Semi-Online Preemptive Scheduling: One Algorithm for All Variants

Authors Tomas Ebenlendr, Jiri Sgall

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Tomas Ebenlendr
Jiri Sgall

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Tomas Ebenlendr and Jiri Sgall. Semi-Online Preemptive Scheduling: One Algorithm for All Variants. In 26th International Symposium on Theoretical Aspects of Computer Science. Leibniz International Proceedings in Informatics (LIPIcs), Volume 3, pp. 349-360, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2009)


We present a unified optimal semi-online algorithm for preemptive scheduling on uniformly related machines with the objective to minimize the makespan. This algorithm works for all types of semi-online restrictions, including the ones studied before, like sorted (decreasing) jobs, known sum of processing times, known maximal processing time, their combinations, and so on. Based on the analysis of this algorithm, we derive some global relations between various semi-online restrictions and tight bounds on the approximation ratios for a small number of machines.
  • On-line algorithms
  • Scheduling


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