P117 - GSEM 2007 - 4th Intenational Conference on Grid Service Engineering and Management
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- KonferenzbeitragTowards Adaptive Management of QoS-aware Service Compositions - Execution Strategies(Grid service engineering and management – the 4th international conference on grid service engineering and management – GSEM 2007, 2007) Momotko, Mariusz; Gajewski, Michał; Ludwig, André; Kowalczyk, Ryszard; Kowalkiewicz, Marek; Zhang, Jian YingService compositions enable users to realize their complex needs as a single request. Despite intensive research, especially in the area of business processes, web services and grids, an open and valid question is still how to manage service compositions in order to satisfy both functional and non-functional requirements as well as adapt to dynamic changes. In this paper we describe an approach towards adaptive management of QoS-aware service compositions. This approach integrates well known concepts and techniques and proposes various execution strategies based on dynamic selection and negotiation of services, contracting based on service level agreements, service enactment with flexible support for exception handling, monitoring of service level objectives, and profiling of execution data.
- KonferenzbeitragUsing Continuations for Flexible Provision of Grid Services(Grid service engineering and management – the 4th international conference on grid service engineering and management – GSEM 2007, 2007) Giordano, Maurizio; Napoli, Claudia diThe main challenge of grid computing is to provide a unified computational infrastructure composed of networked heterogeneous resources that makes effective use of the computational power delivered by each resource. To reach this objective management of computational resources is a crucial aspect because of the decentralized, heterogeneous and autonomous nature of these resources that usually belong to different administrative domains. As such they cannot be managed by adopting a centralized approach, but more sophisticated computing methodologies are necessary. In this context, the possibility to manage the execution of services is advisable to control their provision in dynamic and changing environments. In the present work an infrastructure to model service providers is proposed to allow for flexible provision of grid services, i.e. to allow providers to dynamically adapt the execution of services according to both the changing conditions of the environment where they operate in, and the requirements of service users. The infrastructure is based on continuations, a programming paradigm that allows to control the state of code execution at programming level without directly using operating system facilities.
- KonferenzbeitragTowards Collaborative Service Level Agreement Negotiation(Grid service engineering and management – the 4th international conference on grid service engineering and management – GSEM 2007, 2007) He, Qiang; Yan, Jun; Yang, Yun; Kowalczyk, Ryszard; Jin, HaiA critical issue in the Service Level Agreement management for service composition is to control the relationship between the composite service and the component services in the negotiation. However, existing approaches are inefficient. This paper presents a novel agent-based collaborative approach to address this problem. We introduce a negotiation protocol, under which the agents on the service providers’ side collaborate by exchanging information with each other to gain global knowledge of the negotiation. The collaboration can facilitate the progress of the negotiation. We also discuss the corresponding impact on the decision making strategies.
- KonferenzbeitragFIFO Queuing of Constant Length Fully Synchronous Jobs(Grid service engineering and management – the 4th international conference on grid service engineering and management – GSEM 2007, 2007) Berten, Vandy; Devillers, Raymond; Louchard, GuyThe paper examines the behaviour of a saturated multipro- cessor system to which fully synchronous parallel jobs are submitted. In order to simplify the analysis, we assume constant length jobs, a non-preemptive scheduling and a FIFO queue. We determine in particular the number of used CPUs.
- KonferenzbeitragAnt Colony System Based Algorithm for QoS-Aware Web Service Selection(Grid service engineering and management – the 4th international conference on grid service engineering and management – GSEM 2007, 2007) Zheng, Xiao; Luo, Jun-Zhou; Song, Ai-BoQoS-aware service selection is an active area of research on Web services composition. It is a complex combinatorial optimization problem, which solves how to find a best composition plan that maximizes user QoS requirement. This paper presents a QoS-aware Web service selection algorithm based on Ant Colony System. Firstly, a proposed Web Services Composition graph (WSC graph) is applied to model the composition problem. Then an extended Ant Colony System using a novel Ant clone rule is applied to solve the selection problem. In order to quicken the speed of its convergence, the utility function is considered as the heuristic information. Finally, the algorithm is tested for the performance.
