Distance-aware L2 cache organizations for scalable multiprocessor systems

  • Authors:
  • Sung Woo Chung;Hyong-Shik Kim;Chu Shik Jhon

  • Affiliations:
  • Processor Architecture Lab., SOC R&D Center, Samsung Electronics Co., Yongin, Gyeonggi-Do 449-711, South Korea;Department of Computer Science and Engineering, Chungnam National University, Daejeon 305-764, South Korea;School of Computer Science and Engineering, Seoul National University, Seoul 151-742, South Korea

  • Venue:
  • Journal of Systems Architecture: the EUROMICRO Journal - Special issue: Reconfigurable embedded systems: Synthesis, design and application
  • Year:
  • 2005

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Abstract

In order to provide the scalability to the multiprocessor systems, it is important to keep the remote memory access time in bounds so that it does not impose much additional overhead as the system grows.In this paper, we suggest an LRU/distance-aware combined second-level(L2) cache for scalable CC-NUMA multiprocessors, which is composed of a traditional LRU cache and an additional distance-aware cache that maintains the distance information of individual cache block for replacement purposes. The LRU cache selects a victim using age information as it typically does, while the distance-aware cache does using distance information. Both work together to reduce effectively the overall distance the cache miss goes through by keeping long-distance blocks as well as recently used blocks. It has been observed that the proposed cache outperforms the traditional LRU cache by up to 28% in the execution time. It is also found to perform even better than an LRU cache of twice the size.