Improved competitive algorithms for two-processor real-time systems

Document Type

Article

Publication Date

12-1-2004

Abstract

The problem of competitive on-line scheduling in two-processor real-time environments is studied. The model of Koren and Shasha is followed: Every task has a deadline and a value that it obtains only if it completes by its deadline - the value being its computation time. The goal is to design on-line schedulers with worst-case guarantees compared with a clairvoyant scheduler. Koren and Shasha gave algorithms for the migration and no-migration models, with competitive multipliers of 2 and 3, respectively. In this article, we give an algorithm for the no-migration model with an improved competitive multiplier of 2(1+16). We also show that the competitive multiplier for the migration model can be lowered by using a fast processor and a slow processor, compared with using several parallel and identical processors with the same aggregate computing power. © 2004 World Scientific Publishing Company.

Identifier

33748293761 (Scopus)

Publication Title

International Journal of Foundations of Computer Science

External Full Text Location

https://doi.org/10.1142/S0129054104002728

ISSN

01290541

First Page

733

Last Page

751

Issue

5

Volume

15

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