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LDF-CLOCK: The least-dirty-first CLOCK replacement policy for PCM-based swap devices

Title
LDF-CLOCK: The least-dirty-first CLOCK replacement policy for PCM-based swap devices
Authors
Yoo S.Lee E.Bahn H.
Ewha Authors
반효경
SCOPUS Author ID
반효경scopus
Issue Date
2015
Journal Title
Journal of Semiconductor Technology and Science
ISSN
1598-1657JCR Link
Citation
vol. 15, no. 1, pp. 68 - 76
Keywords
CLOCKPhase-change memoryReplacement policySwap deviceVirtual memory
Publisher
Institute of Electronics Engineers of Korea
Indexed
SCIE; SCOPUS; KCI WOS scopus
Abstract
Phase-change memory (PCM) is a promising technology that is anticipated to be used in the memory hierarchy of future computer systems. However, its access time is relatively slower than DRAM and it has limited endurance cycle. Due to this reason, PCM is being considered as a high-speed storage medium (like swap device) or long-latency memory. In this paper, we adopt PCM as a virtual memory swap device and present a new page replacement policy that considers the characteristics of PCM. Specifically, we aim to reduce the write traffic to PCM by considering the dirtiness of pages when making a replacement decision. The proposed replacement policy tracks the dirtiness of a page at the granularity of a sub-page and replaces the least dirty page among pages not recently used. Experimental results with various workloads show that the proposed policy reduces the amount of data written to PCM by 22.9% on average and up to 73.7% compared to CLOCK. It also extends the lifespan of PCM by 49.0% and reduces the energy consumption of PCM by 3.0% on average. © 2015, Institute of Electronics Engineers of Korea. All rights reserved.
DOI
10.5573/JSTS.2015.15.1.068
Appears in Collections:
엘텍공과대학 > 컴퓨터공학과 > Journal papers
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