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  • Towards application deployment in community network clouds

     Selimi, Mennan; Freitag, Felix
    International Conference on Computational Science and Its Applications
    p. 614-627
    DOI: 10.1007/978-3-319-09153-2_46
    Presentation's date: 2014-06
    Presentation of work at congresses

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    Community networks are decentralized communication networks, built and operated by citizens for citizens. Most of these networks originated for enabling Internet access for under-provisioned areas. With the consolidation of cloud technology, there is now also the potential to extend the community networks towards the application level, and deploy within these networks cloud-based applications. In this paper we conduct an experimental deployment of a set of applications on cloud-based infrastructures within community networks. The aim of this study is to understand better the feasibility of running cloud-based applications in the challenging environment of these networks. For our study, we use several nodes inside of two community networks to host our applications and carry out experiments under realistic conditions. The results we obtain with deployments of ownCloud, Tahoe-LAFS and BitTorrent, are a correct functioning of the applications and a promising user experience. Our results could encourage users to contribute and participate in larger scale trials of clouds in community networks, and application developers to envision innovative services based on collective infrastructures.

  • Exploring the role of macroeconomic mechanisms in voluntary resource provisioning in community network clouds

     Khan, Muhammad Amin; Freitag, Felix
    International Symposium on Distributed Computing and Artificial Intelligence
    p. 269-278
    DOI: 10.1007/978-3-319-07593-8_32
    Presentation's date: 2014-06-04
    Presentation of work at congresses

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    Internet and communication technologies have lowered the costs of enabling individuals and communities to collaborate together. This collaboration has provided new services like user-generated content and social computing, as evident from success stories like Wikipedia. Through collaboration, collectively built infrastructures like community wireless mesh networks where users provide the communication network, have also emerged. Community networks have demonstrated successful bandwidth sharing, but have not been able to extend their collective effort to other computing resources like storage and processing. The success of cloud computing has been enabled by economies of scale and the need for elastic, flexible and on-demand provisioning of computing services. The consolidation of today's cloud technologies offers now the possibility of collectively built community clouds, building upon usergenerated content and user-provided networks towards an ecosystem of cloud services. We explore in this paper how macroeconomic mechanisms can play a role in overcoming the barriers of voluntary resource provisioning in such community clouds, by analysing the costs involved in building these services and how they give value to the participants. We indicate macroeconomic policies and how they can be implemented in community networks, to ease the uptake and ensure the sustainability of community clouds. © Springer International Publishing Switzerland 2014.

    Postprint (author’s final draft)

  • Prototyping incentive-based resource assignment for clouds in community networks

     Khan, Muhammad Amin; Buyuksahin, Umit C.; Freitag, Felix
    IEEE International Conference on Advanced Information Networking and Applications
    p. 719-726
    DOI: 10.1109/AINA.2014.88
    Presentation's date: 2014-05
    Presentation of work at congresses

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    Wireless community networks are a successful example of a collective where communities operate ICT infrastructure and provide IP connectivity based on the principle of reciprocal resource sharing of network bandwidth. This sharing, however, has not extended to computing and storage resources, resulting in very few applications and services which are currently deployed within community networks. Cloud computing, as in today's Internet, has made it common to consume resources provided by public clouds providers, but such cloud infrastructures have not materialized within community networks. We analyse in this paper socio-technical characteristics of community networks in order to derive scenarios for community clouds. Based on an architecture for such a community cloud, we implement a prototype for the incentive-driven resource assignment component, deploy it in a test bed of community network nodes, and evaluate its behaviour experimentally. Our evaluation gives insight into how the deployed prototype components regulate the consumption of cloud resources taking into account the users' contributions, and how this regulation affects the system usage. Our results suggest a further integration of this regulation component into current cloud management platforms in order to open them up for the operation of an ecosystem of community cloud.

