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Discuss what techniques could

[问答题]

Discuss what techniques could be used to meet quality of service requirements for multimedia applications in the following components

of a system:

·Process scheduler

·Disk scheduler

·Memory manager

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Answer:The process scheduler can use the rate monotonic scheduling algorithm to guarantee that the processor is utilized for meeting the quality of service requirements in a timely manner.In this scheme,processes are modeled to be periodic and require a fixed processing

time every time they are scheduled.The disk scheduler needs to schedule requests in a timely manner and also minimize the movement of the disk head in order to minimize disk seek overheads.One option is to use a technique that combines the disk SCAN technique with the earliest-deadline-first strategy.Tasks are processed in the order of deadlines.When a batch of requests have the same or related deadlines,then the SCAN technique is used to satisfy the batch of requests.The memory management needs to ensure that unexpected page faults do not occur during playback of media files.This can be guaranteed if the required pages are swapped into physical memory before the multimedia application is scheduled.


发表于 2018-05-05 21:02:03 回复(0)