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Vers l'Auto-Optimisation dans les Systèmes Autonomes.

Abstract : The increasing complexity of computer systems makes their administration even more tedious and error-prone. A general approach to this problem consists in building autonomic systems that are able to manage themselves and to handle changes of their state and their environment. While energy becomes even more scarce and expensive, the optimization of computer systems is an essential management field to improve their performance and to reduce their energetic footprint. As huge energy consumers, current computer systems are usually statically configured and behave badly in response to changes of their environment, and especially to changes of their workload. Self-optimization appears as a promising approach to these problems as it endows these systems with the ability to improve their own performance in an autonomous manner. This thesis focus on algorithms and techniques to implement self-optimized autonomic systems. We specifically study self-optimization algorithms that rely on dynamic system provisioning in order to improve their performance and their resources' efficiency. In the context of the Jade prototype of a component-based autonomic management platform, we propose best-effort algorithms that improve the performance of the managed systems through dynamic adaptations of the systems in response to gradual or sudden changes of their workload. We show the efficiency of these algorithms on Internet services and on messages services submitted to changing workloads. Finally, in order to guarantee optimal performance, we propose an optimization policy relying on the modeling of the managed system so as to generate optimal configurations. This policy is evaluated on a monitoring service for distributed systems. The implementation of autonomic management policies raised a number of challenges : the system is required to support dynamic adaptions, to observe itself and to take actions on itself. We address these needs with the Oz programming language and its distributed platform Mozart to implement the FructOz framework dedicated to the construction and handling of complex dynamic and distributed architecture-based systems, and the LactOz library specialized in the querying and browsing of dynamic architectures. Combining FructOz and LactOz, we show how to build complex dynamic systems involving distributed deployments as well as high levels of synchronizations and parameters.
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https://tel.archives-ouvertes.fr/tel-00540554
Contributor : Christophe Taton <>
Submitted on : Saturday, November 27, 2010 - 1:54:36 PM
Last modification on : Thursday, November 19, 2020 - 12:59:40 PM
Long-term archiving on: : Friday, October 26, 2012 - 5:01:01 PM

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Christophe Taton. Vers l'Auto-Optimisation dans les Systèmes Autonomes.. Réseaux et télécommunications [cs.NI]. Institut National Polytechnique de Grenoble - INPG, 2008. Français. ⟨tel-00540554⟩

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