Now showing items 1-20 of 57

    • A hybrid web server architecture for secure e-business web applications 

      Beltran Querol, Vicenç; Carrera Pérez, David; Guitart Fernández, Jordi; Torres Viñals, Jordi; Ayguadé Parra, Eduard (2005-09)
      Article
      Restricted access - publisher's policy
      Nowadays the success of many e-commerce applications, such as on-line banking, depends on their reliability, robustness and security. Designing a web server architecture that keeps these properties under high loads is a ...
    • A methodology for full-system power modeling in heterogeneous data centers 

      Canuto, Mauro; Bosch, Raimon; Macías Lloret, Mario; Guitart Fernández, Jordi (Association for Computing Machinery (ACM), 2016)
      Conference lecture
      Open Access
      The need for energy-awareness in current data centers has encouraged the use of power modeling to estimate their power consumption. However, existing models present noticeable limitations, which make them application-dependent, ...
    • A non-additive negotiation model for utility computing markets 

      Macías Lloret, Mario; Guitart Fernández, Jordi (2009-09)
      Conference report
      Open Access
      Market-based resource allocation is a promising model for dealing with the growing Utility Computing environments, such as Grid or Cloud Computing. Agents that represent both service clients and providers meet in a market ...
    • A risk assessment framework for cloud computing 

      Djemame, Karim; Armstrong, Django; Guitart Fernández, Jordi; Macías Lloret, Mario (Institute of Electrical and Electronics Engineers (IEEE), 2016-07-01)
      Article
      Open Access
      Cloud service providers offer access to their resources through formal service level agreements (SLA), and need well-balanced infrastructures so that they can maximise the quality of service (QoS) they offer and minimise ...
    • A Survey on Performance Management for Internet Applications 

      Guitart Fernández, Jordi; Torres Viñals, Jordi; Ayguadé Parra, Eduard (2010-01-01)
      Article
      Restricted access - publisher's policy
      Internet applications have become indispensable for many business and personal processes, turning the performance of these applications into a key issue. For this reason, recent research has comprehensively explored ...
    • Addressing the use of cloud computing for web hosting providers 

      Fitó, Josep Oriol; Guitart Fernández, Jordi (2009-09)
      Conference report
      Open Access
      Nobody doubts about cloud computing is and will be a sea change for the Information Tech nology. Specifically, we address an application of this emerging paradigm into the web hosting providers. We create the Cloud Hosting ...
    • An architecture for automatic ML/AI workflow management and supervision 

      Liu, Peini; Guitart Fernández, Jordi (Barcelona Supercomputing Center, 2021-05)
      Conference report
      Open Access
      Scientific computation problems have been faced with the need to analyze increasing amounts of data as part of their application workflows, and the science-based model is being combined with big data and machine learning ...
    • Analysis of a trust model for SLA negotiation and enforcement in cloud markets 

      Macías Lloret, Mario; Guitart Fernández, Jordi (Elsevier, 2016-02)
      Article
      Open Access
      Online Reputation Systems help mitigate the information asymmetry between clients and providers in Cloud Computing Markets. However, those systems raise two main drawbacks: the disagreement for assuming the cost of ownership ...
    • ASCETiC: adapting service lifeCycle towards efficienT clouds 

      Juan Ferrer, Ana; Garcia Perez, David; Agiatzidou, Eleni; Lordan Gomis, Francesc-Josep; Ejarque, Jorge; Sirvent, Raul; Badia Sala, Rosa Maria; Guitart Fernández, Jordi; Ortiz, David; Macías Lloret, Mario; Deprez, Jean-Christophe; Ponsard, Christophe; Temporale, Christian; Panuccio, Pasquale; Sommacampagna, Davide; Blasi, Lorenzo; Djemame, Karim; Armstrong, Django; Kammer, Michael (SCITEPRESS, 2014-04)
      Part of book or chapter of book
      Restricted access - publisher's policy
      Reducing energy consumption is increasingly gaining attention in the area of Cloud computing, as means to reduce costs and improve corporate sustainability image. ASCETiC is focused on providing novel methods and tools to ...
    • Assessing and forecasting energy efficiency on cloud computing platforms 

      Subirats, Josep; Guitart Fernández, Jordi (Elsevier, 2015-04)
      Article
      Restricted access - publisher's policy
    • Big data deployment in containerized infrastructures through the interconnection of network namespaces 

      Sauvanaud, Carla; Dholakia, Ajay; Guitart Fernández, Jordi; Kim, Chulho; Mayes, Peter (2020-01-27)
      Article
      Open Access
      Big Data applications tackle the challenge of fast handling of large streams of data. Their performance is not only dependent on the data frameworks implementation and the underlying hardware but also on the deployment ...
    • BSC contributions in energy-aware resource management for large scale distributed systems 

