Coordinated Control of Multiple Prefetchers in Multi-Core Systems

Provided by: Association for Computing Machinery
Topic: Hardware
Format: PDF
Aggressive prefetching is very beneficial for memory latency tolerance of many applications. However, it faces significant challenges in multi-core systems. Prefetchers of different cores on a Chip Multi-Processor (CMP) can cause significant interference with prefetch and demand accesses of other cores. Because existing prefetcher throttling techniques do not address this prefetcher-caused inter-core interference, aggressive prefetching in multi-core systems can lead to significant performance degradation and wasted bandwidth consumption. To make prefetching effective in CMPs, this paper proposes a low-cost mechanism to control prefetcher-caused inter-core interference by dynamically adjusting the aggressiveness of multiple cores' prefetchers in a coordinated fashion.

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