Um simulador discreto escalável e extensível do OurGrid.

Abstract

Due to the lack of simulation standards in the context of grid computing, the vast majority of the researchers end up writing their simulation tools from the scratch, and in an ad-hoc basis. That leads to an extra effort of design, implementation and validation. Each paper that presents a new simulator not only carries the risk of validation flaws, possibly avoided with the reuse of a mature simulation tool, but also delivers a simplistic model for the application or platform level, which is unlikely to be reused or reproduced in future works. This fact can be noticed in most of the OurGrid publications, a middleware that enables the creation of peer-to-peer computational grids, which is developed in the Distributed Systems Lab of this very University. Many authors write different simulators in order to evaluate different aspects of this middleware. The objective of this work is to present the implementation techniques of a discrete simulator to the OurGrid. starting from a simulation model that should be generic enough to be easily reused in different levels of abstraction and functionality. That means that the model must comprise most of the aspects of the real system and must be easily configurable to the different levels of research needs. We validated the proposed simulation model against completeness, accuracy, scalability, speed, extensibility, and testability requirements. Finally, we present some use cases that depict the extension of this model for specific research needs.