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《Journal of Software》 2010-07
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Graph-Based Optimal Cache Deployment Algorithm for Distributed Caching Systems

LI Wen-Zhong1,2,CHEN Dao-Xu1,2,LU Sang-Lu1,2 1(State Key Laboratory for Novel Software Technology,Nanjing University,Nanjing 210093,China) 2(Department of Computer Science and Technology,Nanjing University,Nanjing 210093,China)  
Data caching has emerged as an effective way to reduce network traffic,alleviate server load and accelerate information access.Deploying a group of distributed caching nodes to cooperate with each other in serving client requests will further improve the system performance.One of the important issues in distributed caching system is coordinating cache placement to achieve access cost minimization.In this paper,a theoretical model is introduced to analyze the access cost of placing a set of data objects in distributed caching systems.In this model,the cache placement problem is formulated as an optimization problem.A graph-based algorithm is proposed to solve the problem.The algorithm applies a modified Dijkstra's algorithm to look for the shortest path in the access cost graph,which corresponds to an optimal cache deployment for the system.The correctness of the graph-based algorithm is proved theoretically and its performance is evaluated by simulations.Experimental results show that the graph-based algorithm outperforms most existing distributed caching schemes.
【Fund】: 国家自然科学基金Nos.60803111 90718031 60721002;; 国家高技术研究发展计划(863)No.2006AA01Z199;; 国家重点基础研究发展计划(973)No.2009CB320705;; 江苏省自然科学基金No.BK2009100~~
【CateGory Index】: O157.5
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