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SAC:Exploiting Stable Set Model to Enhance cacheFiles

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维普期刊数据库

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Journal of Computer Science & Technology 2014年第2期29卷 293-302页

作者：刘建亮张永乐杨琳郭明阳刘振军许鲁 Data Storage and management Technology Research Center Institute of Computing TechnologyChinese Academy of Sciences University of Chinese Academy of Sciences Department of Electrical and Computer Engineering University of Toronto

Client cache is an important technology for the optimization of distributed and centralized storage systems. As a representative client cache system, the performance of cacheFiles is limited by transition faults. Furthermore, cacheFiles just supports a simple LRU policy with a tightly-coupled design. To overcome these limitations, we propose to employ Stable Set Model （SSM） to improve cacheFiles and design an enhanced cacheFiles, SAC. SSM assumes that data access can be decomposed to access on some stable sets, in which elements are always repeatedly accessed or not accessed together. Using SSM methods can improve the cache management and reduce the effect of transition faults. We also adopt loosely- coupled methods to design prefetch and replacement policies. We implement our scheme on Linux 2.6.32 and measure the execution time of the scheme with various file I/O benchmarks. Experiments show that SAC can significantly improve I/O performance and reduce execution time up to 84%0, compared with the existing cacheFiles.

关键词： Stable Set Model cache management cacheFiles

A DTN Oriented Adaptive Routing Algorithm Based on Node Load

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China Communications 2022年第12期19卷 54-63页

作者： Hongyan Cui Diyue Chen Roy E.Welsch State Key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China Beijing Laboratory of Advanced Information Networks Beijing University of Posts and TelecommunicationsBeijing 100876China Massachusetts Institute of Technology CambridgeMA 02139USA

In recent years,Delay Tolerant Networks(DTN)have received more and more *** the same time,several existing DTN routing algorithms generally have disadvantages such as poor scalability and inability to perceive changes in the network *** paper proposes an AdaptiveSpray routing *** algorithm can dynamically control the initial maximum message copy number according to the cache occupancy rate of the node itself,and the cache occupancy rate is added as an impact factor to the calculation of the probability of each node meeting the destination *** the forwarding phase,the node will first compare the meeting probability of itself and the meeting node to the destination node,and then choose different forwarding *** simulation shows that the AdaptiveSpray algorithm proposed in this paper has obvious advantages compared with the existing routing algorithms in terms of message delivery rate and average delay.

关键词： DTN routing algorithm adaptive cache management

A reliable and energy-efficient storage system with erasure coding cache

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Frontiers of Information Technology & Electronic Engineering 2017年第9期18卷 1370-1384页

作者： Ji-guang WAN Da-ping LI Xiao-yang QU Chao Y-IN Jun WANG Chang-sheng XIE Wuhan National Laboratory for Optoelectronics Department of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

In modern energy-saving replication storage systems, a primary group of disks is always powered up to serve incoming requests while other disks are often spun down to save energy during slack periods. However, since new writes cannot be immediately synchronized into all disks, system reliability is degraded. In this paper, we develop a high-reliability and energy-efficient replication storage system, named RERAID, based on RAID10. RERAID employs part of the free space in the primary disk group and uses erasure coding to construct a code cache at the front end to absorb new writes. Since code cache supports failure recovery of two or more disks by using erasure coding, RERAID guarantees a reliability comparable with that of the RAID10 storage system. In addition, we develop an algorithm, called erasure coding write （ECW）, to buffer many small random writes into a few large writes, which are then written to the code cache in a parallel fashion sequentially to improve the write performance. Experimental results show that RERAID significantly improves write performance and saves more energy than existing solutions.

关键词： Reliability Energy-efficient Storage system Erasure coding cache management

Efficient cache replacement framework based on access hotness for spacecraft processors

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中国空间科学技术（中英文） 2024年第2期44卷 74-88页

作者： GAO Xin NIAN Jiawei LIU Hongjin YANG Mengfei Beijing Institute of Control Engineering Beijing 100190China Beijing SunWise Space Technology Co. Ltd.Beijing 100190China School of Computer Science and Technology Xidian UniversityXi'an 710071China China Academy of Space Technology Beijing 100094China

A notable portion of cachelines in real-world workloads exhibits inner non-uniform access ***,modern cache management rarely considers this fine-grained feature,which impacts the effective cache capacity of contemporary high-performance spacecraft *** harness these non-uniform access behaviors,an efficient cache replacement framework featuring an auxiliary cache specifically designed to retain evicted hot data was *** framework reconstructs the cache replacement policy,facilitating data migration between the main cache and the auxiliary *** traditional cacheline-granularity policies,the approach excels at identifying and evicting infrequently used data,thereby optimizing cache *** evaluation shows impressive performance improvement,especially on workloads with irregular access *** from fine granularity,the proposal achieves superior storage efficiency compared with commonly used cache management schemes,providing a potential optimization opportunity for modern resource-constrained processors,such as spacecraft ***,the framework complements existing modern cache replacement policies and can be seamlessly integrated with minimal modifications,enhancing their overall efficacy.

关键词： spacecraft processors cache management replacement policy storage efficiency memory hierarchy microarchitecture