分布式共享存储虽然有易于编程的优点 ,但往往被认为效率不高 .完全由软件实现的分布式共享存储系统 (又称为虚拟共享存储系统 )更是如此 .文中以典型的消息传递系统 PVM与分布式共享存储系统 JIAJIA为例 ,分析了这两种并行程序设计环境的特点 ,并用 7个应用程序在曙光 10 0 0 A上分别比较了这两个系统的性能 .实验结果表明 ,JIAJIA的性能与 PVM基本相当 ,但基于 JIAJIA的并行程序设计却比 PVM简单得多 Although distributed shared storage has the advantage of easy programming, it is often regarded as inefficient.Furthermore, the distributed shared storage system (also known as virtual shared storage system) And JIAJIA, a distributed shared storage system, the characteristics of these two kinds of parallel programming environments are analyzed and the performance of these two systems is compared respectively with 7 applications at Dawn 100 0 A. The experimental results show that JIAJIA Performance and PVM basically the same, but based on JIAJIA parallel programming is much simpler than PVM