On Queue-Size Scaling for Input-Queued Switches
On Queue-Size Scaling for Input-Queued Switches
复制标题
关于输入队列交换机的队列大小缩放
DOI:
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发表时间:
2014
期刊:
影响因子:
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通讯作者:
Y. Zhong
中科院分区:
文献类型:
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作者:
Devavrat Shah;J. Tsitsiklis;Y. Zhong
We study the optimal scaling of the expected total queue size in an $n imes n$ input-queued switch, as a function of the number of ports $n$ and the load factor $
ho$, which has been conjectured to be $Theta (n/(1-
ho))$. In a recent work, the validity of this conjecture has been established for the regime where $1-
ho = O(1/n^2)$. In this paper, we make further progress in the direction of this conjecture. We provide a new class of scheduling policies under which the expected total queue size scales as $O(n^{1.5}(1-
ho)^{-1}log(1/(1-
ho)))$ when $1-
ho = O(1/n)$. This is an improvement over the state of the art; for example, for $
ho = 1 - 1/n$ the best known bound was $O(n^3)$, while ours is $O(n^{2.5}log n)$.