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Title:
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Adapting cache partitioning algorithms to pseudo-LRU replacement policies
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Author:
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Kedzierski, Kamil; Moreto Planas, Miquel; Cazorla, Francisco; Valero Cortés, Mateo
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Other authors:
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Universitat Politècnica de Catalunya. Departament d'Arquitectura de Computadors; Universitat Politècnica de Catalunya. CAP - Grup de Computació d'Altes Prestacions |
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Abstract:
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Recent studies have shown that cache partitioning is an efficient technique to improve throughput, fairness and Quality of Service (QoS) in CMP processors. The cache partitioning algorithms proposed so far assume Least Recently Used (LRU) as the underlying replacement policy. However, it has been shown that the true LRU imposes extraordinary complexity and area overheads when implemented on high associativity caches, such as last level caches. As a consequence, current processors available on the market use pseudo-LRU replacement policies, which provide similar behavior as LRU, while reducing the hardware complexity. Thus, the presented so far LRU-based cache partitioning solutions cannot be applied to real CMP architectures. This paper proposes a complete partitioning system for caches using the pseudo-LRU replacement policy. In particular, the paper focuses on the pseudo-LRU implementations proposed by Sun Microsystems and IBM, called Not Recently Used (NRU) and Binary Tree (BT), respectively. We propose a high accuracy profiling logic and a cache partitioning hardware for both schemes. We evaluate our proposals' hardware costs in terms of area and power, and compare them against the LRU partitioning algorithm. Overall, this paper presents two hardware techniques to adapt the existing cache partitioning algorithms to real replacement policies. The results show that our solutions impose negligible performance degradation with respect to the LRU. |
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Abstract:
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Peer Reviewed |
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Subject(s):
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-Àrees temàtiques de la UPC::Informàtica::Arquitectura de computadors
-Multiprocessors
-Cache memory
-Cache storage
-Multiprocessing systems
-Quality of service
-Multiprocessadors
-Memòria ràpida de treball (Informàtica) |
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Rights:
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Document type:
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Article - Published version
Conference Object |
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Published by:
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Institute of Electrical and Electronics Engineers (IEEE)
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