Best semi-online algorithms for unbounded parallel batch scheduling

Best semi-online algorithms for unbounded parallel batch scheduling
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无界并行批量调度的最佳半在线算法

DOI:
10.1016/j.dam.2011.01.003
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发表时间:
2011-04
影响因子:
1.1
通讯作者:
Cheng, T. C. E.
Cheng, T. C. E.
中科院分区:
数学3区
文献类型:
--
作者:
Yuan, Jinjiang;Ng, C. T.;Cheng, T. C. E.

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我们考虑无界并行批处理机的半在线调度,以最小化完工时间,其中在当前时刻t,t之后到达的第一个最长作业的信息已知。在线表示工件随时间到达,J(t)表示在t之后到达的第一个最长工件,p(t)和r(t)分别表示J(t)的加工时间和到达时间。给定信息p ∈(t),我们给出了一个竞争比为(5−5)/2 ∈ 1.382的在线算法,并证明了该算法是最佳的;此外,该算法最多生成两个批次。该算法也是最佳可能的给定信息J(t)。给出了一个竞争比为3/2的在线算法,并证明了任何在线算法的竞争比都不可能小于33 <$1.442,而且该算法最多生成三个批次.在给定信息r_n(t)的条件下,提出了一个竞争比为(5+1)/2 <$1.618的在线算法,并证明了该算法是最优的.
We consider semi-online scheduling of an unbounded parallel batch machine to minimize the makespan where, at the present time instant t, information on the first longest job arriving after t is known. In this paper online means that jobs arrive over time, J∗(t) denotes the first longest job arriving after t, and p∗(t) and r∗(t) denote the processing time and arrival time of J∗(t), respectively. Given information p∗(t), we present an online algorithm with a competitive ratio (5−5)/2≈1.382, and show that the algorithm is the best possible; furthermore, this algorithm generates at most two batches. This algorithm is also the best possible given information J∗(t). Given information r∗(t), we present an online algorithm with a competitive ratio 3/2, and show that any online algorithm cannot have a competitive ratio less than 33≈1.442; furthermore, this algorithm generates at most three batches. Given information r∗(t) with the restriction that an online algorithm generates at most two batches, we present an online algorithm with a competitive ratio (5+1)/2≈1.618, and show that the algorithm is the best possible.
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