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• W2886790170 abstract "This paper investigates the message complexity of distributed information spreading (a.k.a gossip or token dissemination) in adversarial dynamic networks, where the goal is to spread $k$ tokens of information to every node on an $n$-node network. We consider the amortized (average) message complexity of spreading a token, assuming that the number of tokens is large. Our focus is on token-forwarding algorithms, which do not manipulate tokens in any way other than storing, copying, and forwarding them. We consider two types of adversaries that arbitrarily rewire the network while keeping it connected: the adaptive adversary that is aware of the status of all the nodes and the algorithm (including the current random choices), and the oblivious adversary that is oblivious to the random choices made by the algorithm. The central question that motivates our work is whether one can achieve subquadratic amortized message complexity for information spreading. We present two sets of results depending on how nodes send messages to their neighbors: (1) Local broadcast: We show a tight lower bound of $Omega(n^2)$ on the number of amortized local broadcasts, which is matched by the naive flooding algorithm, (2) Unicast: We study the message complexity as a function of the number of dynamic changes in the network. To facilitate this, we introduce a natural complexity measure for analyzing dynamic networks called adversary-competitive message complexity where the adversary pays a unit cost for every topological change. Under this model, it is shown that if $k$ is sufficiently large, we can obtain an optimal amortized message complexity of $O(n)$. We also present a randomized algorithm that achieves subquadratic amortized message complexity when the number of tokens is not large under an oblivious adversary." @default.
• W2886790170 created "2018-08-22" @default.
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• W2886790170 date "2018-06-26" @default.
• W2886790170 modified "2023-09-27" @default.
• W2886790170 title "The Communication Cost of Information Spreading in Dynamic Networks" @default.
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