对分布式共享存储中的伪共享的动态控制  

DYNAMICALLY CONTROLLING FALSE SHARING IN A DISTRIBUTED SHARED MEMORY

作　　者：章锋[1,2,3] 徐大杰 李宇峰[1,2,3] 陈国良[1,2,3] 

机构地区：[1]中国科学技术大学计算机科学系 [2]蚌埠坦克学院射击教研室 [3]解放军第一军事医学大学通讯站

出　　处：《计算机研究与发展》1999年第3期291-296,共6页Journal of Computer Research and Development

基　　金：国家自然科学基金;"八六三"高技术计划

摘　　要：分布式共享存储（ＤＳＭ）使得在分布式存储机器上，对显式消息传递编程的需要得到减轻．为降低存储访问延迟，ＤＳＭ系统将数据复制多个拷贝．文中考查了几种用于控制因伪共享问题造成的存储抖动的方法，提出了一种新的存储一致性协议：写者拥有协议，它在运行时检测并消除伪共享．迭代运算中，由于数据在每次迭代中被相似地存取，写者拥有协议只要消除一次伪共享，所以额外开销非常小．实验数据表明，写者拥有协议通常情况下优于已有的协议．Distributed shared memory (DSM) alleviates the need to program message passing explicitly on a distributed memory machine. In order to reduce memory latency, DSM replicates copies of data. Here examined are some current approaches to controlling thrashing caused by false sharing in a DSM. A novel memory consistency protocol (writer owned protocol) is introduced, which detects and eliminates false sharing at run time. In iterative computations where the data is accessed similarly at every iteration, the writer owned protocol can have tremendous benefits because the overhead of eliminating false sharing is incurred only once. Performance results show that the writer owned protocol is often better than the existing approaches.

关 键 词：分布式共享存储 伪共享 DSM系统 存储系统 

分 类 号：TP333[自动化与计算机技术—计算机系统结构]