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多媒体服务器混合磁盘调度策略
引用本文:徐婕,庞丽萍,涂碧波.多媒体服务器混合磁盘调度策略[J].小型微型计算机系统,2003,24(10):1829-1832.
作者姓名:徐婕  庞丽萍  涂碧波
作者单位:华中科技大学,计算机科学与技术学院,湖北,武汉,430074
基金项目:国家“8 63”项目资助 (2 0 0 2 AA1Z2 10 2 )
摘    要:基于多媒体服务器的性能要求,提出了一种自适应的混合磁盘调度策略DRT-window.它既能满足实时请求对实时性的要求,根据实时请求的截止期动态选择窗口大小;又能在其松弛度内尽努力(best-effort)地服务非实时请求,从而减少非实时请求的响应时间。DRT-window采用了两级层次调度方案:第一层为不同类型的请求采用各自适合的调度策略;第二层为混合请求调度嚣,混合调度第一层中的不同类型的请求。通过性能比较和理论证明,表明此混合磁盘调度策略能在保证实时请求无抖动执行的同时,尽量地减少非实时请求的响应时间。

关 键 词:多媒体服务器  磁盘调度  混合媒体  DRT-window  EDF  LLF
文章编号:1000-1220(2003)10-1829-04

Disk Scheduling Algorithms for Mixed Media Workload Based on Multimedia Server
XU Jie,PANG Li-ping,TU Bi-bo.Disk Scheduling Algorithms for Mixed Media Workload Based on Multimedia Server[J].Mini-micro Systems,2003,24(10):1829-1832.
Authors:XU Jie  PANG Li-ping  TU Bi-bo
Abstract:In this paper we propose a novel disk scheduling algorithms for mixed media workload based on multimedia server(DRT-window). It gives priority to best-effort disk requests while meeting real-time request deadlines. DRT-window employs a two-level disk scheduling architecture: different types of requests select appropriate algorithms for themselves in the first level; our novel disk scheduling algorithms for mixed media(DRT-window) is in the second level. It turn out DRT-window can reduce the mean response time of best-effort requests while guaranteeing the execute of real-time requests with little jitter by performance comparing and theoretical proving.
Keywords:multimedia server  disk scheduling algorithms  DRT-window  EDF  LLF
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