The Gittins Policy is Nearly Optimal in the M/G/k under Extremely General Conditions

The Gittins Policy is Nearly Optimal in the M/G/k under Extremely General Conditions
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在极其一般的条件下,Gittins 策略在 M/G/k 中几乎是最优的

DOI:
10.1145/3428328
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发表时间:
2020
期刊:
Proceedings of the ACM on Measurement and Analysis of Computing Systems
影响因子:
--
通讯作者:
Harchol-Balter, Mor
Harchol-Balter, Mor
中科院分区:
--
文献类型:
--
作者:
Scully, Ziv;Grosof, Isaac;Harchol-Balter, Mor

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在各种设置下,Gittins调度策略将单服务器M/G/1队列中的平均响应最小化。最著名的是,当允许抢占并且服务需求未知但来自已知发行版时,Gittins是最佳的。一般而言,Gittins也是最优的,可以适应任何数量的可用信息和任何抢占限制。然而,在多服务器环境中,特别是在中央队列M/G/k中,最小化平均响应时间的调度是一个困难得多的问题。在这项工作中,我们首先给出了Gittins在M/G/k中的一般分析.具体地说,我们证明了在极其一般的条件下,Gittins在M/G/k中的平均响应时间至多是它在M/G/1加上一个加性项的平均响应时间,其中ρ是系统负载.这一结果的结果是,如果服务需求分布S满足$\mathbfE[S^2(łog S)^+]<\inty$,则Gittins在M/G/k中是大流量最优的。这是迄今为止关于最小化M/G/k中的平均响应时间的最一般结果。为了证明我们的结果,我们以一种新颖的方式结合了Gittins策略和Palm演算的性质。值得注意的是,我们的技术克服了先前调度分析中使用的标记作业方法的局限性。
The Gittins scheduling policy minimizes the mean response in the single-server M/G/1 queue in a wide variety of settings. Most famously, Gittins is optimal when preemption is allowed and service requirements are unknown but drawn from a known distribution. Gittins is also optimal much more generally, adapting to any amount of available information and any preemption restrictions. However, scheduling to minimize mean response time in a multiserver setting, specifically the central-queue M/G/k, is a much more difficult problem. In this work we give the first general analysis of Gittins in the M/G/k. Specifically, we show that under extremely general conditions, Gittins's mean response time in the M/G/k is at most its mean response time in the M/G/1 plus anadditive term, where ρ is the system load. A consequence of this result is that Gittins is heavy-traffic optimal in the M/G/k if the service requirement distribution S satisfies $\mathbfE [S^2(łog S)^+] < \infty$. This is the most general result on minimizing mean response time in the M/G/k to date. To prove our results, we combine properties of the Gittins policy and Palm calculus in a novel way. Notably, our technique overcomes the limitations of tagged job methods that were used in prior scheduling analyses.
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