用于DSM的组一致性模型  

GROUP CONSISTENCY MODEL IN DISTRIBUTED SHARED MEMORY SYSTEMS

作　　者：李群[1] 谢立[1] 孙钟秀[1] 

机构地区：[1]南京大学计算机科学与技术系,南京210093

出　　处：《计算机学报》1998年第S1期247-251,共5页Chinese Journal of Computers

基　　金：国家攀登计划;863高科技基金

摘　　要：本文针对大规模网络计算环境的特点，提出了基于组结构的组一致性模型，它在组内和组间可采用不同的一致性模型，为在大规模系统中采用更为灵活、易于管理、适于应用、性能提高的DSM模式提供了支持．本文讨论了在组间采用入口一致性，在组内采用惰性释放一致性的组一致性的程序模型以及其实现策略．这种组一致性在组内采用写更新以及多写协议以利于组内节点的并行读写，消除了假共享，减小了数据获得的时间．组间一致性也有利于体现组间数据共享的特点，并可将组内对数据的更新一并传送，减小了网络开销．The traditional consistency models for system performance optimization, such as weakconsistency, release consistency and entry consistency, cannot suit to the large scale system becausethey haven't described the differences for data sharing among various parts of a system. Accordingto the characteristics of large scale network computing systems, we propose a group consistencymodel based on the concept of group. The novel model can use different inter--group and intra-groupconsistencies and lend itself to flexible, easily-manageable, and application-suitable DSM in largescale systems. A group consistency model, which applies entry consistency among groups and lazyrelease consistency in a group, and its implementation policy are discussed in this paper. It employswrite-update and multi-write protocols in a group, and thus facilitates the simultaneous read andwrite in a group. The suitable protocols eliminate the false sharing and reduce the data acquiringtime in a group. Furthermore, the inter-group consistency also suits the features of data sharingamong groups and transmits the data updates originated from a group in bulk to reduce the networktraffic. In the end, an example using group consistency model is given and the trivial groupconsistency is discussed.

关 键 词：分布式共享存储器 存储一致性 释放一致性 入口一致性 

分 类 号：TP333[自动化与计算机技术—计算机系统结构]