By T.P. Jimmy To, Babak Hamidzadeh
Interactive Video-on-Demand structures: source administration andScheduling Strategies addresses matters in scheduling and administration of assets in an interactive continuous-media (e.g., audio and video) server. The publication emphasizes dynamic and run-time concepts for source scheduling and administration. Such concepts offer powerful instruments for aiding interactivity with online clients who require the approach to be responsive in serving their requests, and whose wishes and activities differ usually through the years.
With an emphasis on responsiveness and temporary functionality, this ebook elaborates on dynamic suggestions for handling and scheduling assets in Video-on-Demand/Multimedia platforms. in contrast to earlier books, this quantity offers an unparalleled exact research of the start-up and departure of streams. It offers a complete assessment of assorted options as workloads are diversified in a number of dimensions (including arrival price, facts cost and size of play).
Interactive Video-on-Demand structures: source administration andScheduling Strategies jointly addresses a number of matters together with QoS, throughput, responsiveness and potency. The recommendations mentioned during this quantity are relatively helpful to practitioners who're construction electronic library, interactive multimedia and hypermedia servers.
Interactive Video-on-Demand structures: source administration andScheduling Strategies is a superb reference for researchers, practitioners and educators within the box of multimedia structures, and should be used for complicated classes on multimedia structures and Video-on-Demand servers.
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Extra info for Interactive Video-On-Demand Systems: Resource Management and Scheduling Strategies
5 Effects of load on performance We believe that in supporting interactive VOD applications, the behavior of a scheduler under fluctuating loads can be as important as its steady-state capabilities. 5 seconds standard deviation. 16. 14 shows that GS_EDF obtains much improved real-time stream throughput over the round-robin approach, as arrival rate increases. As arrival rate decreases, the throughput of GS_EDF decreases due to insufficient loading. 15, is also reduced quickly to a very low value.
J ... ;· .. o . :q. ~ ; I ~ I I -if I I; . I ·· .. ; · .. 4. Buffer requirement Bi for stream i Service to stream i starts at time b and ends at time d. The length of this duration is the estimated service time Vi' To sustain consumption at a rate of ri for the overhead time TOB, i ' at time b the remaining data in the buffers must be at least r i . TOB, i' At time c, data from the disk starts to refill the buffers at a rate of 1IT'sec (shown by the rising segment of the dashed reference line).
Essentially the earliest deadline, as well as all the succeeding ones, are pushed away from the present by a large margin. GS_EDF always services the stream with the earliest deadline, be it playing or pending to start. It maintains the deadline of a newly admitted stream at a good distance from the current time. This ensures that the new stream will only be given initial service when the deadlines of all playing streams have been pushed further than its deadline. This happens when all playing streams have developed a safe level of data accumulation to tolerate round expansion.