Now showing items 1-20 of 48

  • 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)
    Article
    Restricted access - publisher's policy
    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 M.; Ramírez Bellido, Alejandro (Association for Computing Machinery (ACM), 2014)
    Conference lecture
    Restricted access - publisher's policy
    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)
    Conference report
    Open Access
    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)
    Article
    Restricted access - publisher's policy
    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)
    Article
    Open Access
    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)
    Article
    Open Access
    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)
    Conference report
    Open Access
    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)
    Conference report
    Restricted access - publisher's policy
    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)
    Conference report
    Open Access
    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)
    Conference report
    Restricted access - publisher's policy
    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)
    Conference report
    Restricted access - publisher's policy
    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 Mas, Nacho; Valero Cortés, Mateo (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    Conference report
    Open Access
    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)
    Article
    Restricted access - publisher's policy
    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)
    Conference report
    Restricted access - publisher's policy
    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 ...
  • 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)
    Conference report
    Restricted access - publisher's policy
    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)
    Conference report
    Restricted access - publisher's policy
    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 ...
  • Exploiting different levels of parallelism in the biological sequence comparison problem 

    Sánchez Castaño, Friman; Ramírez Bellido, Alejandro; Valero Cortés, Mateo (2009-04-23)
    Conference report
    Open Access
    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)
    Doctoral thesis
  • Interleaving granularity on high bandwidth memory architecture for CMPs 

    Cabarcas, Felipe; Rico Carro, Alejandro; Etsion, Yoav; Ramírez Bellido, Alejandro (IEEE Computer Society Publications, 2010)
    Conference report
    Open Access
    Memory bandwidth has always been a critical factor for the performance of many data intensive applications. The increasing processor performance, and the advert of single chip multiprocessors have increased the memory ...
  • Long DNA sequence comparison on multicore architectures 

    Sánchez Castaño, Friman; Cabarcas, Felipe; Ramírez Bellido, Alejandro; Valero Cortés, Mateo (Springer Verlag, 2010)
    Conference report
    Restricted access - publisher's policy
    Biological sequence comparison is one of the most important tasks in Bioinformatics. Due to the growth of biological databases, sequence comparison is becoming an important challenge for high performance computing, ...