Um Ambiente de Simulação de Fluido para Redes Multimídia

Kelvin F. ReinhardtEdmundo de Souza e SilvaRosa M. M. Leão

An important issue to solve computer network models using traditional simulation methods is the computational cost to obtain the measures of interest. This is due to the very large number of events that have to be executed till the model reaches steady state. To reduce the simulation costs new techniques have been developed in the last few years. One of the most promising techniques is fluid simulation. In this technique, instead of representing the individual packets in the network, the traffic is viewed as a fluid that flows through a series of reservoirs. Therefore, events associated with the arrival and departure of packets to and from routers are not explicitly executed. Instead, only the resulting actions from changes in arrival and departure rates are executed and the equations that govern the changes in the fluid levels in each reservoir are solved. This can speed up the simulation time to solve a model. In this work, a fluid modeling paradigm based on rate rewards is devised. The paradigm was implemented in a fluid simulator for computer networks. The fluid simulator was built over the TANGRAM-II simulator and as such several new features were added to handle fluids. The new fluid simulator inherited all the facilities and the power of the TANGRAM-II tool. It is generic enough to model complex systems and yet hides the complex fluid equations from the end user.

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