NDLI: Cooperative Caching for Chip Multiprocessors

Content Provider	IEEE Xplore Digital Library
Author	Jichuan Chang Sohi, G.S.
Copyright Year	2006
Description	Author affiliation: Dept. of Comput. Sci., Wisconsin Univ., Madison, WI (Jichuan Chang; Sohi, G.S.)
Abstract	This paper presents CMP cooperative caching, a unified framework to manage a CMP's aggregate on-chip cache resources. Cooperative caching combines the strengths of private and shared cache organizations by forming an aggregate "shared" cache through cooperation among private caches. Locally active data are attracted to the private caches by their accessing processors to reduce remote on-chip references, while globally active data are cooperatively identified and kept in the aggregate cache to reduce off-chip accesses. Examples of cooperation include cache-to-cache transfers of clean data, replication-aware data replacement, and global replacement of inactive data. These policies can be implemented by modifying an existing cache replacement policy and cache coherence protocol, or by the new implementation of a directory-based protocol presented in this paper. Our evaluation using full-system simulation shows that cooperative caching achieves an off-chip miss rate similar to that of a shared cache, and a local cache hit rate similar to that of using private caches. Cooperative caching performs robustly over a range of system/cache sizes and memory latencies. For an 8-core CMP with 1MB L2 cache per core, the best cooperative caching scheme improves the performance of multithreaded commercial workloads by 5-11% compared with a shared cache and 4-38% compared with private caches. For a 4-core CMP running multiprogrammed SPEC2000 workloads, cooperative caching is on average 11% and 6% faster than shared and private cache organizations, respectively
Starting Page	264
Ending Page	276
File Size	352976
Page Count	13
File Format	PDF
ISBN	076952608X
ISSN	10636897
DOI	10.1109/ISCA.2006.17
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-06-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Cooperative caching Aggregates Wire Access protocols Proposals Resource management Robustness Costs Added delay
Content Type	Text
Resource Type	Article

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