Cost-Oblivious Reallocation for Scheduling and Planning
Cost-Oblivious Reallocation for Scheduling and Planning
复制标题
用于调度和规划的成本无关的重新分配
DOI:
10.1145/2755573.2755589
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
S. Gilbert
中科院分区:
文献类型:
--
作者:
M.E. Bender;M. Farach-Colton;S.P. Fekete;J. Fineman;S. Gilbert
In a reallocating-scheduler problem, jobs may be inserted and deleted from the system over time. Unlike in traditional online scheduling problems, where a job's placement is immutable, in reallocation problems the schedule may be adjusted, but at some cost. The goal is to maintain an approximately optimal schedule while also minimizing thereallocation costfor changing the schedule.This paper gives a reallocating scheduler for the problem of assigning jobs top(identical) servers so as to minimize the sum of completion times to within a constant factor of optimal, with an amortized reallocation cost for a length-wjob ofO(f(w)log3logΔ), where Delta is the length of the longest job andf() is the reallocation-cost function. Our algorithm is cost oblivious, meaning that the algorithm is not parameterized byf(), yet it achieves this bound for any subadditivef(). Wheneverf() is strongly subadditive, the reallocation cost becomesO(f(w)).To realize a reallocating scheduler with low reallocation cost, we design ak-cursor sparse table. This data structure stores a dynamic set of elements in an array, with insertions and deletions restricted tokcursors in the structure. The data structure achieves an amortized cost ofO(log3k) for insertions and deletions, while also guaranteeing that any prefix of the array has constant density. Observe that this bound does not depend on n, the number of elements, and hence this data structure, restricted tok<<ncursors, beats the lower bound of Ω(log2n) for general sparse tables.
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DOI:
10.1002/nav.3800330414
发表时间:
1986
期刊:
Naval Research Logistics Quarterly
影响因子:
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作者:
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通讯作者:
C. Tovey
影响因子:
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作者:
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影响因子:
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DOI:
10.1007/978-0-387-34735-6_21
发表时间:
2006
期刊:
Naval Research Logistics Quarterly
影响因子:
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作者:
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通讯作者:
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DOI:
--
发表时间:
2010
期刊:
Embedded Systems and Applications
影响因子:
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作者:
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通讯作者:
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