Ara es mostren els items 21-40 de 53

    • Enhancing iteration performance on distributed task-based workflows 

      Barceló Cuerda, Alex; Queralt Calafat, Anna; Cortés, Toni (Elsevier, 2023-12)
      Article
      Accés restringit per política de l'editorial
      Task-based programming models have proven to be a robust and versatile way to approach development of applications for distributed environments. They provide natural programming patterns with high performance. However, ...
    • Evaluating the effectiveness of REDCAP to recover the locality missed by today's Linux Systems 

      González Férez, Pilar; Piernas, Juan; Cortés, Toni (2008-10)
      Comunicació de congrés
      Accés obert
      In order to know how different conditions influence the behavior of the RAM Enhanced Disk Cache Project (REDCAP), we have analyzed the impact of the file system and the REDCAP cache size. The results show that, for workloads ...
    • Exploring the predictability of MPI messages 

      Freitag, Fèlix; Caubet Serrabou, Jordi; Farreras Esclusa, Montserrat; Cortés, Toni; Labarta Mancho, Jesús José (IEEE Computer Society, 2003)
      Text en actes de congrés
      Accés obert
      Scalability to a large number of processes is one of the weaknesses of current MPI implementations. Standard implementations are able to scale to hundreds of nodes, but none beyond that. The main problem of current ...
    • FaTLease: scalable fault-tolerant lease negotiation with Paxos 

      Hupfeld, Felix; Kolbeck, Björn; Stender, Jan; Högqovist, Mikael; Cortés, Toni; Marti, Jonathan; Malo, Jesús (2008-06)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A lease is a token which grants its owner exclusive access to a resource for a defined span of time. In order to be able to tolerate failures, leases need to be coordinated by distributed processes. We present FaTLease, ...
    • File system scalability with highly decentralized metadata on independent storage devices 

      Lensing, Paul Hermann; Cortés, Toni; Hughes, Jim; Brinkmann, Andre (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper discusses using hard drives that integrate a key-value interface and network access in the actual drive hardware (Kinetic storage platform) to supply file system functionality in a large scale environment. Taking ...
    • Freezing time emulating new and faster devices with virtual machines 

      Bona, Luis C.E.; Elias, Alessandro; Ziviani, Andre P.; Nou, Ramon; Cortés, Toni; Alves, Marco A.Z. (Springer, 2020)
      Article
      Accés obert
      Recent proposals of emerging data storage devices make it necessary to reevaluate all levels of the storage hierarchy to optimize the software stack performance. However, these new devices are not always widely available ...
    • Freezing Time: a new approach for emulating fast storage devices using VM 

      Bona, Luis C.E.; Elias, Alessandro; Ziviani, Andre P.; Cortés, Toni; Nou Castell, Ramon; Alves, Marco A.Z. (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Text en actes de congrés
      Accés obert
      Recently we are seeing a considerable effort from both academy and industry in proposing new technologies for storage devices. Often these devices are not readily available for evaluation and methods to allow performing ...
    • Fusing storage and computing for the domain of business intelligence and analytics: research opportunities 

      Queralt Calafat, Anna; Marti Fraiz, Jonathan; Baars, Henning; Brinkmann, Andre; Cortés, Toni (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      With the growing importance of external and shared data, the set of requirements for Business Intelligence and Analytics (BIA) is shifting. Current solutions still come with shortcomings, esp. In multi-stakeholder environments ...
    • GekkoFS: A temporary burst buffer file system for HPC applications 

      Vef, Marc-André; Moti, Nafiseh; Süb, Tim; Tacke, Markus; Tocci, Tommaso; Nou, Ramon; Miranda Bueno, Alberto; Cortés, Toni; Brinkmann, Andre (2020-01-17)
      Article
      Accés obert
      Many scientific fields increasingly use high-performance computing (HPC) to process and analyze massive amounts of experimental data while storage systems in today’s HPC environments have to cope with new access patterns. ...
    • GekkoFS: A temporary distributed file system for HPC applications 

      Vef, Marc-André; Moti, Nafiseh; Süb, Tim; Tocci, Tommaso; Nou Castell, Ramon; Miranda, Alberto; Cortés, Toni; Brinkmann, Andre (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Text en actes de congrés
      Accés obert
      We present GekkoFS, a temporary, highly-scalable burst buffer file system which has been specifically optimized for new access patterns of data-intensive High-Performance Computing (HPC) applications. The file system ...
    • HetFS: A heterogeneous file system for everyone 