- Konferenzbeitrage-Portfolio, an auto-adaptable grid service with components using Peer-to-Peer agents(Grid service engineering and management – the 4th international conference on grid service engineering and management – GSEM 2007, 2007) Lacouture, Jérôme; Mansour, SaberThe new trends for long-life training and social activities emphasize on qualification of competence. Our objective is to improve Vocational and Educational Training and specially the process of informal learning by mixing these requirements and new technologies like Grid Computing. The European Learning Grid Infrastructure-ELeGI-project proposes to provide an architecture and some services to promote formal and informal learning on the Grid. In this context, the e-Qualification process is our solution to feature informal acquisitions during training sessions on the Grid. To each individual is associated an e-Portfolio service where are reported his activities, knowledge, competencies and objectives. In this paper, we insist on the dynamic character of the training and we propose some ways for the adaptation and composition of dynamic grid services between users. Our approach is situated at the convergence of components and agents paradigms, components producing adaptable grid services and agents dynamically composing them. Our flexible approach is not limited to the area of learning.It is also applicable to others similar grid applications.
- KonferenzbeitragGeographic Grid-Computing and HPC empowering Dynamical Visualisation for Geoscientific Information Systems(Grid service engineering and management – the 4th international conference on grid service engineering and management – GSEM 2007, 2007) Rückemann, Claus-PeterThis paper gives an overview of the potential of the cur- rent implementation of portable components for Geoscientific Information Systems (GIS) within the GISIG actmap-project. The computing problems addressed are multifold and for the first time presented here: With Active Source having extended the framework for conventional GIS, new features have been enabled like the use of Grid Computing and clus- ter resources, dynamical visualisation, and High Performance Computing (HPC) in order to be used for Geographic Grid Computing. Base of scientific content can for example be geophysical information like environmental or seismological data, geographical and spatial information using Geographic Data Infrastructures (GDI), as well as data from industrial, economic, cultural, and social sources. An integrated solution for moni- toring, accounting, billing supporting the geo-information market can be incorporated into this context. An outlook is given for Geographic Grid Computing e.g. for the extended use of Web Services and GDI in the future.
- KonferenzbeitragApplication Specification Language (ASL) – A Language for Describing Applications in Grid Computing(Grid service engineering and management – the 4th international conference on grid service engineering and management – GSEM 2007, 2007) Afgan, Enis; Bangalore, PurushothamGrid computing is the computing infrastructure of the next century where unlimited hardware and software resources are delivered to user’s fingertips. Much of the power delivered by grid computing is realized through application software made readily available to its users. The process of application deployment and deliverance to the end-users though is perplexed with options and requirements not readily available to application deployers. In this paper, we present a new grid language called Application Specification Language (ASL), which allows application developers to describe their individual applications. Application descriptions include general application information, installation requirements, invocation requirements, as well as any additional hints or suggestions that are applicable for the application. We present an ASL schema and provide examples of language use showing how adoption of ASL alleviates some of the deployment and runtime difficulties.
- KonferenzbeitragKeynote Speaker e-Infrastructures for e-Science(Grid service engineering and management – the 4th international conference on grid service engineering and management – GSEM 2007, 2007) Gentzsch, WolfgangNowadays, proprietary and monolithic IT environments are more and more transformed into standard- and component-based service infrastructures. In this keynote, we will analyse this trend especially for the area of e-Science. While in the past decades, scientist have developed centralised, application-focused (silo-oriented) hardware and software environments, they now (for good reasons) tend to join forces in building and operating general-purpose, networked, distributed compute and data grids, recently called e-Infrastructures. This trend is enabled by grand technology progress towards reusable, decomposable, service-oriented software architectures and standard off-the-shelf hardware, among others. However, it is still challenging to design, build, and operate such complex infrastructures for e-Science. Therefore, we have analysed several major (grid) infrastructure projects around the world (such as TeraGrid in the US, NAREGI in Japan, the e-Science Initiative in the UK, and DEISA and EGEE in Europe) for the sole purpose of extracting their lessons learned and valuable recommendations to be followed while designing, building, and operating our own German D-Grid infrastructure and user and provider communities. This keynote will present these findings combined with our own lessons learned. A catalogue of recommendations for those interesting in building similar e-infrastructures will conclude this presentation.