Searching for pareto-optimal randomised algorithms

  • Authors:
  • Alan G. Millard;David R. White;John A. Clark

  • Affiliations:
  • Department of Computer Science, University of York, UK;School of Computing Science, University of Glasgow, UK;Department of Computer Science, University of York, UK

  • Venue:
  • SSBSE'12 Proceedings of the 4th international conference on Search Based Software Engineering
  • Year:
  • 2012

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Abstract

Randomised algorithms traditionally make stochastic decisions based on the result of sampling from a uniform probability distribution, such as the toss of a fair coin. In this paper, we relax this constraint, and investigate the potential benefits of allowing randomised algorithms to use non-uniform probability distributions. We show that the choice of probability distribution influences the non-functional properties of such algorithms, providing an avenue of optimisation to satisfy non-functional requirements. We use Multi-Objective Optimisation techniques in conjunction with Genetic Algorithms to investigate the possibility of trading-off non-functional properties, by searching the space of probability distributions. Using a randomised self-stabilising token circulation algorithm as a case study, we show that it is possible to find solutions that result in Pareto-optimal trade-offs between non-functional properties, such as self-stabilisation time, service time, and fairness.