Scheduling Jobs on Grid Processors

摘要

We study a new kind of on-line bin packing, motivated by a problem arising when scheduling jobs on the Grid. In this bin packing problem, the set of items is given at the beginning, and variable-sized bins arrive one by one. We analyze the problem using both the competitive ratio and the relative worst order ratio, observing that the two measures often lead to different conclusions.rnA closely related problem was introduced by Zhang (Discrete Appl. Math. 72:193-197, 1997). Our main result answers a question posed in that paper in the affirmative: we give an algorithm with a competitive ratio strictly better than 2, for our problem as well as Zhang's problem. For identical bins, the new algorithm has essentially the same performance as FFD (First-Fit-Decreasing).