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首页> 外文期刊>Discrete Applied Mathematics >Scheduling tree-like task systems with non-uniform deadlines subject to unit-length communication delays
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Scheduling tree-like task systems with non-uniform deadlines subject to unit-length communication delays

机译:期限不统一的树状任务系统的调度受单位长度通信延迟的影响

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We consider the problem of scheduling outforests and inforests with non-uniform deadlines subject to unit-length communication delays. We will prove that minimum-tardiness schedules for outforests on two processors and for chain-like task systems on m processors can be constructed in polynomial time. In addition, we present two polynomial-rime approximation algorithms: one with an asymptotic approximation bound of 2 - 2/m for scheduling outforests with non-positive deadlines on m processors and one with an asymptotic approximation:bound of 2 for scheduling inforests with non-positive deadlines on m processors. Moreover, it is proved that for a special class of inforests, minimum-tardiness schedules on m processors can be constructed in polynomial time. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 16]
机译:我们考虑在单位长度通信延迟的情况下,在期限不统一的情况下安排外林和森林的问题。我们将证明,可以在多项式时间内构造两个处理器上的外林和m个处理器上的链式任务系统的最小延迟时间表。此外,我们提出了两种多项式近似算法:一种用于在m个处理器上以非正数截止时间来调度具有非正负期限的外林,其渐近近似界为2-2 / m,另一种是采用渐近式:用于调度具有非截止期限的森林中的2界。 -m个处理器的最后期限。此外,事实证明,对于一类特殊的森林,可以在多项式时间内构造m个处理器上的最小拖延进度。 (C)2000 Elsevier Science B.V.保留所有权利。 [参考:16]

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