Randomized Rumour Spreading: The Effect of the Network Topology
Randomized Rumour Spreading: The Effect of the Network Topology
复制标题
随机谣言传播:网络拓扑的影响
DOI:
10.1017/s0963548314000194
复制
发表时间:
2015
期刊:
影响因子:
--
通讯作者:
H. Sun
中科院分区:
文献类型:
--
作者:
K. Panagiotou;X. Perez-Gimenez;T. Sauerwald;H. Sun
We consider the popular and well-studied push model, which is used to spread information in a given network with n vertices. Initially, some vertex owns a rumour and passes it to one of its neighbours, which is chosen randomly. In each of the succeeding rounds, every vertex that knows the rumour informs a random neighbour. It has been shown on various network topologies that this algorithm succeeds in spreading the rumour within O(log n) rounds. However, many studies are quite coarse and involve huge constants that do not allow for a direct comparison between different network topologies. In this paper, we analyse the push model on several important families of graphs, and obtain tight runtime estimates. We first show that, for any almost-regular graph on n vertices with small spectral expansion, rumour spreading completes after log2n + log n+o(log n) rounds with high probability. This is the first result that exhibits a general graph class for which rumour spreading is essentially as fast as on complete graphs. Moreover, for the random graph G(n,p) with p=c log n/n, where c > 1, we determine the runtime of rumour spreading to be log2n + γ (c)log n with high probability, where γ(c) = clog(c/(c−1)). In particular, this shows that the assumption of almost regularity in our first result is necessary. Finally, for a hypercube on n=2d vertices, the runtime is with high probability at least (1+β) ⋅ (log2n + log n), where β > 0. This reveals that the push model on hypercubes is slower than on complete graphs, and thus shows that the assumption of small spectral expansion in our first result is also necessary. In addition, our results combined with the upper bound of O(log n) for the hypercube (see [11]) imply that the push model is faster on hypercubes than on a random graph G(n, clog n/n), where c is sufficiently close to 1.
登录
查看更多内容
DOI:
10.1007/978-3-540-32439-3
发表时间:
2006
期刊:
ArXiv
影响因子:
--
作者:
E. Győri;G. Katona;L. Lovász;T. Fleiner
通讯作者:
T. Fleiner
影响因子:
1
作者:
Colin Cooper;A. Frieze
通讯作者:
Colin Cooper;A. Frieze
DOI:
--
发表时间:
--
期刊:
影响因子:
--
作者:
通讯作者:
--
DOI:
--
发表时间:
2010
期刊:
2010 Proceedings IEEE INFOCOM
影响因子:
--
作者:
N. Fountoulakis;Anna Huber;K. Panagiotou
通讯作者:
K. Panagiotou
DOI:
10.4230/lipics.stacs.2009.1842
发表时间:
2009
期刊:
ArXiv
影响因子:
--
作者:
Robert Elsässer;Thomas Sauerwald
通讯作者:
Thomas Sauerwald