本文从 DSM结构和应用程序结合的角度出发 ,分析了制约系统性能发挥的两个主要因素 :静态结构因素与动态应用程序行为因素。本文首先将 L og P模型引入到DSM基本结构模型的建立中 ,在此基础上对并行程序在 DSM上的运行进行了定性的分析。分析发现 :静态因素中消息处理开销 ,o,是影响性能的关键 ,在应用程序不变的情况下 ,减小 o能绝对地提高系统性能 ;动态因素与应用程序的动态行为有关 ,并很大程度上影响系统性能的发挥 ,通过改善应用程序的动态行为可有效地提高系统性能 This paper analyzes the two main factors which restrict the performance of the system from the perspective of the DSM structure and application program: the static structure factor and the dynamic application behavior factor. In this paper, L og P model is first introduced into the establishment of DSM basic structure model, on the basis of which qualitative analysis of the parallel program running on the DSM is carried out. Analysis found that: static factors in the message processing overhead, o, is the key to affect performance, in the case of the same application, reducing the o can definitely improve system performance; dynamic factors and application dynamic behavior and large To a certain extent, it affects the performance of the system, which can effectively improve the system performance by improving the dynamic behavior of the application