂的静态负载平衡方法，在国产巨型并行多处理机系统ＹＨ－２上对ＭａｃＣｏｒｍａｃｋ显式格式解轴对称横向喷流强干扰流场的程序进行了重构使之能同时在多个处理机上同步协同运行。得到ＹＨ－２四处理机系统的宏任务并行计算加速比为３．５４５，ＹＨ－２的总体运行速度为ＹＨ－１的１０．８倍。

The concepts associated with the multiprocessing andmultitasking parallel computation and Amdahl’s law which gives the upperbound of the speedup are introduced first in this paper.Then adoptingthe loop-decomposition technique ensuring load balance statically,the codebased on the MacCormack explicit scheme for the calculation of the axi-symmetric strong interaction flow with transverse injection is reconstructedon domestic parallel multiprocessing supercomputer YH-2 so as to be exe-cuted concurrently on multiprocessors.The running results show that thecode gets a speedup 3.545 on 4 processors and runs totally l0.8 times onYH-2 as fast as on YH-1.