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- W2083173650 abstract "We consider basic problems of non-preemptive scheduling on uniformly related machines. For a given schedule, defined by a partition of the jobs into m subsets corresponding to the m machines, $$C_i$$ C i denotes the completion time of machine i. Our goal is to find a schedule that minimizes or maximizes $$sum _{i=1}^m C_i^p$$ ? i = 1 m C i p for a fixed value of p such that $$0 1$$ p > 1 the minimization problem is equivalent to the well-known problem of minimizing the $$ell _p$$ l p norm of the vector of the completion times of the machines, and for $$0<p<1$$ 0 < p < 1 , the maximization problem is of interest. Our main result is an efficient polynomial time approximation scheme (EPTAS) for each one of these problems. Our schemes use a non-standard application of the so-called shifting technique. We focus on the work (total size of jobs) assigned to each machine and introduce intervals of work that are forbidden. These intervals are defined so that the resulting effect on the goal function is sufficiently small. This allows the partition of the problem into sub-problems (with subsets of machines and jobs) whose solutions are combined into the final solution using dynamic programming. Our results are the first EPTAS's for this natural class of load balancing problems." @default.
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- W2083173650 date "2013-08-27" @default.
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- W2083173650 title "An efficient polynomial time approximation scheme for load balancing on uniformly related machines" @default.
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