Department of Computer Science | Institute of Theoretical Computer Science | CADMO

Theory of Combinatorial Algorithms

Prof. Emo Welzl and Prof. Bernd Gärtner

Mittagsseminar (in cooperation with M. Ghaffari, A. Steger and B. Sudakov)

Mittagsseminar Talk Information

Date and Time: Tuesday, April 22, 2008, 12:15 pm

Duration: This information is not available in the database

Location: CAB G51

Speaker: Fabian Kuhn

Tight Bounds for Distributed Selection

In today's computing environments, data is no longer stored at one central server. Often, data is distributed across many heterogeneous locations that are connected through a network. Nevertheless, there need to be efficient methods to query large data sets. In the talk, I will consider the problem of distributed k-selection where, given a connected graph of diameter D consisting of n nodes in which every node holds an element, the goal is to determine the kth smallest of these elements. I will present a simple distributed randomized algorithm with time complexity O(D*log_D(n)) and I will prove a lower bound of Omega(D*log_D(n)) implying that the presented algorithm is asymptotically optimal.

Joint work with Thomas Locher and Roger Wattenhofer.


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