  • Redes comunitarias y servicios cloud

     Freitag, Felix; Cerdà Alabern, Llorenç; Meseguer Pallares, Roque; Lopez Berga, Ester; Vega D'Aurelio, Davide; Dimogerontakis, Emmanouil; Gallardo Gomez, Antonia; Rameshan, Navaneeth; Navarro Moldes, Leandro
    Competitive project

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  • Supporting cloud deployment in the Guifi.net community network

     Jiménez, Javi; Baig, Roger; Escrich, Pau; Khan, Muhammad Amin; Freitag, Felix; Navarro Moldes, Leandro; Pietrosemoli, Ermanno; Zennaro, Marco; H. Payberah, Amir; Vlassov, Vladimir
    Global Information Infrastructure and Networking Symposium
    p. 103-105
    DOI: 10.1109/GIIS.2013.6684361
    Presentation's date: 2013-10
    Presentation of work at congresses

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    Community networking is an emerging model of a shared communication infrastructure in which communities of citizens build and own open networks. Community networks offer successfully IP-based networking to the user. Cloud computing infrastructures however, while common in today's Internet, hardy exist in community networks. We explain our approach to bring clouds into the Guifi.net community network. For this we have started integrating part of our cloud prototype into the Guifi.net community network management tools. A proof-of-concept cloud infrastructure is currently under deployment in the Guifi.net community network. Our long term vision is that the users of community networks will not need to consume cloud applications from the Internet, but find them within the community network.

  • Towards incentive-based resource assignment and regulation in clouds for community networks

     Khan, Muhammad Amin; Buyuksahin, Umit C.; Freitag, Felix
    International Conference on Economics of Grids, Clouds, Systems and Services
    p. 197-211
    DOI: 10.1007/978-3-319-02414-1_15
    Presentation's date: 2013-09
    Presentation of work at congresses

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    Community networks are built with off-the-shelf communication equipment aiming to satisfy a community's demand for Internet access and services. These networks are a real world example of a collective that shares ICT resources. But while these community networks successfully achieve the IP connectivity over the shared network infrastructure, the deployment of applications inside of community networks is surprisingly low. Given that community networks are driven by volunteers, we believe that bringing in incentive-based mechanisms for service and application deployments in community networks will help in unlocking its true potential. We investigate in this paper such mechanisms to steer user contributions, in order to provide cloud services from within community networks. From the analysis of the community network's topology, we derive two scenarios of community clouds, the local cloud and the federated cloud. We develop an architecture tailored to community networks which integrates the incentive mechanism we propose. In simulations of large scale community cloud scenarios we study the behaviour of the incentive mechanism in different configurations, where slices of homogeneous virtual machine instances are shared. Our simulation results allow us to understand better how to configure such an incentive mechanism in a future prototype of a real community cloud system, which ultimately should lead to realisation of clouds in community networks.

  • Community home gateways for P2P clouds

     Escrich, Pau; Baig, Roger; Vilalta, Ivan; Neumann, Axel; Aymerich, Marc; Lopez Berga, Ester; Vega D'Aurelio, Davide; Meseguer Pallares, Roque; Freitag, Felix; Navarro Moldes, Leandro
    International Conference on Peer-to-Peer Computing
    p. 1-2
    DOI: 10.1109/P2P.2013.6688732
    Presentation's date: 2013-09-11
    Presentation of work at congresses

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    P2P based clouds built with low-end devices and voluntarily contributed resources have been proposed by several authors. While some work was published on architectures and decentralized P2P-based mechanisms for such clouds, yet no complete system has been presented which implements such cloud systems without important limitations. We present the community home gateway, a computer system attached to a wireless community network router, able to host platform and application services. Different to current home gateways and other low-end systems, the community home gateway offers resource virtualization, and can thus be used as cloud resource. The community home gateway removes the lack of a system open for service contributions and therefore constitutes an important step for researchers and developers towards building P2P clouds with low-end devices. While we present the community home gateway as being part of a P2P community cloud, the applications scenarios of the system that can be imagined go beyond community networks.

  • Incentivos basados en el esfuerzo para compartir recursos en aplicaciones colaborativas

     Vega D'Aurelio, Davide; Meseguer Pallares, Roque; Freitag, Felix; Navarro Moldes, Leandro
    Jornadas de Concurrencia y Sistemas Distribuidos
    Presentation's date: 2013-06-20
    Presentation of work at congresses

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    Las aplicaciones colaborativas voluntarias necesitan implementar mecanismos de incentivos para regular la compartición de los recursos y fomentar la contribución de los nodos de la red. Por lo general, estos mecanismos de incentivos asignan recursos a los nodos bajo petición, y se basan en la cantidad total de los recursos aportados por el solicitante. Este enfoque asume que los participantes que más contribuyen deben también obtener más recursos del entorno colaborativo. Esta suposición hace el sistema injusto para los participantes con escasos recursos ya que tienen problemas para compartir debido a sus pocos recursos. En este trabajo proponemos el uso de una estrategia de incentivos basada en la relación entre la contribución y los recursos de cada nodo, es decir, un enfoque basado en el esfuerzo. Evaluamos y comparamos esta propuesta con las estrategias basadas en la contribución. Los resultados obtenidos muestran que el enfoque propuesto basado en el esfuerzo no sólo beneficia a los participantes que cuentan con escasos recursos, sino también es capaz de satisfacer las peticiones de los nodos con mayores recursos.

