Non-approximability results for scheduling problems with minsum criteria

Non-approximability results for scheduling problems with minsum criteria

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Article ID: iaor20021705
Country: United States
Volume: 13
Issue: 2
Start Page Number: 157
End Page Number: 168
Publication Date: Mar 2001
Journal: INFORMS Journal On Computing
Authors: , ,
Keywords: computational analysis
Abstract:

We provide several non-approximability results for deterministic scheduling problems whose objective is to minimize the total job completion time. Unless P =NP, none of the problems under consideration can be approximated in polynomial time within arbitrarily good precision. Most of our results are derived by APX-hardness proofs. We show that, whereas scheduling on unrelated machines with unit weights is polynomially solvable, the problem becomes APX-hard if release dates or weights are added. We further show APX-hardness for scheduling in flow shops, job shops, and open shops. We also investigate the problems of scheduling on parallel machines with precedence constraints and unit processing times, and two variants of the latter problem with unit communication delays; for these problems we provide lower bounds on the worst-case behavior of any polynomial-time approximation algorithm through the gap-reduction technique.

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