Ara es mostren els items 1-20 de 52

  • A highly scalable parallel implementation of H.264 

    Azevedo, Arnaldo; Juurlink, Ben; Meenderinck, Cor; Terechko, Andrei; Hoogerbrugge, Jan; Álvarez Mesa, Mauricio; Ramírez Bellido, Alejandro; Valero Cortés, Mateo (Springer Verlag, 2009-09-21)
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    Developing parallel applications that can harness and efficiently use future many-core architectures is the key challenge for scalable computing systems. We contribute to this challenge by presenting a parallel implementation ...
  • A performance perspective on energy efficient HPC links 

    Saravanan, Karthikeyan P.; Carpenter, Paul; Ramírez Bellido, Alejandro (Association for Computing Machinery (ACM), 2014)
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    Energy costs are an increasing part of the total cost of ownership of HPC systems. As HPC systems become increasingly energy proportional in an effort to reduce energy costs, interconnect links stand out for their inefficiency. ...
  • A polymorphic register file for matrix operations 

    Ciobanu, Catalin; Kuzmanov, Georgi; Gaydadjiev, Georgi; Ramírez Bellido, Alejandro (IEEE Computer Society Publications, 2010)
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    Previous vector architectures divided the available register file space in a fixed number of registers of equal sizes and shapes. We propose a register file organization which allows dynamic creation of a variable number ...
  • A streaming machine description and programming model 

    Carpenter, Paul; Ródenas Picó, David; Martorell Bofill, Xavier; Ramírez Bellido, Alejandro; Ayguadé Parra, Eduard (2007-07)
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    In this paper we present the initial development of a streaming environment based on a programming model and machine description. The stream programming model consists of an extension to the C language and it’s translation ...
  • ACOTES project: Advanced compiler technologies for embedded streaming 

    Duranton, M.; Munk, H.; Ayguadé Parra, Eduard; Bastoul, C.; Carpenter, Paul; Chamski, Z.; Cohen, A.; Cornero, M.; Dumont, P.; Pop, S.; Pop, A.; Ornstein, A.; Nuzman, D.; Miranda, C.; Martorell Bofill, Xavier; Lindwer, M.; Ladelsky, R.; Ferrer, Roger; Fellahi, M.; Pouchet, L. N; Zaks, A.; Shvadron, U.; Trifunovic, K.; Rohou, E.; Rosen, I.; Ramírez Bellido, Alejandro; Ródenas, D. (2011-04)
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    Streaming applications are built of data-driven, computational components, consuming and producing unbounded data streams. Streaming oriented systems have become dominant in a wide range of domains, including embedded ...
  • Archexplorer for automatic design space exploration 

    Desmet, V.; Girbal, Sylvain; Ramírez Bellido, Alejandro; Temam, Olivier; Vega, Augusto (2010-09-09)
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    Growing architectural complexity and stringent time-to-market constraints suggest the need to move architecture design beyond parametric exploration to structural exploration. ArchExplorer is a Web-based permanent and open ...
  • Author retrospective for "Software trace cache" 

    Ramírez Bellido, Alejandro; Falcón Samper, Ayose Jesus; Santana Jaria, Oliverio J.; Valero Cortés, Mateo (Association for Computing Machinery (ACM), 2014)
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    In superscalar processors, capable of issuing and executing multiple instructions per cycle, fetch performance represents an upper bound to the overall processor performance. Unless there is some form of instruction re-use ...
  • Buffer sizing for self-timed stream programs on heterogeneous distributed memory multiprocessors 

    Carpenter, Paul; Ramírez Bellido, Alejandro; Ayguadé Parra, Eduard (Springer Verlag, 2010)
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    Stream programming is a promising way to expose concurrency to the compiler. A stream program is built from kernels that communicate only via point-to-point streams. The stream compiler statically allocates these kernels ...
  • COMalaWEB: plataforma basada en noves tecnologies aplicades a la docència 

    Fernández Rubio, Juan Antonio; Fernández Prades, Carlos; Ramírez Bellido, Alejandro; Cabrera Beán, Margarita Asuncion; Pomar Berry, Christian (2005-02)
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    Les possibilitats que ens ofereixen les noves tecnologies de la informació aplicades a l’àmbit de la docència és un tema encara no prou ben explotat. Aquest projecte pretén investigar aquests conceptes mitjançant la creació ...
  • Comparing last-level cache designs for CMP architectures 

