Models and algorithms for stochastic online scheduling

N. Megow, M.J. Uetz, T. Vredeveld

Research output: Contribution to journalArticleAcademicpeer-review

41 Citations (Scopus)

Abstract

We consider a model for scheduling under, uncertainty. In this model, we combine the main characteristics of online and stochastic scheduling in a simple and natural way. Job processing times are assumed to be stochastic, but in contrast to traditional stochastic scheduling models, we assume that jobs arrive online, and there is no knowledge about the jobs that will arrive in the future. The model incorporates both stochastic scheduling and online scheduling as a special case. The particular setting we consider is nonpreemptive parallel machine scheduling, with the objective to minimize the total weighted completion times of jobs. We analyze simple, combinatorial online scheduling policies for that model, and derive performance guarantees that match performance guarantees previously known for stochastic and online parallel machine scheduling, respectively. For processing times that follow new better than used in expectation (NBUE) distributions, we improve upon previously best-known performance bounds from stochastic scheduling, even though we consider a more general setting.
Original languageEnglish
Pages (from-to)513-525
JournalMathematics of Operations Research
Volume31
Issue number3
DOIs
Publication statusPublished - 1 Jan 2006

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