Now showing items 1-20 of 21

    • A scalable synthetic traffic model of Graph500 for computer networks analysis 

      Fuentes Sáez, Pablo; Benito, Mariano; Vallejo, Enrique; Bosque Orero, José Luis; Beivide Palacio, Ramon; Anghel, Andreea; Rodríguez Herrera, Germán; Gusat, Mitch; Minkenberg, Cyriel; Valero Cortés, Mateo (2017-12-25)
      Article
      Open Access
      The Graph500 benchmark attempts to steer the design of High-Performance Computing systems to maximize the performance under memory-constricted application workloads. A realistic simulation of such benchmarks for architectural ...
    • Architectural support for task dependence management with flexible software scheduling 

      Castillo, Emilio; Álvarez Martí, Lluc; Moreto Planas, Miquel; Casas, Marc; Vallejo, Enrique; Bosque, Jose L.; Beivide Palacio, Ramon; Valero Cortés, Mateo (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Conference report
      Open Access
      The growing complexity of multi-core architectures has motivated a wide range of software mechanisms to improve the orchestration of parallel executions. Task parallelism has become a very attractive approach thanks to its ...
    • Auto-tuned OpenCL kernel co-execution in OmpSs for heterogeneous systems 

      Pérez, Borja; Stafford, Esteban; Bosque Orero, José Luis; Beivide Palacio, Ramon; Mateo Bellido, Sergi; Teruel García, Xavier; Martorell Bofill, Xavier; Ayguadé Parra, Eduard (2019-03-01)
      Article
      Open Access
      The emergence of heterogeneous systems has been very notable recently. The nodes of the most powerful computers integrate several compute accelerators, like GPUs. Profiting from such node configurations is not a trivial ...
    • Characterizing the communication demands of the Graph500 benchmark on a commodity cluster 

      Fuentes, Pablo; Bosque Orero, José Luis; Beivide Palacio, Ramon; Valero Cortés, Mateo; Minkenberg, Cyriel (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Open Access
      Big Data applications have gained importance over the last few years. Such applications focus on the analysis of huge amounts of unstructured information and present a series of differences with traditional High Performance ...
    • Diameter minimization in networks for SIMD machines 

      Beivide Palacio, Ramon; Balcázar Navarro, José Luis (1985)
      External research report
      Open Access
      We propose an algebraic constructive method which allows to find a certain kind of networks having optimal diameter. These interconnection networks have been proposed for SIMD machines. We compare the results with other ...
    • Extending OmpSs for OpenCL kernel co-execution in heterogeneous systems 

      Pérez, Borja; Stafford, Esteban; Bosque, Jose L.; Beivide Palacio, Ramon; Mateo, Sergi; Teruel, Xavier; Martorell Bofill, Xavier; Ayguadé Parra, Eduard (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Conference report
      Open Access
      Heterogeneous systems have a very high potential performance but present difficulties in their programming. OmpSs is a well known framework for task based parallel applications, which is an interesting tool to simplify the ...
    • FlexVC: Flexible virtual channel management in low-diameter networks 

      Fuentes, Pablo; Vallejo, Enrique; Beivide Palacio, Ramon; Minkenberg, Cyriel; Valero Cortés, Mateo (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Conference report
      Open Access
      Deadlock avoidance mechanisms for lossless lowdistance networks typically increase the order of virtual channel (VC) index with each hop. This restricts the number of buffer resources depending on the routing mechanism and ...
    • Implementing Kilo-Instruction multiprocessors 

      Vallejo, Enrique; Galluzzi, Marco; Cristal Kestelman, Adrián; Vallejo, Fernando; Beivide Palacio, Ramon; Stenström, Per; Smith, James E.; Valero Cortés, Mateo (Institute of Electrical and Electronics Engineers (IEEE), 2004)
      Conference report
      Open Access
      Multiprocessors are coming into wide-spread use in many application areas, yet there are a number of challenges to achieving a good tradeoff between complexity and performance. For example, while implementing memory coherence ...
    • Implementing kilo-instruction multiprocessors 

      Vallejo, Enrique; Galluzzi, Marco; Cristal Kestelman, Adrián; Vallejo, Fernando; Beivide Palacio, Ramon; Stenström, Per; Smith, James E.; Valero Cortés, Mateo (2005)
      External research report
      Open Access
      Multiprocessors are coming into wide-spread use in many application areas, yet there are a number of challenges to achieving a good tradeoff between complexity and performance. For example, while implementing memory coherence ...
    • Implicit transactional memory in chip multiprocessors 

      Galluzzi, Marco; Vallejo, Enrique; Cristal Kestelman, Adrián; Vallejo, Fernando; Beivide Palacio, Ramon; Stenström, Per; Smith, James E.; Valero Cortés, Mateo (2007-06)
      External research report
      Open Access
      Chip Multiprocessors (CMPs) are an efficient way of designing and use the huge amount of transistors on a chip. Different cores on a chip can compose a shared memory system with a very low-latency interconnect at a very ...
    • Interconnection networks in petascale computer systems: A survey 

      Trobec, Roman; Vasiljevic, Radivoje; Tomasevic, Milo; Milutinovic, Veljko; Beivide Palacio, Ramon; Valero Cortés, Mateo (2016-11)
      Article
      Restricted access - publisher's policy
      This article provides background information about interconnection networks, an analysis of previous developments, and an overview of the state of the art. The main contribution of this article is to highlight the importance ...
    • Network unfairness in dragonfly topologies 

