Now showing items 21-40 of 144

  • Automating the application data placement in hybrid memory systems 

    Servat, Harald; Peña, Antonio J.; Llort, German; Mercadal, Estanislao; Hoppe, Hans-Christian; Labarta Mancho, Jesús José (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    Conference report
    Open Access
    Multi-tiered memory systems, such as those based on Intel® Xeon Phi™processors, are equipped with several memory tiers with different characteristics including, among others, capacity, access latency, bandwidth, energy ...
  • A visual embedding for the unsupervised extraction of abstract semantics 

    García Gasulla, Dario; Ayguadé Parra, Eduard; Labarta Mancho, Jesús José; Béjar Alonso, Javier; Cortés García, Claudio Ulises; Suzumura, Toyotaro; Chen, R (2017-05-01)
    Article
    Open Access
    Vector-space word representations obtained from neural network models have been shown to enable semantic operations based on vector arithmetic. In this paper, we explore the existence of similar information on vector ...
  • Balancing HPC applications through smart allocation of resources in MT processors 

    Boneti, Carlos; Gioiosa, Roberto; Cazorla, Francisco; Corbalán González, Julita; Labarta Mancho, Jesús José; Valero Cortés, Mateo (Institute of Electrical and Electronics Engineers (IEEE), 2008)
    Conference report
    Open Access
    Many studies have shown that load imbalancing causes significant performance degradation in High Performance Computing (HPC) applications. Nowadays, Multi-Threaded (MT1) processors are widely used in HPC for their good ...
  • Bio-inspired call-stack reconstruction for performance analysis 

    Servat, Harald; Llort, German; González, Juan; Giménez Lucas, Judit; Labarta Mancho, Jesús José (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Conference report
    Open Access
    The correlation of performance bottlenecks and their associated source code has become a cornerstone of performance analysis. It allows understanding why the efficiency of an application falls behind the computer's peak ...
  • 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 ...
  • BSLD threshold driven parallel job scheduling for energy efficient HPC centers 

    Etinski, Maja; Corbalán González, Julita; Labarta Mancho, Jesús José; Valero Cortés, Mateo (2009)
    External research report
    Open Access
    Recently, power awareness in high performance computing (HPC) community has increased significantly. While CPU power reduction of HPC applications using Dynamic Voltage Frequency Scaling (DVFS) has been explored thoroughly, ...
  • BSLD threshold driven power management policy for HPC centers 

    Etinski, Maja; Corbalán González, Julita; Labarta Mancho, Jesús José; Valero Cortés, Mateo (Institute of Electrical and Electronics Engineers (IEEE), 2010)
    Conference report
    Open Access
    In this paper, we propose a power-aware parallel job scheduler assuming DVFS enabled clusters. A CPU frequency assignment algorithm is integrated into the well established EASY backfilling job scheduling policy. Running a ...
  • CATA: Criticality aware task acceleration for multicore processors 

    Castillo, Emilio; Moreto Planas, Miquel; Casas, Marc; Álvarez Martí, Lluc; Vallejo, Enrique; Chronaki, Kallia; Badia Sala, Rosa Maria; Bosque Orero, José Luis; Beivide Palacio, Julio Ramón; Ayguadé Parra, Eduard; Labarta Mancho, Jesús José; Valero Cortés, Mateo (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Conference report
    Open Access
    Managing criticality in task-based programming models opens a wide range of performance and power optimization opportunities in future manycore systems. Criticality aware task schedulers can benefit from these opportunities ...
  • CRC-based memory reliability for task-parallel HPC applications 

    Subasi, Omer; Unsal, Osman Sabri; Labarta Mancho, Jesús José; Yalcin, Gulay; Cristal Kestelman, Adrián (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Conference report
    Restricted access - publisher's policy
    Memory reliability will be one of the major concerns for future HPC and Exascale systems. This concern is mostly attributed to the expected massive increase in memory capacity and the number of memory devices in Exascale ...
  • cuHinesBatch: solving multiple hines systems on GPUs Human Brain Project 

    Valero-Lara, Pedro; Martinez-Perez, Ivan; Peña, Antonio J.; Martorell Bofill, Xavier; Sirvent, Raul; Labarta Mancho, Jesús José (Elsevier, 2017)
    Article
    Open Access
    The simulation of the behavior of the Human Brain is one of the most important challenges today in computing. The main problem consists of finding efficient ways to manipulate and compute the huge volume of data that this ...
  • DDT: a research tool for automatic data distribution in HPF 

