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- W2045971730 abstract "We analyze the shortest remaining processing time (SRPT) algorithm with respect to the problem of scheduling n jobs with release times on m identical machines to minimize total flow time. It is known that SRPT is optimal if m = 1 but that SRPT has a worstcase approximation ratio of Θ(min(log n/m, log Δ)) for this problem, where Δ is the ratio of the length of the longest job divided by the length of the shortest job. It has previously been shown that SRPT is able to use faster machines to produce a schedule as good as an optimal algorithm using slower machines. We now show that SRPT optimally uses these faster machines with respect to the worst-case approximation ratio. That is, if SRPT is given machines that are s ≥ 2 - 1/m times as fast as those used by an optimal algorithm, SRPT's flow time is at least s times smaller than the flow time incurred by the optimal algorithm. Clearly no algorithm can offer a better worst-case guarantee, and we show that existing algorithms with similar performance guarantees to SRPT without resource augmentation do not optimally use extra resources." @default.
- W2045971730 created "2016-06-24" @default.
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- W2045971730 date "2004-01-11" @default.
- W2045971730 modified "2023-09-23" @default.
- W2045971730 title "SRPT optimally utilizes faster machines to minimize flow time" @default.
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- W2045971730 doi "https://doi.org/10.5555/982792.982842" @default.
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