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With the advance of the Cloud Computing paradigm, a single service offered by a cloud platform may not be enough to meet all the application requirements. To fulfill such requirements, it may be necessary, instead of a single service, a composition of services that aggregates services provided by different cloud platforms. In this perspective, this work presents Cloud Integrator, a middleware platform...
This paper describes an approach for identification of internal web server system anomalies affecting the quality of service. We assume that the problems are due to system resource starvation. We observe the response time of a web server while under various artificial workload. Simultaneously we collect data on several system resource parameters. Supervised machine learning based on regularization...
Nowadays, cloud computing is considered as a new charming technology, where new opportunities in ICT world are becoming real. Cloud is appealing many IT companies, but the largest business is in hand of big cloud operators. In the near future the scenario could change, and becoming much more complex even involving small and medium providers. Cloud operators could collaborate to satisfy the increasing...
The emergence of cloud computing infrastructures brings new ways to build and manage computing systems, with the flexibility offered by virtualization technologies. In this context, this PhD thesis focuses on two principal objectives. First, leveraging virtualization and cloud computing infrastructures to build distributed large scale computing platforms from multiple cloud providers, allowing to...
Cloud computing is a paradigm for enabling remote, on-demand access to a set of configurable computing resources as a service. The pay-per-use model enables service providers to offer their services to customers in different Quality-of-Service (QoS) levels. These QoS parameters are used to compose some bipartisan Service Level Agreement (SLA) between a service provider and a service consumer. A main...
Cloud computing is considered a booming trend in the world of information technology which depends on the idea of computing on demand. Cloud computing platform is a set of scalable data servers, providing computing and storage services. The cloud storage is a relatively basic and widely applied service which can provide users with stable, massive data storage space. Our research concerns with searching...
Cloud Computing is a powerful and flexible software environment, which delegates the material's management and in which users pay as they go. The migration of enterprise applications on the Cloud is increasing. Most of these applications are available with a standardized access to the business logic through Internet. However, the current cloud offers is not always complying with users' needs. For...
The desire for ubiquitous, seamless and resilient access to content and services builds up momentum for cutting edge technologies such as cooperative transmission, autonomic communications and cloud networking. Cooperative transmission, being one of the hottest research topics recently, capitalises on the exploitation of orthogonal resource in the spatio-temporal domain to provide diversity through...
The evolution of the Next Generation Networks, especially the wireless broadband access technologies such as Long Term Evolution (LTE) and Worldwide Interoperability for Microwave Access (WiMAX), have increased the number of "all-IP" networks across the world. The enhanced capabilities of these access networks has spearheaded the cloud computing paradigm, where the end-users aim at having...
Virtualization is emerging as a key mechanism of scaling the infrastructure and facilitating service deployment for future Internet. Network virtualization provides the ability to slice larger, underutilized physical nodes into smaller, virtual ones. To ensure deterministic performance, guaranteed QoS, and independent behavior, virtual nodes have to be properly isolated. However, a high isolation...
Cloud Computing offers application developers an abstract view of computational resources that can be provisioned on demand over a computer network. This model allows organizations to concentrate on the applications needed to support their core business, instead of having to manage the infrastructure required to run those applications. Yet, even though this approach promises very compelling benefits,...
In this paper, we report on the results of numerical experiments in the field of computational fluid dynamics (CFD) on Amazon's HPC cloud. To this end, we benchmarked our MPI-parallel fluid solver NaSt3DGPF on several HPC compute nodes of the cloud system. Our solver can use CPUs and GPUs to calculate the simulation results. With a pre-requested number of instances we observe for both, CPUs and GPUs,...
In this article we describe an approach for autonomic management of legacy software in distributed environments (cluster, grid or cloud). Our propositions have been implemented in a tool (TUNe) based on diagrams formalisms. We describe particularly the property of self-Protecting. The various mechanisms needed to maintain the consistency of the managed system, are described: autonomic creation or...
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