Server-based smoothing of variable bit-rate streams

Authors:
Stergios V. Anastasiadis;Kenneth C. Sevcik;Michael Stumm
Affiliations:
University of Toronto, Toronto, Canada;University of Toronto, Toronto, Canada;University of Toronto, Toronto, Canada
Venue:
MULTIMEDIA '01 Proceedings of the ninth ACM international conference on Multimedia
Year:
2001

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Abstract

We introduce an algorithm that uses buffer space available at the server for smoothing disk transfers of variable bit-rate streams. Previous smoothing techniques prefetched stream data into the client buffer space, instead. However, emergence of personal computing devices with widely different hardware configurations means that we should not always assume abundance of resources at the client side. The new algorithm is shown to have optimal smoothing effect under the specified constraints. We incorporate it into a prototype server, and demonstrate significant increase in the number of streams concurrently supported at different system scales. We also extend our algorithm for striping variable bit-rate streams on heterogeneous disks. High bandwidth utilization is achieved across all the different disks, which leads to server throughput improved by several factors at high loads.