Controlling and Assessing Correlations of Cost Matrices in Heterogeneous Scheduling
This paper considers the problem of allocating independent tasks to unrelated machines such as to minimize the maximum completion time. Testing heuristics for this problem requires the generation of cost matrices that specify the execution time of each task on each machine. Numerous studies showed that the task and machine heterogeneities belong to the properties impacting heuristics performance the most. This study focuses on orthogonal properties, the average correlations between each pair of rows and each pair of columns, which is a proximity measure with uniform instances (Uniform instances are particular unrelated instances in which each execution time is proportional to the weight of the task and the cycle time of the machine.). Cost matrices generated with a novel generation method show the effect of these correlations on the performance of several heuristics from the literature. In particular, EFT performance depends on whether the tasks are more correlated than the machines and HLPT performs the best when both correlations are close to one.
Computations have been performed on the supercomputer facilities of the Mésocentre de calcul de Franche-Comté.
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