基于多任务下载的P2P-VoD系统的测量与分析  

Measurements and Analysis of Multi-Task P2P-VoD Systems

作　　者：刘春阳 张铁赢[2,3] 陈国耀 余智华 

机构地区：[1]国家计算机网络应急技术处理协调中心,北京100031 [2]中国科学院计算技术研究所,北京100190 [3]中国科学院网络数据科学与技术重点实验室,北京100190 [4]神华科学技术研究院,北京102211

出　　处：《计算机科学与探索》2014年第11期1304-1313,共10页Journal of Frontiers of Computer Science and Technology

基　　金：国家自然科学基金;国家自然科学基金重点项目;国家重点基础研究发展计划(973计划);国家242专项~~

摘　　要：近些年,P2P点播系统(P2P-Vo D)受到广泛关注,其大多研究工作基于理论性的传统假设,这些假设在真实的系统中是如何表现的不得而知。因此,在真实P2P-Vo D系统中对传统假设进行全面的测量和验证就显得十分迫切。对实际运行的P2P-Vo D系统Cool Fish进行了大量的测量与分析,发现了一些不同于以往假设的结果:节点加入不是简单地服从泊松分布;观看时间和影片流行度不呈严格的正相关性;跳转频率和影片流行度不呈负相关。最后对这些结果进行了深入的分析和讨论。P2P-VoD systems have gained tremendous popularity in recent years. Existing research is mostly based on the traditional theoretical assumptions. However, what is the performance of these assumptions is not known in the real world. It is particularly valuable to understand how the real-world system works. This paper presents a comprehensive measurement and analysis on CoolFish, a real deployed P2P-VoD system, and proposes some statistical models different from the traditional observations on user behavior：the access pattern does not match Poisson distri-bution;session time does not have positive correlation with movie popularity;jump frequency does not have a negative correlation with movie popularity as assumed in previous studies. This paper analyzes the reasons for these results.

关 键 词：peer-to—peer(P2P) 视频点播(VOD) 流媒体 P2P评价模型 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]