Now showing items 1-19 of 19

  • Automatic detection of parallel applications computation phases 

    González García, Juan; Giménez Lucas, Judit; Labarta Mancho, Jesús José (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    Conference report
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    Analyzing parallel programs has become increasingly difficult due to the immense amount of information collected on large systems. The use of clustering techniques has been proposed to analyze applications. However, while ...
  • Automatic evaluation of the computation structure of parallel applications 

    González García, Juan; Giménez Lucas, Judit; Labarta Mancho, Jesús José (Institute of Electrical and Electronics Engineers (IEEE), 2009)
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    Many data mining techniques have been proposed for parallel applications performance analysis, the most inter- esting being clustering analysis. Most cases have been used to detect processors with similar behavior. In ...
  • Automatic refinement of parallel applications structure detection 

    González, Juan; Huck, Kevin; Giménez Lucas, Judit; Labarta Mancho, Jesús José (2012)
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    Analyzing parallel programs has become increasingly difficult due to the immense amount of information collected on large systems. In this scenario, cluster analysis has been proved to be a useful technique to reduce the ...
  • Detailed and simultaneous power and performance analysis 

    Servat, Harald; Llort, German; Giménez Lucas, Judit; Labarta Mancho, Jesús José (2013-12)
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    On the road to Exascale computing, both performance and power areas are meant to be tackled at different levels, from system to processor level. The processor itself is the main responsible for the serial node performance ...
  • Detailed performance analysis using coarse grain sampling 

    Servat Gelabert, Harald; Llort Sanchez, German Matías; Giménez Lucas, Judit; Labarta Mancho, Jesús José (Springer, 2014)
    Conference report
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    Performance evaluation tools enable analysts to shed light on how applications behave both from a general point of view and at concrete execution points, but cannot provide detailed information beyond the monitored regions ...
  • Estimation of MPI application performance on volunteer environments 

    Nandagudi, Girish; Subhlok, Jaspal; Gabriel, Edgar; Giménez Lucas, Judit (Springer, 2011)
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    Emerging MPI libraries, such as VolpexMPI and P2P MPI, allow message passing parallel programs to execute effectively in heterogeneous volunteer environments despite frequent failures. However, the performance of message ...
  • Framework for a productive performance optimization 

    Servat, Harald; Llort, German; Huck, Kevin A.; Giménez Lucas, Judit; Labarta Mancho, Jesús José (2013-08)
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    Modern supercomputers deliver large computational power, but it is difficult for an application to exploit such power. One factor that limits the application performance is the single node performance. While many performance ...
  • Guided performance analysis combining profile and trace tools 

    Giménez Lucas, Judit; Labarta Mancho, Jesús José; Pegenaute Bresme, Xavier; Wen, Hui-Fang; Klepacki, David; Chung, I-Hsin; Cong, Guojing; Voigtländer, Felix; Mohr, Bernd (Springer, 2010)
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    Performance analysis is very important to understand the applications’ behavior and to identify bottlenecks. Performance analysis tools should facilitate the exploration of the data collected and help to identify where the ...
  • Identifying code phases using piece-wise linear regressions 

    Servat Gelabert, Harald; Llort Sanchez, German Matías; González García, Juan; Giménez Lucas, Judit; Labarta Mancho, Jesús José (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    Conference report
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    Node-level performance is one of the factors that may limit applications from reaching the supercomputers' peak performance. Studying node-level performance and attributing it to the source code results into valuable insight ...
  • Methodology to predict scalability of parallel applications 

    Rosas, Claudia; Giménez Lucas, Judit; Labarta Mancho, Jesús José (Barcelona Supercomputing Center, 2015-05-05)
    Conference report
    Open Access
    In the road to exascale computing, the inference of expected performance of parallel applications results in a complex task. Performance analysts need to identify the behavior of the applications and to extrapolate it to ...
  • On the usefulness of object tracking techniques in performance analysis 

