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Quality-of-Service (QoS) aware service selectionproblems are a crucial issue in both Grids and distributed, service-oriented systems. When several implementations perservice exist, one has to be selected for each workflow step. Several heuristics have been proposed, including blackboardand genetic algorithms. Their applicability and performancehas already been assessed for static systems. In order...
Cloud computing is a novel computing paradigm that offers data, software, and hardware services in a manner similar to traditional utilities such as water, electricity, and telephony. Usually, in Cloud and Grid computing, contracts between traders are established using Service Level Agreements (SLAs), which include objectives of service usage. However, due to the rapidly growing number of service...
Companies are currently turning to the use of web applications offered as Cloud services, expecting a certain QoS expressed by means of a maximum response time. Virtual Machines hosting these applications may vary their resource allotment as a consequence of a variation in the incoming workload intensity to guarantee the agreed response time. This allotment should be enough to avoid an under-provision...
Monitoring of infrastructural resources in clouds plays a crucial role in providing application guarantees like performance, availability, and security. Monitoring is crucial from two perspectives - the cloud-user and the service provider. The cloud user's interest is in doing an analysis to arrive at appropriate Service-level agreement (SLA) demands and thecloud provider's interest is to assess if...
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