Desempenho em ambiente Web considerando diferenciação de serviços (QoS) em cache, rede e servidor: modelagem e simulação / Performance in Web environments with differentiation of service (QoS) in caches, network and server: modeling and simutation

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

This PhD thesis presents the investigation of alternatives to improve the performance of Web environments by evaluating the impact of using differentiated service mechanisms in all points of the system. Several scenarios were created and modeled in the OPNET Modeler, with different configurations of both differentiated services and network overloading. A special cache server supporting differentiated services (CDF cache) was proposed and included in the model, comprising one of the major contributions of this work once it positively complements the differentiated service scenario, making that the gains obtained with other stages of the system do not be spoiled when using the cache. The main results obtained show that the adoption of differentiated services in isolated parts of the system cannot generate the expected performance gains. The features of all the equipments considered in the several scenarios defined in this work are very close to the reality and the models used in the OPNET were evaluated and validated by the companies that produce those equipments. Thus, the models that implement the scenarios considered in this work also comprises an important contribution of this thesis, once the study presented is not just a theoretical modeling exercise but, conversely, it approaches aspects very close to the reality, comprising a possible Web system management support

ASSUNTO(S)

differentiation of services qualidade de serviços quality of service servidor cache web web cache server diferenciação de serviços

ACESSO AO ARTIGO

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