  • Effort-based incentives for resource sharing in collaborative volunteer applications

     Vega D'Aurelio, Davide; Meseguer Pallares, Roque; Freitag, Felix; Ochoa, Sergio
    International Conference on Computer Supported Cooperative Work in Design
    p. 37-41
    DOI: 10.1109/CSCWD.2013.6580936
    Presentation's date: 2013-06-27
    Presentation of work at congresses

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    Collaborative and volunteer applications need to implement incentive mechanisms to regulate resource sharing and encourage network nodes to contribute for reaching a certain goal. Typically, these incentive mechanisms assign resources to network node requests, based on the total amount of resources contributed by the requesting participant. This approach assumes that participants contributing more should also get back more resources from the collaborative environment. This assumption turns the system unfair to those participants with scarce resources, because they have just few resources to share. This paper proposes the use of an incentive strategy based on the contribution percentage of each node; i.e. an effort-based approach. This proposal is evaluated and compared to contribution-based strategies. The obtained results show that the proposed effort-based approach not only benefits participants that have scarce resources, but also it is able to satisfy the requests of the powerful nodes.

  • Support service for reciprocal computational resource sharing in wireless community networks

     Buyuksahin, Umit C.; Khan, Muhammad Amin; Freitag, Felix
    IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks
    p. 1-6
    DOI: 10.1109/WoWMoM.2013.6583482
    Presentation's date: 2013-06
    Presentation of work at congresses

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    In community networks, individuals and local organizations from a geographic area team up to create and run a community-owned IP network to satisfy the community's demand for ICT, such as facilitating Internet access and providing services of local interest. Most current community networks use wireless links for the node interconnection, applying off-the-shelf wireless equipment. While IP connectivity over the shared network infrastructure is successfully achieved, the deployment of applications in community networks is surprisingly low. To address the solution of this problem, we propose in this paper a service to incentivize the contribution of computing and storage as cloud resources to community networks, in order to stimulate the deployment of services and applications. Our final goal is the vision that in the long term, the users of community networks will not need to consume applications from the Internet, but find them within the wireless community network.

  • A Community networking Cloud in a box

     Meseguer Pallares, Roque; Navarro Moldes, Leandro; Selimi, Mennan; Khan, Muhammad Amin; Vega D'Aurelio, Davide; Freitag, Felix
    Competitive project

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  • Premi a la Diversitat Cultural i Identitat, Diversitat Lingüística i Contingut Local

     Casanellas, Felix; Navarro Moldes, Leandro; Freitag, Felix
    Award or recognition

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  • A summary of virtualization techniques

     Rodríguez Haro, Fernando; Freitag, Felix; Navarro Moldes, Leandro; Hernández Sánchez, Efraín; Farías Mendoza, Nicandro; Guerrero Ibañez, Juan Antonio; González Potes, Apolinar
    Iberoamerican Conference on Electronics Engineering and Computer Science
    p. 267-272
    DOI: 10.1016/j.protcy.2012.03.029
    Presentation of work at congresses

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  • Trade-off Among Timeliness, Messages and Accuracy For Large-Scale Information Management  Open access

     Brunner, René
    Department of Computer Architecture, Universitat Politècnica de Catalunya
    Theses

