基于主动负载分担的P2P流媒体系统数据调度算法  

A data scheduling algorithm based on active load sharing in P2P media streaming system

作　　者：温琼翡[1,2] 朱艳琴[1,2] 纪其进[1,2] 

机构地区：[1]苏州大学计算机科学与技术学院,江苏苏州215006 [2]苏州大学江苏省计算机信息处理技术重点实验室,江苏苏州215006

出　　处：《江苏科技大学学报（自然科学版）》2012年第2期181-184,共4页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金资助项目(61070170);苏州市融合通信重点实验室建设项目(SZS0805);苏州市应用基础研究计划项目(SYJG09024)

摘　　要：在P2P流媒体系统中,由于节点缺乏系统的全局视图,在调度数据请求时难以做到负载平衡,因而可能存在大量的轻载节点.为了提高这些轻载节点的带宽利用率,将节点的负载情况分等级并让轻载节点主动向重载节点通告负载等级,通过允许重载节点将某些数据请求转移给轻载节点实现负载分担.仿真实验结果表明,相比于现有的数据调度算法,文中所提算法提高了系统资源利用率和平均播放质量,可以有效地改善了系统的整体性能.In a P2P media streaming system,nodes are lack of the global view of the whole system.Therefore,it is hard to reach load balancing while scheduling data requests and there might be many nodes idle most of the time.So it is important to improve the bandwidth utilization of these nodes.In this paper,load of nodes are graded into three levels,and nodes at low level actively brodcast its load level to other nodes.Loads at high-level nodes are shared by low level nodes via data request migration.The simulation result shows that our algorithm can improve the system performance with higher average quality of media playback and efficiency of upload bandwidth utilization.

关 键 词：P2P流媒体系统 数据调度 主动分担 任务迁移 

分 类 号：TP301[自动化与计算机技术—计算机系统结构]