Svirin P. Methods for resource brokers design for decentralized grid environments using additional data sources

The dissertation is devoted to the investigation and development of the methods for design of resource brokers for decentralized Grid environments. The specifics of grid environments resource brokers have been researched together with the advantages and the disadvantages of load distribution algorithms. The methods for computation resource have been enhanced with the parameters taken from additional information sources in order to enhance the state description for a computation resource. The method for compensation of the absence of some parameters necessary to calculate the rank for a computation resource has been implemented, thus even if a resource has incomplete description it can still take part in the resource ranking and selection. The architecture for task rescheduling has been developed which allows to transfer the task from the resources with a long task queue to free resources, this approach allows to start the tasks that spend a lo of time in the queue immediately. The methods developed are implemented as modules compatible with GridALLTED circuit simulation software and also for ALICE experiment processing software. Keywords: Grid, brokers, web services, Nordugrid ARC, load balancing, service registry, load balancing policies, decentralized systems, computational resources, resource ranking.