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    The increasing amount of data and the number of nodes in large-scale environments require new techniques for information management. Examples of such environments are the decentralized infrastructures of Computational Grid and Computational Cloud applications. These large-scale applications need different kinds of aggregated information such as resource monitoring, resource discovery or economic information. The challenge of providing timely and accurate information in large scale environments arise from the distribution of the information. Reasons for delays in distributed information system are a long information transmission time due to the distribution, churn and failures. A problem of large applications such as peer-to-peer (P2P) systems is the increasing retrieval time of the information due to the decentralization of the data and the failure proneness. However, many applications need a timely information provision. Another problem is an increasing network consumption when the application scales to millions of users and data. Using approximation techniques allows reducing the retrieval time and the network consumption. However, the usage of approximation techniques decreases the accuracy of the results. Thus, the remaining problem is to offer a trade-off in order to solve the conflicting requirements of fast information retrieval, accurate results and low messaging cost. Our goal is to reach a self-adaptive decision mechanism to offer a trade-off among the retrieval time, the network consumption and the accuracy of the result. Self-adaption enables distributed software to modify its behavior based on changes in the operating environment. In large-scale information systems that use hierarchical data aggregation, we apply self-adaptation to control the approximation used for the information retrieval and reduces the network consumption and the retrieval time. The hypothesis of the thesis is that approximation techniquescan reduce the retrieval time and the network consumption while guaranteeing an accuracy of the results, while considering user’s defined priorities. First, this presented research addresses the problem of a trade-off among a timely information retrieval, accurate results and low messaging cost by proposing a summarization algorithm for resource discovery in P2P-content networks. After identifying how summarization can improve the discovery process, we propose an algorithm which uses a precision-recall metric to compare the accuracy and to offer a user-driven trade-off. Second, we propose an algorithm that applies a self-adaptive decision making on each node. The decision is about the pruning of the query and returning the result instead of continuing the query. The pruning reduces the retrieval time and the network consumption at the cost of a lower accuracy in contrast to continuing the query. The algorithm uses an analytic hierarchy process to assess the user’s priorities and to propose a trade-off in order to satisfy the accuracy requirements with a low message cost and a short delay. A quantitative analysis evaluates our presented algorithms with a simulator, which is fed with real data of a network topology and the nodes’ attributes. The usage of a simulator instead of the prototype allows the evaluation in a large scale of several thousands of nodes. The algorithm for content summarization is evaluated with half a million of resources and with different query types. The selfadaptive algorithm is evaluated with a simulator of several thousands of nodes that are created from real data. A qualitative analysis addresses the integration of the simulator’s components in existing market frameworks for Computational Grid and Cloud applications. The proposed content summarization algorithm reduces the information retrieval time from a logarithmic increase to a constant factor. Furthermore, the message size is reduced significantly by applying the summarization technique. For the user, a precision-recall metric allows defining the relation between the retrieval time and the accuracy. The self-adaptive algorithm reduces the number of messages needed from an exponential increase to a constant factor. At the same time, the retrieval time is reduced to a constant factor under an increasing number of nodes. Finally, the algorithm delivers the data with the required accuracy adjusting the depth of the query according to the network conditions.

    La gestió de la informació exigeix noves tècniques que tractin amb la creixent quantitat de dades i nodes en entorns a gran escala. Alguns exemples d’aquests entorns són les infraestructures descentralitzades de Computacional Grid i Cloud. Les aplicacions a gran escala necessiten diferents classes d’informació agregada com monitorització de recursos i informació econòmica. El desafiament de proporcionar una provisió ràpida i acurada d’informació en ambients de grans escala sorgeix de la distribució de la informació. Una raó és que el sistema d’informació ha de tractar amb l’adaptabilitat i fracassos d’aquests ambients. Un problema amb aplicacions molt grans com en sistemes peer-to-peer (P2P) és el creixent temps de recuperació de l’informació a causa de la descentralització de les dades i la facilitat al fracàs. No obstant això, moltes aplicacions necessiten una provisió d’informació puntual. A més, alguns usuaris i aplicacions accepten inexactituds dels resultats si la informació es reparteix a temps. A més i més, el consum de xarxa creixent fa que sorgeixi un altre problema per l’escalabilitat del sistema. La utilització de tècniques d’aproximació permet reduir el temps de recuperació i el consum de xarxa. No obstant això, l’ús de tècniques d’aproximació disminueix la precisió dels resultats. Així, el problema restant és oferir un compromís per resoldre els requisits en conflicte d’extracció de la informació ràpida, resultats acurats i cost d’enviament baix. El nostre objectiu és obtenir un mecanisme de decisió completament autoadaptatiu per tal d’oferir el compromís entre temps de recuperació, consum de xarxa i precisió del resultat. Autoadaptacío permet al programari distribuït modificar el seu comportament en funció dels canvis a l’entorn d’operació. En sistemes d’informació de gran escala que utilitzen agregació de dades jeràrquica, l’auto-adaptació permet controlar l’aproximació utilitzada per a l’extracció de la informació i redueixen el consum de xarxa i el temps de recuperació. La hipòtesi principal d’aquesta tesi és que els tècniques d’aproximació permeten reduir el temps de recuperació i el consum de xarxa mentre es garanteix una precisió adequada definida per l’usari. La recerca que es presenta, introdueix un algoritme de sumarització de continguts per a la descoberta de recursos a xarxes de contingut P2P. Després d’identificar com sumarització pot millorar el procés de descoberta, proposem una mètrica que s’utilitza per comparar la precisió i oferir un compromís definit per l’usuari. Després, introduïm un algoritme nou que aplica l’auto-adaptació a un ordre per satisfer els requisits de precisió amb un cost de missatge baix i un retard curt. Basat en les prioritats d’usuari, l’algoritme troba automàticament un compromís. L’anàlisi quantitativa avalua els algoritmes presentats amb un simulador per permetre l’evacuació d’uns quants milers de nodes. El simulador s’alimenta amb dades d’una topologia de xarxa i uns atributs dels nodes reals. L’algoritme de sumarització de contingut s’avalua amb mig milió de recursos i amb diferents tipus de sol·licituds. L’anàlisi qualitativa avalua la integració del components del simulador en estructures de mercat existents per a aplicacions de Computacional Grid i Cloud. Així, la funcionalitat implementada del simulador (com el procés d’agregació i la query language) és comprovada per la integració de prototips. L’algoritme de sumarització de contingut proposat redueix el temps d’extracció de l’informació d’un augment logarítmic a un factor constant. A més, també permet que la mida del missatge es redueix significativament. Per a l’usuari, una precision-recall mètric permet definir la relació entre el nivell de precisió i el temps d’extracció de la informació. Alhora, el temps de recuperació es redueix a un factor constant sota un nombre creixent de nodes. Finalment, l’algoritme reparteix les dades amb la precisió exigida i ajusta la profunditat de la sol·licitud segons les condicions de xarxa. Els algoritmes introduïts són prometedors per ser utilitzats per l’agregació d’informació en nous sistemes de gestió de la informació de gran escala en el futur.

