Limita??o do espa?o de armazenamento de checkpoints em simula??o distribu?da otimista

Distributed simulation models that have asynchronous components are subject to time backtracking caused by time violation. Checkpoints are used for restoring consistent states prior to time violation. Throughout the simulation the components can generate non-useful checkpoints in case of throwback. In large simulations these useless checkpoints take up more and more memory, and the lack of limited storage of these checkpoints can lead the simulation to a collapse due to lack of memory. The objective of this work is to present some techniques of limiting the storage space of checkpoints and some strategies to indicate when the checkpoints can be removed without prejudice to the simulation. The techniques and strategies will be implemented in Distributed Co-simulation Backbone (DCB) in order to perform experiments to evaluate the performance and usefulness of the results according to the proposed objective.Modelos de simula??o distribu?da que possuem componentes ass?ncronos est?o sujeitos a retrocesso no tempo causados por viola??o de tempo. Checkpoints s?o utilizados para restaura??o de estados consistentes anteriores ? viola??o de tempo. Ao longo da simula??o os componentes podem gerar checkpoints in?teis em caso de retrocesso. Em simula??es grandes esses checkpoints in?teis ocupam cada vez mais mem?ria, e a falta de um armazenamento limitado desses checkpoints pode levar a simula??o a um colapso por falta de mem?ria. O objetivo deste trabalho ? apresentar algumas t?cnicas de limita??o do espa?o de armazenamento de checkpoints e algumas estrat?gias para indicar quando os checkpoints podem ser removidos sem preju?zo para a simula??o. As t?cnicas e estrat?gias ser?o implementadas no DCB (Distributed Co-simulation Backbone) a fim de fazer experimentos para avaliar o desempenho e a utilidade dos resultados de acordo com o objetivo proposto

A study of simulation performance based on event orderings

Master'sMASTER OF SCIENC