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In this paper, we present generic cloud performance models for evaluating Iaas, PaaS, SaaS, and mashup or hybrid clouds. We test clouds with real-life benchmark programs and propose some new performance metrics. Our benchmark experiments are conducted mainly on IaaS cloud platforms over scale-out and scale-up workloads. Cloud benchmarking results are analyzed with the efficiency, elasticity, QoS,...
An elastic cloud provisions machine instances upon user demand. Auto-scaling, scale-out, scale-up, or any mixture techniques are used to reconfigure the user cluster as workload changes. We evaluate three scaling strategies to upgrade the performance, efficiency and productivity of elastic clouds like EC2, Rack space, etc. We developed new performance models and run the Hi Bench benchmark to test...
With the rapid advance of mobile computing technology and wireless networking, there is a significant increase of mobile subscriptions. This drives a strong demand for development and validation of mobile APPs and SaaS applications on mobile web. This paper is written to offer informative and insightful discussion about mobile testing-as-a-service (MTaaS), including its basic concepts, motivations,...
To achieve large scale reuse and economy of scale, software are wrapped into services and migrated to the cloud platform. As a result, the quality of software services are affected by many third party components such as infrastructure services and platform services. In the collaborative framework, the stake-holders may have distinct, even contradictive, quality objectives. It is necessary to build...
A QoS (Quality of Service) contract is an agreement between the web service provider and the web service user that specifies the level of service quality. Web service users can be assured of the level of the service quality specified by the QoS contract. A quality management system is used to enforce QoS contracts.The QoS management system supports various management functions such as the creation...
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