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The orientation towards web service technology gives a raise to huge number of functionally similar web services. Hence, quality of service is becoming more important and even essential in web service technology as a distinctive criterion. Generally providers have sufficient information about the really provided quality, however, clients don't. Service level agreements that define the relationship...
Virtualization allows us to consolidate multiple servers onto a single physical machine, saving infrastructure cost. Yet, consolidation can lead to performance degradation, jeopardizing Service Level Agreement (SLA). In this paper, we analyze and identify the factors to the performance degradation due to consolidation — that is the wait time and the ready time. The wait time is the queuing time caused...
Finding an appropriate Web service is the best chance due to lack of semantics in the protocols used to specify and publish them. UDDI and WSDL do not provide grounds to find appropriate web services at the required accuracy and Quality of Service (QoS). This article discusses a Semantic Search Agent (SSA) approach that discovers appropriate web services according to their semantic description. QoS...
The essential services such as banking, transportation, medicine, education and defense are being progressively replaced by cheaper and more efficient Internet-based web applications. Therefore, the availability of Web services is very critical for the socio-economic growth of the society. Distributed denial-of-service (DDoS) attacks pose an immense threat to the availability of these services. The...
Transient overload is a short term event characterized by a sudden and unexpected rise of the arrival rate in a Web server. Transient overload events in Web servers have been observed more frequently as the number of Internet users grows and the Web services become more popular. This paper deals with the non-trivial problem of generating overload for Web server testing. In this paper we present a...
We propose a dynamic mechanism, thread count adaptation, that adjusts the thread counts that are allocated to services for adapting to CPU requirement variations in SMP environments. Our goal is to increase the maximum throughput available on a system that has multiple dynamic content services while meeting different service time criteria for these services in dynamic workloads. Our challenge is to...
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