&lt;title&gt;Real-time scheduling for multimedia services&lt;/title&gt;

Little, Thomas D. C.; Gibbon, John F.

doi:10.1117/12.141086

Cited by 5 publications

(2 citation statements)

References 8 publications

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“…Four kinds of resources, namely the disk(s), memory buffers, processor time and network bandwidth, are all involved in VOD data retrievals. These resources need to be collectively scheduled in order to provide timely retrieval of video data [1,2,3].…”

Section: Introductionmentioning

confidence: 99%

<title>Using run-time information for performance optimization in an interactive VOD server</title>

Hamidzadeh

1997

SPIE Proceedings

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Disruptions and delays in the retrieval of continuous motion video data streams from storage devices are unacceptable for Video-On-Demand (VOD) service. Concurrent VOD services require careful scheduling of accesses to the storage device in real-time. In this paper, we propose a dynamic approach to schedule the retrieval of motion video data in interactive VOD servers. Most of the previous VOD scheduling approaches use fixed disk read sizes and pre-determined reading orders. Run-time information is seldom used to filly exploit the potential capacity of the system. To maximize throughput, our approach relaxes admission control by observing run-time information. To improve performance under heavy transients, we introduce mechanisms to dynamically control the read sizes of disk accesses, to pipeline admission of new streams with departure of ongoing streams, and to safely deviate from seekreducing service sequence to provide early initial service. Most important of all, our scheduler is designed to reduce start-up delay significantly. When the demand on real-time services decreases, our scheduler is also highly efficient in redirecting disk bandwidth to service sporadic requests. We evaluate our technique by comparing its perfonnance with two static seek-reducing techniques via thorough experiments under different buffer capacities and load settings. Results of experiments show our technique's significant improvements in real-time service throughput, initial response time, and sporadic service throughput.

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Section: Introductionmentioning

confidence: 99%

<title>Using run-time information for performance optimization in an interactive VOD server</title>

Hamidzadeh

1997

SPIE Proceedings

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“…The essence of the LAP scheduling is as follows [13]. A multimedia session is decomposed into periods of similar resource utilization that can be scheduled independently ( Figure 6).…”

Section: Limited a Priori Schedulermentioning

confidence: 99%

Real-time data delivery for multimedia networks

Gibbon

Little²

1993 18th Conference on Local Computer Networks

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Abstract-A coherent computer-based multimedia presentation requires the use of real-time scheduling theory applied to system resources including storage devices, the bus, and network. In this paper we present a scheduling technique which is essentially static in nature during periods of network quiescence, but becomes dynamic in response to detection of network load changes or user interaction.This mechanism, called the limited a priori (LAP) scheduler, is an extension of earlier work on scheduling which assumed guaranteed system loading characteristics. The LAP scheduler determines network load changes and estimates packet delay using a dynamic filtering algorithm. We show the bounds of accuracy for this technique and describe its suitability with respect to multimedia traffic across an FDDI network.

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Hamidzadeh

2001

Multimedia Tools and Applications

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<title>Real-time scheduling for multimedia services</title>

Cited by 5 publications

References 8 publications

<title>Using run-time information for performance optimization in an interactive VOD server</title>

<title>Using run-time information for performance optimization in an interactive VOD server</title>

Real-time data delivery for multimedia networks

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