An agent-oriented, trust-aware approach to improve the QoS in dynamic grid federations

摘要

In this paper, a distributed approach aimed at improving the quality of service in dynamic grid federationsrnis presented. Virtual organizations (VO) are grouped into large-scale federations in which the original goalsrnand scheduling mechanisms are left unchanged, while grid nodes can be quickly instructed to join or leavernany VO at any time. Moreover, an agent-oriented framework is designed to observe and characterize pastrnbehaviors of nodes in terms of resource sharing and consumption, as well as to determine the trust relationshipsrnoccurring between each pair of nodes. By combining trust and historical behaviors into a unifiedrnconvenience measure, software agents are able to evaluate the (i) advantages of node’s membership with VOsrnand (ii) whether a specific set of nodes is able to meet the actual requirements, in terms of resource sharingrnand consumption of a specific VO. The convenience measure has been exploited to design a fully decentralized,rngreedy procedure, aimed at controlling the grid formation process. Extensive simulations have shownrnthat the coordinated and decentralized process of grid formation provides a powerful means to improve thernoverall quality of service of the grid federation.