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What and Who
Title:Towards Optimal Synchronous Counting
Speaker:Joel Rybicki
coming from:Max-Planck-Institut für Informatik - D1
Speakers Bio:
Event Type:Talk
Visibility:D1, D2, D3, D4, D5, RG1, SWS, MMCI
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Level:MPI Audience
Date, Time and Location
Date:Friday, 27 March 2015
Duration:45 Minutes
Building:E1 4
Consider a complete communication network of n nodes, where the nodes receive a common clock pulse. We study the synchronous c-counting problem: given any starting state and up to f faulty nodes with arbitrary behaviour, the task is to eventually have all correct nodes counting modulo c in agreement. Thus, we are considering algorithms that are self-stabilizing despite Byzantine failures. In this work, we give new algorithms for the synchronous counting problem that (1) are deterministic, (2) have linear stabilisation time in f, (3) use a small number of states, and (4) achieve almost-optimal resilience. Prior algorithms either resort to randomisation, use a large number of states, or have poor resilience. In particular, we achieve an exponential improvement in the space complexity of deterministic algorithms, while still achieving linear stabilisation time and almost-linear resilience.

This is joint work with Christoph Lenzen and Jukka Suomela.


Name(s):Joel Rybicki
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Created:Joel Rybicki, 03/25/2015 01:57 PM Last modified:Uwe Brahm/MPII/DE, 11/24/2016 04:13 PM
  • Joel Rybicki, 03/25/2015 02:00 PM
  • Joel Rybicki, 03/25/2015 01:57 PM -- Created document.