| 一种有资源适应性的transcoding代理缓存机制 |
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| 引用本文： | 李春洪,冯国富,李文中,顾铁成,陆桑璐,陈道蓄.一种有资源适应性的transcoding代理缓存机制[J].电子学报,2006,34(8):1526-1529. |
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| 作者姓名： | 李春洪 冯国富 李文中 顾铁成 陆桑璐 陈道蓄 |
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| 作者单位： | 南京大学计算机软件新技术国家重点实验室,江苏南京 210093 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家自然科学基金，国家高技术研究发展计划(863计划) |
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| 摘 要： | 在基于transcoding代理的流媒体服务系统中,CPU和网络是两种潜在的瓶颈资源.本文提出了一种有资源适应性的transcoding代理缓存机制,统一考虑CPU和网络的资源需求,以提高系统的服务能力.首先推导了多版本缓存策略下网络收益和CPU收益的计算方法.通过引入一个时变的影响因子 α (t),给出了缓存系统聚合资源收益的表达.在此基础上给出了单个对象的缓存价值函数,并设计了RAC替换算法.实验表明RAC具有较好的资源适应性和系统吞吐率.
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| 关 键 词： | 编码转换 代理缓存 缓存替换算法 价值函数 |
| 文章编号： | 0372-2112（2006）08-1526-04 |
| 收稿时间： | 2005-08-02 |
| 修稿时间： | 2005-08-022006-05-02 |
A Resource-Adaptive Transcoding Proxy Caching Mechanism |
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| LI Chun-hong,FENG Guo-fu,LI Wen-zhong,GU Tie-cheng,LU Sang-lu,CHEN Dao-xu.A Resource-Adaptive Transcoding Proxy Caching Mechanism[J].Acta Electronica Sinica,2006,34(8):1526-1529. |
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| Authors: | LI Chun-hong FENG Guo-fu LI Wen-zhong GU Tie-cheng LU Sang-lu CHEN Dao-xu |
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| Affiliation: | State Key Laboratory for Novel Software Technology,Nanjing University,Nanjing,Jiangsu 210093,China |
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| Abstract: | In the transcoding proxy based streaming media systems,CPU and network are potential bottleneck resources.In this paper,a resource-adaptive transcoding proxy caching mechanism is proposed,which deals with network and CPU demand in an integrated fashion and aims to improve the system's capability potentially.We first explore the network gain and CPU gain of caching multiple versions at the same time.By introducing a time-vary influence factor α (t),the aggregated resource gain of the caching system is derived.Then,we derive the merit function of caching a single object under a given caching status,and design the RAC cache replacement algorithm.The experimental result shows that RAC can achieve good resource-awareness and improved system throughput. |
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| Keywords: | transcoding proxy caching cache replacement algorithm merit function |
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