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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Um estudo sobre interrupÃÃo e reiniciabilidade de processos em clusters de servidores web / A study on process interruption and restart in clusters of web server

PitÃgoras GraÃa Martins 13 July 2006 (has links)
WS-DSAC à uma plataforma desenvolvida sob um cluster de servidores Web com balanceamento de cargas capaz de realizar o controle de admissÃo e diferenciaÃÃo de serviÃos para permitir a diferenciaÃÃo da QoS oferecida aos clientes e utilizar de forma eficaz os recursos disponÃveis. Quando requisiÃÃes em excesso sÃo enviadas para o cluster, o sistema se torna "saturado". Isto significa que o mecanismo de controle de admissÃo nÃo à mais capaz de manter o tempo de resposta necessÃrio para que se possa garantir a qualidade de serviÃo do sistema como um todo. Neste trabalho à apresentado um mecanismo que utiliza o conceito de interrupÃÃo e reativaÃÃo de processos para otimizar a capacidade de processamento do sistema com a finalidade de evitar o problema da "saturaÃÃo". Este mecanismo interrompe apenas os processos que podem ocasionar sobrecarga do servidor e reinicializando-os posteriormente quando a carga do servidor volta a melhores condiÃÃes de processamento. Desta forma, à possÃvel aumentar o nÃmero de requisiÃÃes privilegiadas Ãs expensas de outros serviÃos que podem esperar, diminuindo tambÃm nÃmero de requisiÃÃes nÃo atendidas. / With the expansion of services offered through the Internet and the popularization of the Web technology in the modern world, the toughest problems Web server administrators face are how to dimension infrastructure and how to manage the high workload during intense processing moments. As a result, we have websites with extremely high response times, due to bad resource management. This paper presents a mechanism of high availability for services and process management, for the optimization of server capacity, through a technique called process interruption and restart. The interruption and restart technique was employed to enable services to be available even through high workload moments. The restarts have three important advantages. First, it either makes a process go back to its initial state or become immune to problems. Second, the restarts have the property of increasing system reliability. The suspension and restart technique is utilized to control resource consumption under heavy processing workload. Another advantage is that restarting is a simple mechanism, easy to implement and retrieve. This has created the possibility of creating a new layer that allows better process management under severe workloads. It provides better machine performance, lower response time, and greater service availability, in addition to meeting SLA needs â QoS contracts.

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