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Author (up) Becker, F.; Kosowski, A.; Matamala, M.; Nisse, N.; Rapaport, I.; Suchan, K.; Todinca, I.
Title Allowing each node to communicate only once in a distributed system: shared whiteboard models Type
Year 2015 Publication Distributed Computing Abbreviated Journal Distrib. Comput.
Volume 28 Issue 3 Pages 189-200
Keywords Distributed computing; Local computation; Graph properties; Bounded communication
Abstract In this paper we study distributed algorithms on massive graphs where links represent a particular relationship between nodes (for instance, nodes may represent phone numbers and links may indicate telephone calls). Since such graphs are massive they need to be processed in a distributed way. When computing graph-theoretic properties, nodes become natural units for distributed computation. Links do not necessarily represent communication channels between the computing units and therefore do not restrict the communication flow. Our goal is to model and analyze the computational power of such distributed systems where one computing unit is assigned to each node. Communication takes place on a whiteboard where each node is allowed to write at most one message. Every node can read the contents of the whiteboard and, when activated, can write one small message based on its local knowledge. When the protocol terminates its output is computed from the final contents of the whiteboard. We describe four synchronization models for accessing the whiteboard. We show that message size and synchronization power constitute two orthogonal hierarchies for these systems. We exhibit problems that separate these models, i.e., that can be solved in one model but not in a weaker one, even with increased message size. These problems are related to maximal independent set and connectivity. We also exhibit problems that require a given message size independently of the synchronization model.
Address [Becker, Florent; Todinca, Ioan] Univ Orleans, LIFO, Orleans, France, Email: florent.becker@univ-orleans.fr;
Corporate Author Thesis
Publisher Springer Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0178-2770 ISBN Medium
Area Expedition Conference
Notes WOS:000354708400003 Approved
Call Number UAI @ eduardo.moreno @ Serial 492
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Author (up) Becker, F.; Montealecre, P.; Rapaport, I.; Todinca, I.
Title The Impact Of Locality In The Broadcast Congested Clique Model Type
Year 2020 Publication Siam Journal On Discrete Mathematics Abbreviated Journal SIAM Discret. Math.
Volume 34 Issue 1 Pages 682-700
Keywords broadcast congested clique; induced cycles; graph degeneracy
Abstract The broadcast congested clique model (BCLIQUE) is a message-passing model of distributed computation where n nodes communicate with each other in synchronous rounds. First, in this paper we prove that there is a one-round, deterministic algorithm that reconstructs the input graph G if the graph is d-degenerate, and rejects otherwise, using bandwidth b = O(d . log n). Then, we introduce a new parameter to the model. We study the situation where the nodes, initially, instead of knowing their immediate neighbors, know their neighborhood up to a fixed radius r. In this new framework, denoted BCLIQuE[r], we study the problem of detecting, in G, an induced cycle of length at most k (CYCLE <= k) and the problem of detecting an induced cycle of length at least k +1 (CYCLE>k). We give upper and lower bounds. We show that if each node is allowed to see up to distance r = left perpendicular k/2 right perpendicular + 1, then a polylogarithmic bandwidth is sufficient for solving CYCLE>k with only two rounds. Nevertheless, if nodes were allowed to see up to distance r = left perpendicular k/3 right perpendicular, then any one-round algorithm that solves CYCLE>k needs the bandwidth b to be at least Omega(n/ log n). We also show the existence of a one-round, deterministic BCLIQUE algorithm that solves CYCLE <= k with bandwitdh b = O(n(1/left perpendicular k/2 right perpendicular). log n). On the negative side, we prove that, if epsilon <= 1/3 and 0 < r <= k/4, then any epsilon-error, R-round, b-bandwidth algorithm in the BCLIQUE[r] model that solves problem CYCLE(<= k )satisfies R . b = Omega(n(1/left perpendicular k/2 right perpendicular)).
Address [Becker, F.; Todinca, I] Univ Orleans, INSA Ctr Val Loire, LIFO EA 4022, Orleans, France, Email: florent.becker@univ-orleans.fr;
Corporate Author Thesis
Publisher Siam Publications Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0895-4801 ISBN Medium
Area Expedition Conference
Notes WOS:000546886700033 Approved
Call Number UAI @ eduardo.moreno @ Serial 1182
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Author (up) Becker, F.; Montealegre, P.; Rapaport, I.; Todinca, I.
Title The role of randomness in the broadcast congested clique model Type
Year 2021 Publication Information and Computation Abbreviated Journal Inf. Comput.
Volume 281 Issue Pages 104669
Keywords Distributed computing; Broadcast congested clique; Message size complexity; Private and public coins; Simultaneous multi-party communication
Abstract We study the role of randomness in the broadcast congested clique model. This is a message-passing model of distributed computation where the nodes of a network know their local neighborhoods and they broadcast, in synchronous rounds, messages that are visible to every other node.

This works aims to separate three different settings: deterministic protocols, randomized protocols with private coins, and randomized protocols with public coins. We obtain the following results:

If more than one round is allowed, public randomness is as powerful as private ran-domness.

One-round public-coin algorithms can be exponentially more powerful than determin-istic algorithms running in several rounds.

One-round public-coin algorithms can be exponentially more powerful than one-round private-coin algorithms.

One-round private-coin algorithms can be exponentially more powerful than one-round deterministic algorithms.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0890-5401 ISBN Medium
Area Expedition Conference
Notes WOS:000721215200042 Approved
Call Number UAI @ alexi.delcanto @ Serial 1491
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