  • Community Networks Testbed for the Future Internet

     Freitag, Felix; León Gutiérrez, Xavier; Meseguer Pallares, Roque; Lopez Berga, Ester; Vega D'Aurelio, Davide; Cerdà Alabern, Llorenç; Rameshan, Navaneeth; Medina Medina, Esunly; Dimogerontakis, Emmanouil; Neumann, Axel; Navarro Moldes, Leandro
    Competitive project

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  • Self-regulated trade-off among timeliness, messages and accuracy for approximate queries in large-scale information aggregation

     Brunner, René; Freitag, Felix; Navarro Moldes, Leandro
    International Conference on Network-Based Information Systems
    p. 258-267
    DOI: 10.1109/NBIS.2011.45
    Presentation's date: 2011-09-07
    Presentation of work at congresses

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    In data management for large-scale applications such as Peer-to-Peer networks, and Grid and Cloud Computing arise challenges in regard to the decentralization of the application and in regard to an increasing number of failures. A consequence of these conditions is an increasing retrieval time, inaccurate results and higher network consumption. A solution to restrain an increasing retrieval time and an increasing number of messages is the introduction of approximate queries. The introduction of approximate queries limits the querying of all nodes of a network to a subset of nodes in the cost of the results' accuracy. Thus, a conflict to provide a large-scalability lies in guaranteeing accurate data, in the provision of fast results and in a low consumption of network bandwidth. Therefore, we propose an information aggregation that is based on an analytic hierarchical process (AHP) to find a trade-off among the unpredictable factors of time, messages and accuracy. After a user defines the preferences for the retrieval process, the AHP-based algorithm makes autonomous decisions on each node. The algorithm decides autonomously about pruning the approximate queries to reach an optimal trade-off from a global perspective. Applying the self-regulated pruning of the approximate queries allows reducing the messages from an exponential in crease to a constant factor. At the same time, the retrieval time is reduced from a linear increase to a constant factor in regard to an increasing number of nodes. At the same time of reducing the retrieval time and network bandwidth, the AHP-based self-regulation guarantees certain level of accuracy

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    Diseño e implementación de un simulador para explorar la cooperación en entornos distribuidos  Open access

     Vega D'Aurelio, Davide; Meseguer Pallares, Roque; Freitag, Felix
    Jornadas de Concurrencia y Sistemas Distribuidos
    p. 311-326
    Presentation's date: 2011-06
    Presentation of work at congresses

