The evolution of cooperation in file sharing p2p systems: first steps

  • Authors:
  • María Esther Sosa-Rodríguez;Elizabeth Pérez-Cortés

  • Affiliations:
  • Electrical Engineering Department, Universidad Autónoma Metropolitana Unidad Iztapalapa, Mexico;Electrical Engineering Department, Universidad Autónoma Metropolitana Unidad Iztapalapa, Mexico

  • Venue:
  • MICAI'12 Proceedings of the 11th Mexican international conference on Advances in Computational Intelligence - Volume Part II
  • Year:
  • 2012

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Abstract

In order to cope with the free-riding problem in file sharing P2P systems, two kinds of incentive mechanisms have been proposed: reciprocity based and currency based. The main goal of this work was to study the impact of those incentive mechanisms in the emergence of cooperation in file sharing P2P systems. For each kind of incentive mechanism we designed a game and the outcome of this game was used as a fitness function to carry out an evolutionary process. We were able to observe that the Currency Game obtains an enough cooperative population slightly faster than the Reciprocity Game but, in the long run, the Reciprocity Game outperforms the Currency Game because the final populations under the former are consistently more cooperative than the final populations produced by the latter.