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Desktop Grids leverage otherwise unused resources of idle desktop computers, providing vast amounts of cumulative computational power. However, resource sharing in Peer-to-Peer environments with selfish participants suffers from the free-riding phenomenon unless the environment provides appropriate countermeasures. In Peer-to-Peer-based Desktop Grids, cooperative participants require protection against free-riding job distributors. In this paper, the authors present a decentralized shared-history reputation mechanism designed for use with Desktop Grids built on dynamic super-peer structures. Embedded in a distributed Desktop Grid workflow model, their concept promotes reciprocity and discourages free-riding.
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