【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器 ,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更多还原

【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.更多还原