      Fuentes, Pablo; Vallejo, Enrique; Camarero, Cristóbal; Beivide Palacio, Ramon; Valero Cortés, Mateo (2016-12)
      Article
      Open Access
      Dragonfly networks arrange network routers in a two-level hierarchy, providing a competitive cost-performance solution for large systems. Non-minimal adaptive routing (adaptive misrouting) is employed to fully exploit the ...
    • Oblivious routing schemes in extended generalized fat tree networks 

      Rodríguez Herrera, Germán; Minkenberg, Cyriel; Beivide Palacio, Ramon; Luijten, Ronald P.; Labarta Mancho, Jesús José; Valero Cortés, Mateo (IEEE Computational Intelligence Society, 2009)
      Conference report
      Open Access
      A family of oblivious routing schemes for fat trees and their slimmed versions is presented in this work. First, two popular oblivious routing algorithms, which we refer to as S-mod-k and D-mod-k, are analyzed in detail. ...
    • OFAR-CM: Efficient Dragonfly networks with simple congestion management 

      García, Marina; Vallejo, Enrique; Beivide Palacio, Ramon; Valero Cortés, Mateo; Rodríguez, Germán (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Conference report
      Open Access
      Dragonfly networks are appealing topologies for large-scale Data center and HPC networks, that provide high throughput with low diameter and moderate cost. However, they are prone to congestion under certain frequent traffic ...
    • Optimal distance networks of low degree for parallel computers 

      Beivide Palacio, Ramon; Herrada Lillo, Enrique; Balcázar Navarro, José Luis; Arruabarrena, Agustín (1989)
      External research report
      Open Access
      We introduce and study a family of interconnection schemes, the Midimew networks, based on circulant graphs of degree 4. A family of such circulants is determined and shown to be optimal with respect to two distance ...
    • Solving multiprocessor drawbacks with kilo-instruction processors 

      Vallejo, Enrique; Galluzzi, Marco; Cristal Kestelman, Adrián; Vallejo, Fernando; Beivide Palacio, Ramon; Stenström, Per; Smith, James E.; Valero Cortés, Mateo (2005)
      External research report
      Open Access
      Nowadays, a good multiprocessor system design has to deal with many drawbacks in order to achieve a good tradeoff between complexity and performance. For example, while solving problems like coherence and consistency is ...
    • The Mont-Blanc prototype: an alternative approach for high-performance computing systems 

      Rajovic, Nikola; Ramírez Bellido, Alejandro; Rico, Alejandro; Mantovani, Filippo; Ruiz, Daniel; Villarubi, Oriol; Gómez, Constantino; Backes, Luna; Nieto, Diego; Servat, Harald; Martorell Bofill, Xavier; Labarta Mancho, Jesús José; Ayguadé Parra, Eduard; Valero Cortés, Mateo; Adeniyi-Jones, Chris; Derradji, Said; Gloaguen, Hervé; Lanucara, Piero; Sanna, Nico; Mehaut, Jean-François; Pouget, Kevin; Videau, Brice; Boyer, Eric; Allalen, Momme; Auweter, Axel; Brayford, David; Tafani, Daniele; Brömmel, Dirk; Halver, René; Meinke, Jan H.; Beivide Palacio, Ramon; Benito, Mariano; Vallejo, Enrique (2016)
      External research report
      Open Access
      High-performance computing (HPC) is recognized as one of the pillars for further advance of science, industry, medicine, and education. Current HPC systems are being developed to overcome emerging challenges in order to ...
    • The Mont-Blanc prototype: an alternative approach for HPC systems 

      Rajovic, Nikola; Rico, Alejandro; Mantovani, Filippo; Ruiz, Daniel; Vlarrubi, Josep O.; Gomez, Constantino; Backes, Luna; Nieto, Diego; Servat, Harald; Martorell Bofill, Xavier; Labarta Mancho, Jesús José; Ayguadé Parra, Eduard; Adeniyi-Jones, Chris; Derradji, Said; Gloaguen, Hervé; Lanucara, Piero; Sanna, Nico; Mehaut, Jean-François; Pouget, Kevin; Videau, Brice; Boyer, Eric; Allalen, Momme; Auweter, Axel; Brayford, David; Tafani, Daniele; Weinberg, Volker; Brömmel, Dirk; Halver, René; Meinke, Jan H.; Beivide Palacio, Ramon; Benito, Mariano; Vallejo, Enrique; Valero Cortés, Mateo; Ramirez, Alex (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Conference report
      Open Access
      High-performance computing (HPC) is recognized as one of the pillars for further progress in science, industry, medicine, and education. Current HPC systems are being developed to overcome emerging architectural challenges ...
    • Throughput unfairness in Dragonfly networks under realistic traffic patterns 

      Fuentes, Pablo; Vallejo, Enrique; Camarero, Cristóbal; Beivide Palacio, Ramon; Valero Cortés, Mateo (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Conference report
      Open Access
      Dragonfly networks have a two-level hierarchical arrangement of the network routers, and allow for a competitive cost-performance solution in large systems. Non-minimal adaptive routing is employed to fully exploit the ...
    • To distribute or not to distribute: The question of load balancing for performance or energy 

      Stafford, Esteban; Pérez, Borja; Bosque, Jose L.; Beivide Palacio, Ramon; Valero Cortés, Mateo (Springer, 2017)
      Conference report
      Open Access
      Heterogeneous systems are nowadays a common choice in the path to Exascale. Through the use of accelerators they offer outstanding energy efficiency. The programming of these devices employs the host-device model, which ...