    Ayguadé Parra, Eduard; García Almiñana, Jordi; Gironès Medina, Mercè; Grande Ayan, Ma. Luz; Labarta Mancho, Jesús José (1997-03)
    Article
    Open Access
    This article describes the main features and implementation of our automatic data distribution research tool. The tool (DDT) accepts programs written in Fortran 77 and generates High Performance Fortran (HPF) directives ...
  • Designing and modelling selective replication for fault-tolerant HPC applications 

    Subasi, Omer; Yalcin, Gulay; Zyulkyarov, Ferad; Unsal, Osman Sabri; Labarta Mancho, Jesús José (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    Conference report
    Open Access
    Fail-stop errors and Silent Data Corruptions (SDCs) are the most common failure modes for High Performance Computing (HPC) applications. There are studies that address fail-stop errors and studies that address SDCs. However ...
  • Detailed and simultaneous power and performance analysis 

    Servat, Harald; Llort, German; Giménez Lucas, Judit; Labarta Mancho, Jesús José (2013-12)
    Article
    Restricted access - publisher's policy
    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, Harald; Llort Sánchez, Germán; Giménez Lucas, Judit; Labarta Mancho, Jesús José (Springer, 2014)
    Conference report
    Restricted access - publisher's policy
    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 ...
  • Dual-level parallelism exploitation with OpenMP in coastal ocean circulation modeling 

    González Tallada, Marc; Ayguadé Parra, Eduard; Martorell Bofill, Xavier; Labarta Mancho, Jesús José; Luong, P V (2002-05)
    Article
    Restricted access - publisher's policy
    Two alternative dual-level parallel implementations of the Multiblock Grid Princeton Ocean Model (MGPOM) are compared in this paper. The first one combines the use of two programming paradigms: message passing with the ...
  • Dynamic load balancing for hybrid applications 

    Garcia Gasulla, Marta; Corbalán González, Julita; Labarta Mancho, Jesús José (Barcelona Supercomputing Center, 2015-05-05)
    Conference report
    Open Access
    DLB relies on the usage of hybrid programming models and exploits the malleability of the second level of parallelism to redistribute computation power across processes.
  • Evaluating link prediction on large graphs 

    Garcia Gasulla, Dario; Cortés García, Claudio Ulises; Ayguadé Parra, Eduard; Labarta Mancho, Jesús José (IOS Press, 2015)
    Conference report
    Open Access
    Exploiting network data (i.e., graphs) is a rather particular case of data mining. The size and relevance of network domains justifies research on graph mining, but also brings forth severe complications. Computational ...
  • Evaluating the impact of OpenMP 4.0 extensions on relevant parallel workloads 

    Vidal Ortiz, Raul; Casas Guix, Marc; Moreto Planas, Miquel; Chasapis, Dimitrios; Ferrer Ibáñez, Roger; Martorell Bofill, Xavier; Ayguadé Parra, Eduard; Labarta Mancho, Jesús José; Valero Cortés, Mateo (Springer, 2015)
    Conference report
    Open Access
    OpenMP has been for many years the most widely used programming model for shared memory architectures. Periodically, new features are proposed and some of them are finally selected for inclusion in the OpenMP standard. The ...
  • Evaluation of OpenMP for the Cyclops multithreaded architecture 

    Almasi, G; Ayguadé Parra, Eduard; Cascaval, C; Castaños, J; Labarta Mancho, Jesús José; Martínez, F; Martorell Bofill, Xavier; Moreira, J (2003-06)
    Article
    Restricted access - publisher's policy
    Multithreaded architectures have the potential of tolerating large memory and functional unit latencies and increase resource utilization. The Blue Gene/Cyclops architecture, being developed at the IBM T. J. Watson Research ...
  • Experiences parallelizing a web server with OpenMP 

    Balart Tarzan, Jairo; Duran González, Alejandro; González Tallada, Marc; Martorell Bofill, Xavier; Ayguadé Parra, Eduard; Labarta Mancho, Jesús José (2006-06)
    Article
    Restricted access - publisher's policy
    Multi-threaded web servers are typically parallelized by hand using the pthreads library. OpenMP has rarely been used to parallelize such kind of applications, although we foresee that it can be a great tool for network ...