      Koloventzos, Georgios; Nou Castell, Ramon; Miranda, Alberto; Cortés, Toni (Springer, 2017)
      Text en actes de congrés
      Accés obert
      Storage devices have been getting more and more diverse during the last decade. The advent of SSDs made it painfully clear that rotating devices, such as HDDs or magnetic tapes, were lacking in regards to response time. ...
    • Improving I/O performance through an in-kernel disk simulator 

      González Férez, Pilar; Piernas Canovas, Juan; Cortés, Toni (2016-10-01)
      Article
      Accés obert
      This paper presents two mechanisms that can significantly improve the I/O performance of both hard and solid-state drives for read operations: KDSim and REDCAP. KDSim is an in-kernel disk simulator that provides a framework ...
    • Improving OpenStack Swift interaction with the I/O stack to enable software defined storage 

      Nou Castell, Ramon; Miranda, Alberto; Siquier, Marc; Cortés, Toni (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Text en actes de congrés
      Accés obert
      This paper analyses how OpenStack Swift, a distributed object storage service for a globally used middleware, interacts with the I/O subsystem through the Operating System. This interaction, which seems organised and clean ...
    • IOStack: Software-Defined Object Storage 

      Gracia-Tinedo, Raúl; García-López, Pedro; Sánchez-Artigas, Marc; Sampé, Josep; Moatti, Yosef; Rom, Eran; Naor, Dalit; Nou Castell, Ramon; Cortés, Toni; Oppermann, William; Michiardi, Pietro (Institute of Electrical and Electronics Engineers (IEEE), 2016-05-05)
      Article
      Accés obert
      The complexity and scale of today’s cloud storage systems is growing fast. In response to these challenges, Software- Defined Storage (SDS) has recently become a prime candidate to simplify storage management in the ...
    • Measuring TCP bandwidth on top of a Gigabit and Myrinet network 

      Costa Prats, Juan José; Bueno Hedo, Javier; Martorell Bofill, Xavier; Cortés, Toni (2009)
      Report de recerca
      Accés obert
      In this article we measure the bandwidth achieved by the TCP protocol on top of a Gigabit and Myrinet network. We have created a synthetic benchmark, consisting on a server and a client that both produce and consume data, ...
    • Performance impacts with reliable parallel file systems at exascale level 

      Nou Castell, Ramon; Miranda, Alberto; Cortés, Toni (Springer, 2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The introduction of Exascale storage into production systems will lead to an increase on the number of storage servers needed by parallel file systems. In this scenario, parallel file system designers should move from the ...
    • Predicting access to persistent objects through static code analysis 

      Touma, Rizkallah; Queralt Calafat, Anna; Cortés, Toni; Pérez Hernandez, María S. (Springer, 2017)
      Text en actes de congrés
      Accés obert
      In this paper, we present a fully-automatic, high-accuracy approach to predict access to persistent objects through static code analysis of object-oriented applications. The most widely-used previous technique uses a simple ...
    • Predicting MPI buffer addresses. 

      Freitag, Fèlix; Farreras Esclusa, Montserrat; Cortés, Toni; Labarta Mancho, Jesús José (Springer, 2004)
      Comunicació de congrés
      Accés obert
      Communication latencies have been identified as one of the performance limiting factors of message passing applications in clusters of workstations/multiprocessors. On the receiver side, message-copying operations contribute ...
    • PyCOMPSs: Parallel computational workflows in Python 

      Tejedor, Enric; Becerra Fontal, Yolanda; Alomar, Guillem; Queralt Calafat, Anna; Badia Sala, Rosa Maria; Torres Viñals, Jordi; Cortés, Toni; Labarta Mancho, Jesús José (2017-01-01)
      Article
      Accés obert
      The use of the Python programming language for scientific computing has been gaining momentum in the last years. The fact that it is compact and readable and its complete set of scientific libraries are two important ...
    • Reliable and randomized data distribution strategies for large scale storage systems 

      Miranda Bueno, Alberto; Effert, S.; Kang, Y.; Miller, E.L.; Brinkmann, A.; Cortés, Toni (2011)
      Text en actes de congrés
      Accés obert
      The ever-growing amount of data requires highly scalable storage solutions. The most flexible approach is to use storage pools that can be expanded and scaled down by adding or removing storage devices. To make this approach ...