    Vega, Augusto; Rico Carro, Alejandro; Cabarcas, Felipe; Ramírez Bellido, Alejandro; Valero Cortés, Mateo (2010)
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    The emergence of hardware accelerators, such as graphics processing units (GPUs), has challenged the interaction between processing elements (PEs) and main memory. In architectures like the Cell/B.E. or GPUs, the PEs ...
  • Data placement in HPC architectures with heterogeneous off-chip memory 

    Pavlovic, Milan; Puzovic, Nikola; Ramírez Bellido, Alejandro (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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    The performance of HPC applications is often bounded by the underlying memory system's performance. The trend of increasing the number of cores on a chip imposes even higher memory bandwidth and capacity requirements. The ...
  • Enabling preemptive multiprogramming on GPUs 

    Tanasic, Ivan; Gelado Fernandez, Isaac; Cabezas, Javier; Ramírez Bellido, Alejandro; Navarro, Nacho; Valero Cortés, Mateo (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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    GPUs are being increasingly adopted as compute accelerators in many domains, spanning environments from mobile systems to cloud computing. These systems are usually running multiple applications, from one or several users. ...
  • Energy efficiency vs. performance of the numerical solution of PDEs: an application study on a low-power ARM-based cluster 

    Göddeke, Dominik; Komatitsch, D.; Geveler, Markus; Ribbrock, D.; Rajovic, Nikola; Puzovic, Nikola; Ramírez Bellido, Alejandro (2013-03-05)
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    Power consumption and energy efficiency are becoming critical aspects in the design and operation of large scale HPC facilities, and it is unanimously recognised that future exascale supercomputers will be strongly constrained ...
  • Energy efficient HPC on embedded SoCs : optimization techniques for mali GPU 

    Grasso, Ivan; Radojkovic, Petar; Rajovic, Nikola; Gelado Fernandez, Isaac; Ramírez Bellido, Alejandro (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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    A lot of effort from academia and industry has been invested in exploring the suitability of low-power embedded technologies for HPC. Although state-of-the-art embedded systems-on-chip (SoCs) inherently contain GPUs that ...
  • Enlarging instruction streams 

    Santana Jaria, Oliverio J.; Ramírez Bellido, Alejandro; Valero Cortés, Mateo (2007-10)
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    The stream fetch engine is a high-performance fetch architecture based on the concept of an instruction stream. We call a sequence of instructions from the target of a taken branch to the next taken branch, potentially ...
  • Evaluating execution time predictability of task-based programs on multi-core processors 

    Grass, Thomas Dieter; Rico Carro, Alejandro; Casas Guix, Marc; Moretó Planas, Miquel; Ramírez Bellido, Alejandro (Springer, 2015)
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    Task-based programming models are becoming increasingly important, as they can reduce the synchronization costs of parallel programs on multi-cores. Instances of the same task type in task-based programs consist of the ...
  • Experiences with mobile processors for energy efficient HPC 

    Rajovic, Nikola; Rico Carro, Alejandro; Vipond, James; Gelado Fernandez, Isaac; Puzovic, Nikola; Ramírez Bellido, Alejandro (2013)
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    The performance of High Performance Computing (HPC) systems is already limited by their power consumption. The majority of top HPC systems today are built from commodity server components that were designed for maximizing ...
  • Explaining dynamic cache partitioning speed ups 

    Moreto Planas, Miquel; Cazorla, Francisco; Ramírez Bellido, Alejandro; Valero Cortés, Mateo (2007-01)
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    Cache partitioning has been proposed as an interesting alternative to traditional eviction policies of shared cache levels in modern CMP architectures: throughput is improved at the expense of a reasonable cost. However, ...
  • Exploiting different levels of parallelism in the biological sequence comparison problem 

    Sánchez Castaño, Friman; Ramírez Bellido, Alejandro; Valero Cortés, Mateo (2009-04-23)
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    In the last years the fast growth of bioinformatics field has atracted the attention of computer scientists. At the same time, de exponential growth of databases that contains biological information (such as protein and ...
  • High performance instruction fetch using software and hardware co-design 

    Ramírez Bellido, Alejandro (Universitat Politècnica de Catalunya, 2002-07-12)
    Tesi
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    En los últimos años, el diseño de procesadores de altas prestaciones ha progresado a lo largo de dos corrientes de investigación: incrementar la profundidad del pipeline para permitir mayores frecuencias de reloj, y ensanchar ...