Avaliação Experimental de Protocolos de Multicast Confiável: um choque de realidade

Marinho Barcellos

Although reliable multicast has been extensively addressed in the literature, and its benefits widely recognized, its applications are still limited and little is known about their actual performance. Historically, new reliable multicast mechanisms and protocols have been evaluated using analysis and simulation. In contrast to previous work, this paper presents results derived from an extensive experimental evaluation with the state-of-the-art protocol implementations, in production networks. The evaluation focuses on data-intensive Grid Computing applications, which exchange large amounts of data but typically require small groups. The scenarios employed include a Wide-Area Network, using protocols both with and without congestion control (adaptive and fixed rate, respectively). The results are somewhat surprising, and represent a reality shock in terms of previous research in the area.

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