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    Los avances tecnológicos en los sistemas de comunicación y computación móviles están impulsando la emergencia de sistemas colaborativos distribuidos. No obstante, la participación de los usuarios se ve frenada por los escasos recursos disponibles en los dispositivos móviles actuales. En este artículo se presenta un simulador de redes colaborativas descentralizadas que permite estudiar cómo la topología de la red y las estrategias de los diferentes participantes pueden incentivar y mejorar su participación activa {colaboración{ en este tipo de escenarios. Los resultados obtenidos en las simulaciones realizadas sobre redes de overlay, nos han permitido realizar observaciones importantes en cuánto a cómo distribuir los recursos en las redes con dispositivos heterogéneos, qué tipo de estrategias de colaboración y colocación de nodos o qué topologías pueden incentivar la participación activa. Por ello, consideramos el simulador una buena herramienta para analizar este tipo de escenarios desde un punto de vista empírico.

  • A node placement heuristic to encourage resource sharing in mobile computing

     Vega D'Aurelio, Davide; Medina Medina, Esunly; Meseguer Pallares, Roque; Royo Valles, Maria Dolores; Freitag, Felix
    International Conference on Computational Science and Its Applications
    p. 540-555
    DOI: 10.1007/978-3-642-21931-3_42
    Presentation's date: 2011-06-23
    Presentation of work at congresses

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  • SISTEMAS DISTRIBUIDOS AUTO-ADAPTABLES PARA LA INTERNET DEL FUTURO

     Meseguer Pallares, Roque; Freitag, Felix; Chacin Martinez, Pablo Jesus; Vega D'Aurelio, Davide; León Gutiérrez, Xavier; Brunner, René; Royo Valles, Maria Dolores; Gallardo Gomez, Antonia; Reyes Muñoz, M. Angélica; Medina Medina, Esunly; Lopez Berga, Ester; Navarro Moldes, Leandro
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  • Characterizing the effects of sharing hardware resources in mobile collaboration scenarios

     Vega D'Aurelio, Davide; Medina Medina, Esunly; Meseguer Pallares, Roque; Royo Valles, Maria Dolores; Freitag, Felix; Ochoa, Sergio; Pino, José
    International Conference on Computer Supported Cooperative Work in Design
    p. 465-472
    DOI: 10.1109/CSCWD.2011.5960114
    Presentation's date: 2011
    Presentation of work at congresses

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  • SISTEMAS DISTRIBUIDOS AUTO-ADAPTABLES PARA LA INTERNET DEL FUTURO

     Navarro Moldes, Leandro; Meseguer Pallares, Roque; Freitag, Felix; Chacin Martinez, Pablo Jesus; León Gutiérrez, Xavier; Royo Valles, Maria Dolores; Reyes Muñoz, M. Angélica
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  • Toward QoS provision for virtualized resources in grids

     Rodríguez Haro, Fernando; Freitag, Felix; Navarro Moldes, Leandro
    DOI: 978-1-4419-5597-5
    Date of publication: 2010-03-10
    Book chapter

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    Virtualization solutions have recently gained considerable attention for supporting the consolidation of application servers into one physical machine. In a vanilla Xen implementation the scheduler shares equally all of the available physical CPU resources among the contending VMs. However, when the application that runs in the virtual machine space changes dynamically its resource requirements, a different solution is needed. Furthermore, if the resource usage is associated with service-level agreements, a predefined equal share of the processor power is not sufficient for the VMs. In this chapter, we present an approach to manage the QoS of virtualized resources in Grids. Our solution adjusts the resources needed by each VM according to an agreed QoS. We achieve this by a local resource manager (LRM), which we implemented as a prototype and deployed on Xen-virtualized machines. By means of experiments we show that the implemented management component can meet the service-level objectives (SLOs) by dynamically adjusting virtualized resources according to demand.

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    On network flow management in virtualized environments  Open access

     Rodríguez Haro, Fernando; Freitag, Felix; Navarro Moldes, Leandro; Farías Mendoza, Nicandro; Guerrero Ibañez, Juan Antonio
    International Conference on Electrical Engineering, Computing Science and Automatic Control
    p. 427-432
    DOI: 10.1109/ICEEE.2009.5393421
    Presentation's date: 2009-11-10
    Presentation of work at congresses

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    Virtualization has enabled the use of virtual machine (VM) based resource providers to offer computing power as a service. However, one important feature is to have certainty about the planed or expected performance of the applications that run inside the VMs. Therefore, consolidating the work load of web-based applications, with time-varying resource requirements, should be done in an automated way. We present and evaluate a network flow management component for the admission control of HTTP connections. We study this component, in our local resource manager (LRM), by using two types of common Web-based applications. The preliminary results shows that we can meet the number of successful served requests and at the same time avoid the degradation in the application's response times.

