By John G. Webster (Editor)

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The design of EVEREST suffers from the following limitation: the overhead of its preventive operations may become significant if many objects are swapped in and out of the disk drive. This happens when the working set of an application cannot become resident on the disk drive. In a real implementation of EVEREST, it might not be possible to fix the number of disk pages as an exact power of Ͷ. The most important implication of an arbitrary number of pages is that some sections may not have the correct number of buddies (Ͷ Ϫ 1 of them).

Human perception) to distinguish between two objects). ) This flexibility is identified; however, we do not use it in our formal definitions. It is part of our future research. , to what degree that display order of the objects is important to the user). • Presentation flexibility which refers to the degree of flexibility in the presentation length and presentation startup latency. 746 DISTRIBUTED MULTIMEDIA SYSTEMS Profile aware retrieval optimizer (Prime) accepts the Query-Script, which contains the user retrieval requirements and flexibilities (ordering, delay, display-quality, and presentation) as a formal definition, and then generates a retrieval plan that is optimal for the current CM-Server load.

This explains why with knob ϭ C/Avg_Slice1, PIRATE improves the variance proportional to the degradation in average latency. STREAM SCHEDULING AND SYNCHRONIZATION In this section, we investigate a taxonomy of scheduling problems corresponding to three classes of multimedia applications. The application classes and the corresponding scheduling problems include 1. On-demand atomic object retrieval: With this class of applications, a system strives to display an object (audio 740 DISTRIBUTED MULTIMEDIA SYSTEMS or video) as soon as a user request arrives referencing the object.

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37.Multimedia by John G. Webster (Editor)
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