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Master's Dissertation
Full name
Ricardo Nogueira de Figueiredo
Knowledge Area
Date of Defense
São Carlos, 2011
Santana, Marcos José (President)
Hirata, Celso Massaki
Wolf, Denis Fernando
Title in Portuguese
Avaliação de algoritmos de controle de congestionamento como controle de admissão em um modelo de servidores web com diferenciação de serviços
Keywords in Portuguese
Algoritmos de controle de congestionamento
Qualidade de serviço
Servidor Web
Abstract in Portuguese
Esta dissertação apresenta a construção de um protótipo de servidor Web distribuído, baseado no modelo de servidor Web com diferenciação de serviços (SWDS) e a implementação e avaliação de algoritmos de seleção, utilizando o conceito de controle de congestionamento para requisições HTTP. Com isso, além de implementar uma plataforma de testes, este trabalho também avalia o comportamento de dois algoritmos de controle de congestionamento. Os dois algoritmos estudados são chamados de Drop Tail e RED (Random Early Detection), no qual são bastante difundidos na literatura científica e aplicados em redes de computadores. Os resultados obtidos demostram que, apesar das particularidades de cada algoritmo, existe uma grande relação entre tempo de resposta e a quantidade de requisições aceitas
Title in English
Evaluation of congestion control algorithms used as control admission in a model of web servers with service differentiation
Keywords in English
Algorithms of congestion control
Quality of service
Web server
Abstract in English
This MSc dissertation presents the implementation of a prototype for a distributed web server based on the SWDS, a model for a web server with service differentiation, and the implementation and evaluation of selection algorithms adopting the concept of congestion control for HTTP requests. Thus, besides implementing a test platform this work also evaluates the behavior of two congestion control algorithms. The two algorithms studied are the Drop Tail and the RED (Random Early Detection), which are frequently discussed in the scientific literature and widely applied in computer networks. The results obtained show that, although the particularities of each algorithm, there is a strong relation between the response times and the amount of requests accepted in the server
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