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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the Physical Activity for Health Group based within the School of Psychological Sciences & Health. Research here seeks to better understand how and why physical activity improves health, gain a better understanding of the amount, intensity, and type of physical activity needed for health benefits, and evaluate the effect of interventions to promote physical activity.

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A framework for performance monitoring, load balancing, adaptive timeouts and quality of service in digital libraries

Kapidakis, S. and Terzis, S. and Sairamesh, J. (2000) A framework for performance monitoring, load balancing, adaptive timeouts and quality of service in digital libraries. International Journal on Digital Libraries, 3 (1). pp. 19-35. ISSN 1432-5012

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Abstract

In this paper, we investigate the issues of performance management in large scale, autonomous and federated digital library systems, performing the tasks of indexing, searching and retrieval of information objects. We have defined a management architecture and performance framework for measuring and monitoring the behavior of digital libraries as they operate. Our architecture and mechanisms are easily applicable to other digital library systems of similar flavor and architecture. We implemented this architecture over a testbed of Dienst servers using real data and workload from the operational NCSTRL system. We have defined the relevant parameters for investigating the performance of the servers and have developed visualization tools to monitor the parameters. In addition, our performance framework provides mechanisms for load-balancing search requests in a network of digital library servers. We have demonstrated this by building a testbed for investigating a few novel load balancing policies. Given that network delays and outages are unpredictable over the Internet, we have developed new adaptive mechanisms to detect timeouts and provide quality of service.