The scale-free graphs were proposed as a generic and universal model of network topologies that exhibit power-law distributions in the connectivity of network nodes. In recent years various complex networks were identified as having a scale-free structure. Little research was done concerning the network structure for DisCSP, and in particular, for scale-free networks. The asynchronous searching techniques are characterized by the occurrence of nogood values during the search for a solution. In this article we analyze the distribution of nogood values to agents and the way how to use the information from the nogood; that is called the nogood processor technique. We examine the effect of nogood processor for networks that have a scale-free structure aiming to develop search algorithms specialized for scale-free networks of constraints, algorithms that require minimum costs for obtaining the solution. We develop a novel way for distributing nogood values to agents, thus obtaining a new hybrid search technique that uses the information from the stored nogoods. The experiments show that it is more effective for several families of asynchronous techniques; we perform tests with the model running on a cluster of computers. Also, we examine the effect of synchronization of agents' execution and of processing messages by packets in scale-free networks.
Publié le : 2015-06-19
Classification:  Parallel and Distributed Computing,  Agents, distributed constraint programming, asynchronous search break techniques, scale-free networks, nogood messages,  68T42
@article{cai2059,
     author = {Ionel Muscalagiu; The "Politehnica" University of Timisoara, The Faculty of Engineering of Hunedoara and Horia Emil Popa; West University of Timisoara, The Faculty of Mathematics and Informatics and Viorel Negru; West University of Timisoara, The Faculty of Mathematics and Informatics},
     title = {Improving the Performances of Asynchronous Search Algorithms in Scale-Free Networks Using the Nogood Processor Technique},
     journal = {Computing and Informatics},
     volume = {33},
     number = {3},
     year = {2015},
     language = {en},
     url = {http://dml.mathdoc.fr/item/cai2059}
}
Ionel Muscalagiu; The "Politehnica" University of Timisoara, The Faculty of Engineering of Hunedoara; Horia Emil Popa; West University of Timișoara, The Faculty of Mathematics and Informatics; Viorel Negru; West University of Timișoara, The Faculty of Mathematics and Informatics. Improving the Performances of Asynchronous Search Algorithms in Scale-Free Networks Using the Nogood Processor Technique. Computing and Informatics, Tome 33 (2015) no. 3, . http://gdmltest.u-ga.fr/item/cai2059/