Reputação autônoma como incentivo à colaboração no compartilhamento de recursos computacionais.

Abstract

Grid computing emerged as a way of gathering an arbitrary amount of resources from different administrative domains. However, assembling a computational grid nowadays involves human negotiation with the resource owners. The need of this negotiation limits the size of the grids used in production today. There are proposals for solving this problem creating a currency-based economy, but there is no currency-based solution largely used in production currently. As an alternative to these proposals, some have proposed peer-to-peer resource sharing systems. Although this proposal doesn’t solve the general grid assembling problem, it allows building solutions of easy deployment and adoption in short term. Our- Grid is a peer-to-peer grid that targets Bag-of-Tasks applications (those parallel applications whose tasks are independent) being developed in UFCG in collaboration with HP. As in most peer-to-peer systems, free-riding is an issue that must be addressed in OurGrid. This dissertation presents the Network of Favors, an autonomous peer-to-peer reputation scheme that aims to encourage collaboration in OurGrid. Through the autonomous behavior of the peers in the system, the peers who collaborate more are prioritized when they request resources from the community. Being completely autonomous, the Network of Favors has easy implementation and deploying, allowing its use in production in OurGrid without adding significant complexity to its adoption.