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电子学报  2015 

最小化出口流量花费的接入级P2P缓存容量设计方法

DOI: 10.3969/j.issn.0372-2112.2015.05.007, PP. 879-887

Keywords: P2P缓存技术,ISP网络,缓存部署,容量设计

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Abstract:

接入级P2P(Peer-to-Peer)缓存容量设计回答在接入级ISP(InternetServiceProvider)出口部署多大容量缓存的问题,目前还没有最优P2P缓存容量设计方法被提出.本文提出一种权衡存储成本和带宽成本的P2P缓存容量设计方法,以最小化ISP出口流量总花费为目标,将最优缓存容量设计问题描述为整数规划问题,其目标函数形式为单调阶梯函数,通过理论推导得出最优缓存容量计算公式指导接入级ISP进行缓存容量设计.将本文所提方法与Median和“20-80Rule”等几种ISP常用的容量设计方法进行性能比较,结果表明,本文所提方法明显优于已有方法,与目前ISP最认可的“20-80Rule”相比,应用本文所提方法的ISP出口流量总花费最多可降低7.5%.

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