一种光盘库的短节目调度算法
A Scheduling Algorithm of Short Video Clips in a Jukebox
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摘要: 海量的视频资料可以直接存储在光盘库 (或磁带库 )等大容量存储设备中 为了提高系统的性能 ,必须研究有效的调度策略 提出了一种基于光盘库的短节目视频点播系统调度算法———CMF(combinedMQL/FCFS)算法 该算法依据等待请求队列的权重来选择所需服务的盘片 ,并根据节目请求到达率的不同来调整等待队列中请求的等待时间权重 ,使系统获得效率和公平之间的平衡 仿真结果表明 ,与MQL和FCFS算法相比 ,该算法有效减少了用户请求的撤消率 ,提高了系统的吞吐量Abstract: Massive amount of video clips can be stored in a jukebox in VOD systems and thus effective scheduling algorithms are needed. In this paper a scheduling algorithm, called combined MQL/FCFS (CMF), of short video clips in the jukebox is proposed. The proposed algorithm first serves the disc with the highest weight of its waiting queue, and the weight of a queue is defined as the pending request’s waiting time weighted by workload to balance the efficiency and fairness. Simulation shows that the proposed algorithm reduces the defection probability and increases the throughput significantly compared with MQL and FCFS algorithms.
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