多核处理器面向低功耗的共享Cache划分方案  

A Low-Power-Oriented Mechanism for Shared Cache Partitioning on CMPs

作　　者：熊伟[1] 殷建平[1] 所光[1] 赵志恒[1] 

机构地区：[1]国防科学技术大学计算机学院,湖南长沙410073

出　　处：《计算机工程与科学》2010年第10期26-29,79,共5页Computer Engineering & Science

基　　金：国家自然科学基金资助项目(60603015;60970034)

摘　　要：随着多核处理器的发展,片上Cache的容量随之增大,其功耗占整个芯片功耗的比率也越来越大。如何减少Cache的功耗,已成为当今Cache设计的一个热点。本文研究了面向低功耗的多核处理器共享Cache的划分技术(LP-CP)。文中提出了Cache划分框架,通过在处理器中加入失效率监控器来动态地收集程序的失效率,然后使用面向低功耗的共享Cache划分算法,计算性能损耗阈值范围内的共享Cache划分策略。我们在一个共享L2 Cache的双核处理器系统中,使用多道程序测试集测试了面向低功耗的Cache划分:在性能损耗阈值为1%和3%的情况中,系统的Cache关闭率分别达到了20.8%和36.9%。As the development of CMPs,the size of a onchip cache increases and it consumes more and more power of the whole system. How to reduce the power of cache has become a focus of many designers of modern caches. This paper investigates a lowpoweroriented runtime mechanism for shared cache partitioning. A shared cache partitioning framework is proposed,and it uses the Miss Rate Monitors to collect the miss rate information of the current applications at runtime. Then the miss rates are inputted to a lowpoweroriented cache partitioning model to get the partitioning solution within the performance degradation threshold （PDT）. Our evaluation,on top of a two core CMP processor with a shared L2 cache,with 21 multiprogram workloads,shows that when PDT is 1% and 3%,the rates of L2 cache shutdown will be up to nearly 20.8% and 36.9% respectively.

关 键 词：共享CACHE划分 多核处理器 LOW POWER 

分 类 号：TP302[自动化与计算机技术—计算机系统结构]