    Llort Sanchez, German Matías; Servat Gelabert, Harald; González García, Juan; Giménez Lucas, Judit; Labarta Mancho, Jesús José (Association for Computing Machinery (ACM), 2013)
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    Understanding the behavior of a parallel application is crucial if we are to tune it to achieve its maximum performance. Yet the behavior the application exhibits may change over time and depend on the actual execution ...
  • On-line detection of large-scale parallel application's structure 

    Llort Sanchez, German Matías; González García, Juan; Servat Gelabert, Harald; Giménez Lucas, Judit; Labarta Mancho, Jesús José (Institute of Electrical and Electronics Engineers (IEEE), 2010)
    Conference report
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    With larger and larger systems being constantly deployed, trace-based performance analysis of parallel applications has become a daunting task. Even if the amount of performance data gathered per single process is ...
  • Performance data extrapolation in parallel codes 

    González García, Juan; Giménez Lucas, Judit; Labarta Mancho, Jesús José (Institute of Electrical and Electronics Engineers (IEEE), 2010)
    Conference report
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    Measuring the performance of parallel codes is a compromise between lots of factors. The most important one is which data has to be analyzed. Current supercomputers are able to run applications in large number of processors ...
  • Scalability analysis of Dalton, a molecular structure program 

    Aguilar, Xavier; Schliephake, Michael; Vahtras, Olav; Giménez Lucas, Judit; Laure, Erwin (Elsevier, 2013-10)
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    Dalton is a molecular electronic structure program featuring common methods of computational chemistry that are based on pure quantum mechanics (QM) as well as hybrid quantum mechanics/molecular mechanics (QM/MM). It is ...
  • Scaling Dalton: a molecular electronic structure program 

    Aguilar, Xavier; Schliepake, Michael; Vahtras, Olav; Giménez Lucas, Judit; Laure, Erwin (Institute of Electrical and Electronics Engineers (IEEE), 2011)
    Conference report
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    Dalton is a molecular electronic structure program featuring common methods of computational chemistry that are based on pure quantum mechanics (QM) as well as hybrid quantum mechanics/molecular mechanics (QM/MM). It is ...
  • Simulating whole supercomputer applications 

    González García, Juan; Casas, Marc; Giménez Lucas, Judit; Moreto Planas, Miquel; Ramírez Bellido, Alejandro; Labarta Mancho, Jesús José; Valero Cortés, Mateo (2011-06)
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    Detailed simulations of large scale message-passing interface parallel applications are extremely time consuming and resource intensive. A new methodology that combines signal processing and data mining techniques plus a ...
  • The HOPSA workflow and tools 

    Mohr, Bernd; Voevedin, Vladimir; Giménez Lucas, Judit; Hagersten, Erik; Knüpfer, Andreas; Nikitenko, Dmitry A.; Nilsson, Mats; Servat Gelabert, Harald; Shah, Aamer; Winkler, Frank; Wolf, Felix; Zhukov, Ilya (Springer, 2012)
    Conference report
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    To maximise the scientific output of a high-performance computing system, different stakeholders pursue different strategies. While individual application developers are trying to shorten the time to solution by optimising ...
  • Trace spectral analysis toward dynamic levels of detail 

    Llort Sanchez, German Matías; Casas Guix, Marc; Servat Gelabert, Harald; Huck, Kevin A.; Giménez Lucas, Judit; Labarta Mancho, Jesús José (Institute of Electrical and Electronics Engineers (IEEE), 2011)
    Conference report
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    The emergence of Petascale systems has raised new challenges to performance analysis tools. Understanding every single detail of an execution is important to bridge the gap between the theoretical peak and the actual ...
  • Unveiling internal evolution of parallel application computation phases 

    Servat Gelabert, Harald; Llort Sanchez, German Matías; Giménez Lucas, Judit; Huck, Kevin A.; Labarta Mancho, Jesús José (Institute of Electrical and Electronics Engineers (IEEE), 2011)
    Conference report
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    As access to supercomputing resources is becoming more and more commonplace, performance analysis tools are gaining importance in order to decrease the gap between the application performance and the supercomputers' peak ...