Anderson, Edward J. and Potts, Chris N.
Online scheduling of a single machine to minimize total weighted completion time
Mathematics of Operations Research, 29, (3), . (doi:10.1287/moor.1040.0092).
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This paper considers the online scheduling of a single machine in which jobs arrive over time, and preemption is not allowed. The goal is to minimize the total weighted completion time. We show that a simple modification of the shortest weighted processing time rule has a competitive ratio of two. This result is established using a new proof technique that does not rely explicitly on a lower bound on the optimal objective function value. Because it is known that no online algorithm can have a competitive ratio of less than two, we have resolved the open issue of determining the minimum competitive ratio for this problem.
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