Low-Congestion shortcuts without embedding
Low-Congestion shortcuts without embedding
复制标题
无需嵌入的低拥塞快捷方式
DOI:
10.1007/s00446-020-00383-2
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发表时间:
2021
影响因子:
1.3
通讯作者:
Zuzic, Goran
中科院分区:
文献类型:
--
作者:
Haeupler, Bernhard;Izumi, Taisuke;Zuzic, Goran
Distributed optimization algorithms are frequently faced with solving sub-problems on disjoint connected parts of a network. Unfortunately, the diameter of these parts can be significantly larger than the diameter of the underlying network, leading to slow running times. This phenomenon can be seen as the broad underlying reason for the pervasive Ω~(n+ D) lower bounds that apply to most optimization problems in the CONGEST model. On the positive side,[Ghaffari and Hauepler; SODA’16] introduced low-congestion shortcuts as an elegant solution to circumvent this problem in certain topologies of interest. Particularly, they showed that there exist good shortcuts for any planar network and more generally any bounded genus network. This directly leads to fast O (D log O (1) n) distributed algorithms for MST and Min-Cut approximation, given that one can efficiently construct these shortcuts in a distributed manner. Unfortunately, the shortcut construction of [Ghaffari and Hauepler; SODA’16] relies heavily on having access to a genus embedding of the network. Computing such an embedding distributedly, however, is a hard problem—even for planar networks. No distributed embedding algorithm for bounded genus graphs is in sight. In this work, we side-step this problem by defining tree-restricted shortcuts: a more structured and restricted form of shortcuts. We give a novel construction algorithm which efficiently finds such shortcuts that are, up to a logarithmic factor, as good as the best restricted shortcuts that exist for a given network. This new construction algorithm directly leads to an O (D log O (1) n)-round algorithm for solving optimization problems like MST for any topology for which good restricted shortcuts exist—without the need to compute any embedding. This greatly simplifies the existing planar algorithms and includes the first efficient algorithm for bounded genus graphs.
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DOI:
10.1145/2488608.2488656
发表时间:
2012-10
期刊:
--
影响因子:
--
作者:
C. Lenzen;B. Patt-Shamir
通讯作者:
C. Lenzen;B. Patt-Shamir
DOI:
10.1145/3212734.3212737
发表时间:
2018
期刊:
ACM SIGACT-SIGOPS Symposium on Principles of Distributed Computing
影响因子:
--
作者:
Haeupler, Bernhard;Hershkowitz, D. Ellis;Wajc, David
通讯作者:
Wajc, David
DOI:
10.1145/2933057.2933109
发表时间:
2016
期刊:
Proceedings of the 2016 ACM Symposium on Principles of Distributed Computing
影响因子:
--
作者:
M. Ghaffari;Bernhard Haeupler
通讯作者:
Bernhard Haeupler
影响因子:
--
作者:
Danupon Nanongkai;Hsin
通讯作者:
Hsin
DOI:
--
发表时间:
2014
期刊:
International Conference on Principles of Distributed Systems
影响因子:
--
作者:
Taisuke Izumi;Roger Wattenhofer
通讯作者:
Roger Wattenhofer