  • IE09.Conferencia internacional: Intelligent Environments 2009 (IE09, quinta edición)

     Meseguer Pallares, Roque; Reyes Muñoz, M. Angélica; Freitag, Felix; Royo Valles, Maria Dolores; Navarro Moldes, Leandro
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  • Autonomous Management in VM-based Resource Providers.

     Rodríguez Haro, Fernando
    Department of Computer Architecture, Universitat Politècnica de Catalunya
    Theses

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  • Fostering efficiency of computational resource allocation - Integrating information services into markets

     Borissov, Nikolai; Brunner, René; Neumann, Dirk; Freitag, Felix; Navarro Moldes, Leandro; Weinhardt, Christof
    European Conference on Information Systems
    p. 1-12
    Presentation's date: 2009-06
    Presentation of work at congresses

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  • Regulation of resource allocation for experimental distributed systems

     Freitag, Felix; Navarro Moldes, Leandro
    Competitive project

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  • Grid Middleware and Services

     Liviu, Joita; Omer, F Rana; Isaac, Chao; Chacin Martinez, Pablo Jesus; Freitag, Felix; Navarro Moldes, Leandro; Ardaiz, Oscar
    Date of publication: 2008-12
    Book

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  • P2PGRID: Self-adjusting Peer-to-peer and Grid Systems (TIN2007-68050-C03-01)

     Navarro Moldes, Leandro; Chacin Martinez, Pablo Jesus; Reyes Muñoz, M. Angélica; Gallardo Gomez, Antonia; Freitag, Felix; Meseguer Pallares, Roque; Royo Valles, Maria Dolores; Artigas Vidal, Pau; Marques Puig, Joan Manel; Sanjeevan, Kanapathipillai; Brunner, René; León Gutiérrez, Xavier; Medina Medina, Esunly
    Competitive project

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  • Core Services For Grid Markets

     Chacin Martinez, Pablo Jesus; Xavier, Leon; Brunner, René; Freitag, Felix; Navarro Moldes, Leandro
    CoreGRID Symposium
    p. 206-215
    Presentation's date: 2008-08-25
    Presentation of work at congresses

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  • Core Services for Grid Markets

     Freitag, Felix
    From Grids to Service and Pervasive Computing
    Presentation's date: 2008-08-25
    Presentation of work at congresses

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  • Aplicación "Demo de proyectos" para mejorar la propuesta de proyectos en una asignatura de proyectos

     Freitag, Felix
    Jornadas de Enseñanza Universitaria de la Informática
    Presentation's date: 2008-07-09
    Presentation of work at congresses

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  • Aplicación Web para la demostración de proyectos

     Freitag, Felix; Liarte, Laura; Navarro Moldes, Leandro; Cabellos Aparicio, Alberto; Guerrero Zapata, Manel
    Congrés Internacional de Docència Universitària i Innovació
    p. 1-7
    Presentation's date: 2008-07-02
    Presentation of work at congresses

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  • Core services for grid markets

     Chacin Martinez, Pablo Jesus; León Gutiérrez, Xavier; Brunner, René; Freitag, Felix; Navarro Moldes, Leandro
    DOI: 10.1007/978-0-387-09455-7
    Date of publication: 2008-07-29
    Book chapter

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  • Access to the full text
    Information and regulation in decentralized marketplaces for P2P-Grids  Open access

     León Gutiérrez, Xavier; Vilajosana Guillen, Xavier; Brunner, René; Krishnaswamy, Ruby; Navarro Moldes, Leandro; Freitag, Felix; Marquès, Joan Manuel
    IEEE International Workshop on Enabling Technologies: Infrastructure for Collaborative Enterprises
    p. 133-138
    DOI: 10.1109/WETICE.2008.12
    Presentation's date: 2008-06-23
    Presentation of work at congresses

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    Large scale systems such as the Grid need scalable and efficient resource allocation mechanisms to fulfil the requirements of its participants and applications while the whole system is regulated to work efficiently. Economics inspired models have shown ability to handle efficiently the allocation of resources and services, scaling up well as they are decentralized. Our model considers the arbitration of decisions at the local scope and short term, the regulation of the system at global scope, and the sharing of information between global and local environments. This paper presents a scalable model and evaluates by simulation a system where global market information circulates in aggregated and scalable form, the rate of demand by participants is globally regulated by a currency mechanism, preference is regulated by a reputation mechanism, and local regulation among competing participants is resolved by auction mechanisms. The paper shows how scalable systems benefit from distributed marketplaces supporting global information flow to regulate and optimize local and global behavior.

