Abstract
Desktop grids (DG) offer large amounts of computing power coming from internet-based volunteer networks. They suffer from the free-riding phenomenon. It may be possible for users to free ride, consuming resources donated by others but not donating any of their own. In this paper, we present PGTrust: our decentralized free-riding prevention model designed for PastryGrid. PastryGrid is a decentralized DG system which manages resources over a decentralized P2P network. PGTrust relies on the notion of score which is a metric of reputation used to evaluate the level of QoS of a peer. We have conducted out experimentations on Grid'5000 testbed. Obtained results prove the benefits of our free-riding prevention model. PGTrust is able to improve application running time by discouraging free-riders and motivating selfish peers to contribute. It offers a considerable speedup over distributed applications.
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