基于服务质量需求的存储系统动态优先权调度策略  

Quality of Service Aware Dynamic Priority Scheduling Scheme for the Mixed Class Multimedia Workloads in the Storage Systems

作　　者：李中[1] 王刚[2] 刘璟[2] 

机构地区：[1]天津航海仪器研究所,天津300131 [2]南开大学信息技术科学学院,天津300071

出　　处：《计算机研究与发展》2006年第11期2027-2032,共6页Journal of Computer Research and Development

基　　金：国家自然科学基金项目(60273031);高等学校博士点专项科研基金项目(20020055021);天津市科技发展计划重点基金项目(043800311)

摘　　要：多媒体应用要求存储系统提供保证服务质量的数据访问服务,响应时间超过延迟上限的访问请求必须小于一定的比例.基于服务质量需求的动态优先权调度策略(QADPS)根据多媒体应用接受存储系统服务的历史信息,计算多媒体应用的服务质量失败距离;并为失败距离较小的多媒体应用分配较高的调度优先权.QADPS根据多媒体应用的不同服务质量需求,实现了有差别的调度:多媒体应用的服务质量需求越严格,它的访问请求被调度的机会越高.QADPS能够在保证服务质量的前提下,支持更多的并发多媒体应用.QADPS （QoS-aware dynamic priority scheduling scheme）, a new scheduling scheme for meeting the different QoS requirements of multimedia applications is introduced in this paper. When retrieving data from the storage systems, multimedia applications need the guarantee of QoS. The fraction of requests whose response time exceeds a specific delay limit must be below a certain proportion. Different muhimedia applications may have different QoS requirements in the mixed multimedia workloads. Based on the history of a muhimedia application receiving service, its QoS failed-distance can be calculated. The basic idea of QADPS is to assign higher priority to the multimedia applications that have shorter failed distance. Using this scheme, the requests of the multimedia applications with stricter QoS requirements can achieve more chances of service applied by the storage systems. The effectiveness of this approach is evaluated through simulation. Compared with the conventional scheme, QADPS substantially increases the number of the concurrent multimedia applications.

关 键 词：存储系统 多媒体应用 服务质量 动态优先权 调度策略 

分 类 号：TP333[自动化与计算机技术—计算机系统结构]