Exploit temporal locality of shared data in SRC enabled CMP
NPC'07 Proceedings of the 2007 IFIP international conference on Network and parallel computing
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How to improve the scalability of snooping protocol and reduce the memory access latency of directorybased protocol are critical problems for performance optimization of multiprocessor systems. In this paper, we present an SRC (Sharing Relation Cache)-based protocol for chip multiprocessor architecture, in which protocol SRC is used to cache recently appeared sharing relations in case reuse in the near future. A two-phase write scheme is introduced to allow SRCbased protocol applicable not only in in-order network but also out-order network topology. By making full use of the temporal locality of sharing relations among processors, SRC-based protocol can heavily reduce the message traffic in CMP cache coherence protocols compared with snooping protocol. At the same time, SRC-based protocol has better memory access latency than directory-based protocol.