      Valero Cortés, Mateo; Torres Viñals, Jordi; Ayguadé Parra, Eduard; Carrera Pérez, David; Guitart Fernández, Jordi; Beltran Querol, Vicenç; Becerra Fontal, Yolanda; Badia Sala, Rosa Maria; Labarta Mancho, Jesús José (2010)
      Conference report
      Open Access
      This paper introduces the work being carried out at Barcelona Supercomputing Center in the area of Green Computing. We have been working in resource management for a long time and recently we included the energy parameter ...
    • Characterizing cloud federation for enhancing providers' profit 

      Goiri Presa, Íñigo; Guitart Fernández, Jordi; Torres Viñals, Jordi (IEEE Computer Society Publications, 2010)
      Conference report
      Open Access
      Cloud federation has been proposed as a new paradigm that allows providers to avoid the limitation of owning only a restricted amount of resources, which forces them to reject new customers when they have not enough local ...
    • Checkpoint-based Fault-tolerant Infrastructure for Virtualized Service Providers 

      Goiri Presa, Íñigo; Julià, Ferran; Guitart Fernández, Jordi; Torres Viñals, Jordi (IEEE Computer Society Publications, 2010-04-23)
      Conference report
      Open Access
      Crash and omission failures are common in service providers: a disk can break down or a link can fail anytime. In addition, the probability of a node failure increases with the number of nodes. Apart from reducing the ...
    • Client classification policies for SLA negotiation and allocation in shared cloud datacenters 

      Macías Lloret, Mario; Guitart Fernández, Jordi (Springer, 2011)
      Conference report
      Open Access
      In Utility Computing business model, the owners of the computing resources negotiate with their potential clients to sell computing power. The terms of the Quality of Service (QoS) to be provided as well as the economic ...
    • Deadline constrained prediction of job resource requirements to manage high-level SLAs for SaaS cloud providers 

      Reig Ventura, Gemma; Alonso López, Javier; Guitart Fernández, Jordi (2010-04-28)
      External research report
      Open Access
      For a non IT expert to use services in the Cloud is more natural to negotiate the QoS with the provider in terms of service-level metrics –e.g. job deadlines– instead of resourcelevel metrics –e.g. CPU MHz. However, current ...
    • Economic model of a cloud provider operating in a federated cloud 

      Goiri Presa, Íñigo; Guitart Fernández, Jordi; Torres Viñals, Jordi (2012-09)
      Article
      Restricted access - publisher's policy
      Resource provisioning in Cloud providers is a challenge because of the high variability of load over time. On the one hand, the providers can serve most of the requests owning only a restricted amount of resources, but ...
    • Elastic management of tasks in virtualized environments 

      Goiri Presa, Íñigo; Guitart Fernández, Jordi; Torres Viñals, Jordi (2009-09)
      Conference report
      Open Access
      Nowadays, service providers in the Cloud offer complex services ready to be used as it was a commodity like water or electricity to their customers. A key technology for this approach is virtualization which facilitates ...
    • EMOTIVE: the BSC’s engine for cloud solutions 

      Badia Sala, Rosa Maria; Goiri Presa, Íñigo; Guitart Fernández, Jordi; Macías Lloret, Mario; Torres Viñals, Jordi; Ayguadé Parra, Eduard; Ejarque, Jorge; Sirvent Pardell, Raül; Lezzi, Daniele (2009-10-01)
      Article
      Open Access
      Cloud computing is strongly based on virtualization, allowing applications to be multiplexed onto a physical resource while isolated from other applications sharing that physical resource. This technology simplifies the ...
    • Energy efficiency embedded service lifecycle: Towards an energy efficient cloud computing architecture 

      Djemame, Karim; Armstrong, Django; Kavanagh, Richard; Juan Ferrer, Ana; Garcia Perez, David; Antona, David; Deprez, Jean-Christophe; Ponsard, Christophe; Ortiz, David; Macías Lloret, Mario; Guitart Fernández, Jordi; Lordan Gomis, Francesc-Josep; Ejarque, Jorge; Sirvent Pardell, Raül; Badia Sala, Rosa Maria; Kammer, Michael; Kao, Odej; Agiatzidou, Eleni; Dimakis, Antonis; Courcoubetis, Costas; Blasi, Lorenzo (CEUR-WS.org, 2014)
      Conference report
      Open Access
      The paper argues the need to provide novel methods and tools to support software developers aiming to optimise energy efficiency and minimise the carbon footprint resulting from designing, developing, deploying and running ...