基于实时多媒体流的预取算法研究  

Research of Prefetch Algorithm Based on Real-time Multimedia Streams

作　　者：阮俊波[1] 金惠华[1] 

机构地区：[1]北京航空航天大学计算机学院,北京100083

出　　处：《计算机工程与应用》2004年第2期93-94,98,共3页Computer Engineering and Applications

摘　　要：实时多媒体应用存在严格的时间限制。存储访问时延是影响系统性能的一个最关键问题,针对实时多媒体数据而言,基于传统数据的LRU及其改进算法上的的预取和置换策略已经不能满足实际QoS要求。该文针对实时多媒体流,建立终端环境下的实时媒体对象的任务路径树模型,并给出该模型下的媒体流的预取和置换算法MO-VFT。实验模拟结果表明,所提出的模型合理,算法负载小,性能提高达20～35%。Real-time multimedia applications must meet with time constraint.Latency of memory access is the most crit-ical performance issue.For real-time multimedia data,prefetching and replacement policy based on LRU and its improve-ment for traditional datas do not guarantee the QoS.Based on real-time media stream under end system,it proposes task path tree model of real-time media objects,prefetching and replacement algorithm is given.Experiments show that the given model is practical,and work-loads of the algorithm is low,the technique could improve20～35%efficiency.

关 键 词：实时 预取 置换 QOS 媒体流 

分 类 号：TP37[自动化与计算机技术—计算机系统结构]