  • Towards QoS Provision For Virtualized Resources in Grids

     Freitag, Felix
    INGRID 2008 Instrumenting the Grid
    Presentation's date: 2008-04-09
    Presentation of work at congresses

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  • Improving the Introduction to a Collaborative Project-Based Course on Computer Network Applications

     Freitag, Felix; Navarro Moldes, Leandro; Marques Puig, Joan Manel
    Computational Science- ICCS'2008
    p. 669-677
    Presentation of work at congresses

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  • On the Simulation of Risk in Open Global Computing Infrastructures

     Torsten, Eymann; Sebastian, Hudert; Raimund, Matros; Streitberger, Werner; Navarro Moldes, Leandro; Freitag, Felix; Isaac, Chao
    Integrated Research in Grid Computing
    p. 335-346
    Presentation of work at congresses

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  • Autonomous Management in Virtual-machine-based Resource Providers

     Rodriguez, Fernando; Freitag, Felix; Navarro Moldes, Leandro
    IEEE International Conference on Self-Adaptive and Self-Organizing Systems
    p. 255-264
    DOI: 10.1109/SASO.2008.52
    Presentation's date: 2008
    Presentation of work at congresses

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  • Aplicación "Demo proyectos" para mejorar la propuesta de proyectos en una asignatura de proyectos

     Freitag, Felix; Navarro Moldes, Leandro; Cabellos Aparicio, Alberto; Marques Puig, Joan Manel
    Jornadas de Enseñanza Universitaria de la Informática
    p. 549-556
    Presentation of work at congresses

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  • Towards the Development of a Decentralized Market Information System: Requirements and Architecture

     Brunner, René; Freitag, Felix; Navarro Moldes, Leandro
    IEEE International Parallel and Distributed Processing Symposium
    p. 1-7
    Presentation of work at congresses

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  • Towards QOS Provision for Virtualized Resources in Grids

     Rodriguez, Fernando; Freitag, Felix; Navarro Moldes, Leandro
    INGRID 2008 Instrumenting the Grid
    p. 99-108
    DOI: 10.1007/978-1-4419-5597-5
    Presentation of work at congresses

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  • Uncertainty management for the retrieval of economic information for distributed markets

     Brunner, René; Freitag, Felix; Navarro Moldes, Leandro
    international conference on Scalable Uncertainty Management
    p. 106-119
    DOI: 10.1007/978-3-540-87993-0_10
    Presentation's date: 2008
    Presentation of work at congresses

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  • Uncertainty Management for the Retrieval of Economic Information from Distributed Markets

     Brunner, René; Freitag, Felix; Navarro Moldes, Leandro
    international conference on Scalable Uncertainty Management
    p. 106-119
    DOI: 10.1007/978-3-540-87993-0_10
    Presentation's date: 2008
    Presentation of work at congresses

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  • On the use of intelligent local resource management for improved virtualized resource provision: challenges, required features, and an approach

     Rodríguez, Fernando; Freitag, Felix; Navarro Moldes, Leandro
    Workshop on System-level Virtualization for High Performance Computing
    p. 24-31
    DOI: 10.1145/1435452.1435456
    Presentation's date: 2008
    Presentation of work at congresses

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  • Towards Intelligent Management in VM-based Resource Providers

     Freitag, Felix
    1st International DMTFAcademic Alliance Workshop on Systems and Virtualization Management: Standards and New Technologies
    Presentation's date: 2007-10-23
    Presentation of work at congresses

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  • Prototyping the Access of Handheld Device Clients to a Distributed Service Infrastructure

     Freitag, Felix
    International Conference on Intelligent Environments
    Presentation's date: 2007-09-24
    Presentation of work at congresses

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  • Performance Measuring Framework for Grid Market Middleware

     Freitag, Felix
    European Performance Engineering Workshop
    Presentation's date: 2007-09-01
    Presentation of work at congresses

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  • On Economic Information Acquisition for Distributed Grid Markets

     Brunner, R; Freitag, Felix; Navarro Moldes, Leandro
    Date: 2007-06
    Report

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