APPROXIMATION SCHEMES FOR SCHEDULING JOBS WITH CHAIN PRECEDENCE CONSTRAINTS

Author:

JANSEN KLAUS1,SOLIS-OBA ROBERTO2

Affiliation:

1. Institut für Informatik und Praktische Mathematik, Universität zu Kiel, Kiel, Germany

2. Department of Computer Science, The University of Western Ontario, London, Canada

Abstract

We study the problem of scheduling jobs with precedence constraints and present two polynomial time approximation schemes for it. The first one is for the case when the machines are identical and the precedence graph partitions the jobs into groups of fixed size. As an interesting particular case, this yields a polynomial time approximation scheme for scheduling jobs with chain or tree precedence constraints on identical machines, when each chain or tree is of constant size. The second approximation scheme is for scheduling jobs with arbitrarily long chain precedence constraints on uniformly related machines when the number of machines is fixed.

Publisher

World Scientific Pub Co Pte Lt

Subject

Computer Science (miscellaneous)

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