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An adaptive admission control and load balancing algorithm for a QoS-aware Web system

Identificadores del recurso

9788469298015

http://www.tdx.cat/TDX-1211109-113725

http://hdl.handle.net/10803/9413

Procedència

(Tesis de la Universitat de les Illes Balears)

Fitxa

Títol:: An adaptive admission control and load balancing algorithm for a QoS-aware Web system
Tema:: Performance Evaluation; Monitoring; Overloaded Web Server; Load Balancing; Resource Allocation; Admission Control; Simulation; Arquitectura i Tecnologia de Computadors; 51
Descripció:: The main objective of this thesis focuses on the design of an adaptive algorithm for admission control and content-aware load balancing for Web traffic. In order to set the context of this work, several reviews are included to introduce the reader in the background concepts of Web load balancing, admission control and the Internet traffic characteristics that may affect the good performance of a Web site.
The admission control and load balancing algorithm described in this thesis manages the distribution of traffic to a Web cluster based on QoS requirements.
The goal of the proposed scheduling algorithm is to avoid situations in which the system provides a lower performance than desired due to servers' congestion. This is achieved through the implementation of forecasting calculations.
Obviously, the increase of the computational cost of the algorithm results in some overhead. This is the reason for designing an adaptive time slot scheduling that sets the execution times of the algorithm depending on the burstiness that is arriving to the system.
Therefore, the predictive scheduling algorithm proposed includes an adaptive overhead control.
Once defined the scheduling of the algorithm, we design the admission control module based on throughput predictions. The results obtained by several throughput predictors are compared and one of them is selected to be included in our algorithm. The utilisation level that the Web servers will have in the near future is also forecasted and reserved for each service depending on the Service Level Agreement (SLA).
Our load balancing strategy is based on a classical policy. Hence, a comparison of several classical load balancing policies is also included in order to know which of them better fits our algorithm. A simulation model has been designed to obtain the results presented in this thesis.
Font:: TDX (Tesis Doctorals en Xarxa)
Idioma:: English
Autor/Productor:: Gilly de la Sierra-Llamazares, Katja
Editor:: Universitat de les Illes Balears
Otros colaboradores/productores:: Juiz, Carlos; Universitat de les Illes Balears. Departament de Ciències Matemàtiques i Informàtica
Drets:: ADVERTIMENT. L'accés als continguts d'aquesta tesi doctoral i la seva utilització ha de respectar els drets de la persona autora. Pot ser utilitzada per a consulta o estudi personal, així com en activitats o materials d'investigació i docència en els termes establerts a l'art. 32 del Text Refós de la Llei de Propietat Intel·lectual (RDL 1/1996). Per altres utilitzacions es requereix l'autorització prèvia i expressa de la persona autora. En qualsevol cas, en la utilització dels seus continguts caldrà indicar de forma clara el nom i cognoms de la persona autora i el títol de la tesi doctoral. No s'autoritza la seva reproducció o altres formes d'explotació efectuades amb finalitats de lucre ni la seva comunicació pública des d'un lloc aliè al servei TDX. Tampoc s'autoritza la presentació del seu contingut en una finestra o marc aliè a TDX (framing). Aquesta reserva de drets afecta tant als continguts de la tesi com als seus resums i índexs.; info:eu-repo/semantics/openAccess
Data:: 2009-11-16
Tipo de recurso:: info:eu-repo/semantics/doctoralThesis; info:eu-repo/semantics/publishedVersion
Format:: application/pdf

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15. <dc:subject>Performance Evaluation</dc:subject>
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17. <dc:subject>Overloaded Web Server</dc:subject>
18. <dc:subject>Load Balancing</dc:subject>
19. <dc:subject>Resource Allocation</dc:subject>
20. <dc:subject>Admission Control</dc:subject>
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