Exploració per autor "Unsal, Osman Sabri"

Ara es mostren els items 41-60 de 108

    • Experimental study of aggressive undervolting in FPGAs 

      Salami, Behzad; Unsal, Osman Sabri; Cristal Kestelman, Adrián (Barcelona Supercomputing Center, 2019-05-07)
      Text en actes de congrés
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      In this work, we evaluate aggressive undervolting, i.e., voltage scaling below the nominal level to reduce the energy consumption of Field Programmable Gate Arrays (FPGAs). Usually, voltage guardbands are added by chip ...

    • Exploiting narrow values for soft error tolerance 

      Ergin, Oguz; Unsal, Osman Sabri; Vera Rivera, Francisco Javier; González Colás, Antonio María (2006-07)
      Article
      Accés obert
      Soft errors are an important challenge in contemporary microprocessors. Particle hits on the components of a processor are expected to create an increasing number of transient errors with each new microprocessor generation. ...

    • Exploring the capabilities of support vector machines in detecting silent data corruptions 

      Subasi, Omer; Di, Sheng; Bautista-Gomez, Leonardo; Balaprakash, Prasanna; Unsal, Osman Sabri; Labarta Mancho, Jesús José; Cristal Kestelman, Adrián; Krishnamoorthy, Sriram; Cappello, Franck (Elsevier, 2018-09)
      Article
      Accés obert
      As the exascale era approaches, the increasing capacity of high-performance computing (HPC) systems with targeted power and energy budget goals introduces significant challenges in reliability. Silent data corruptions ...

    • FaulTM: Error detection and recovery using hardware transactional memory 

      Yalcin, Gulay; Unsal, Osman Sabri; Cristal Kestelman, Adrián (2013)
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      Accés restringit per política de l'editorial
      Reliability is an essential concern for processor designers due to increasing transient and permanent fault rates. Executing instruction streams redundantly in chip multi processors (CMP) provides high reliability since ...

    • FaulTM: Fault-tolerance using hardware transactional memory 

      Yalcin, Gulay; Unsal, Osman Sabri; Hur, Ibrahim; Cristal Kestelman, Adrián; Valero Cortés, Mateo (2010)
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      Fault-tolerance has become an essential concern for processor designers due to increasing soft-error rates. In this study, we are motivated by the fact that Transactional Memory (TM) hardware provides an ideal base upon ...

    • FIMSIM: A fault injection infrastructure for microarchitectural simulators 

      Yalcin, Gulay; Unsal, Osman Sabri; Cristal Kestelman, Adrián; Valero Cortés, Mateo (2011)
      Report de recerca
      Accés obert
      Fault injection is a widely used approach for experiment-based dependability evaluation in which faults can be injected to the hardware, to the simulator or to the software. Simulation based fault injection is more appealing ...

    • FPGA checkpointing for scientific computing 

      Perelló Bacardit, Marc; Bautista Gomez, Leonardo; Unsal, Osman Sabri (Institute of Electrical and Electronics Engineers (IEEE), 2021)
      Comunicació de congrés
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      The use of FPGAs in computational workloads is becoming increasingly popular due to the flexibility of these devices in comparison to ASICs, and their low power consumption compared to GPUs and CPUs. However, scientific ...

    • From plasma to beefarm: Design experience of an FPGA-based multicore prototype 

      Sonmez, Nehir; Arcas Abella, Oriol; Sayilar, Gokhan; Unsal, Osman Sabri; Cristal Kestelman, Adrián; Hur, Ibrahim; Singh, Satnam; Valero Cortés, Mateo (Springer, 2011)
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      In this paper, we take a MIPS-based open-source uniprocessor soft core, Plasma, and extend it to obtain the Beefarm infrastructure for FPGA-based multiprocessor emulation, a popular research topic of the last few years ...

    • Fuse: A technique to anticipate failures due to degradation in ALUs 

      Abella Ferrer, Jaume; Vera Rivera, Francisco Javier; Unsal, Osman Sabri; Ergin, Oguz; González Colás, Antonio María (Institute of Electrical and Electronics Engineers (IEEE), 2007)
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      This paper proposes the fuse, a technique to anticipate failures due to degradation in any ALU (arithmetic logic unit), and particularly in an adder. The fuse consists of a replica of the weakest transistor in the adder ...

    • Future vector microprocessor extensions for data aggregations 

      Hayes, Timothy; Palomar, Oscar; Unsal, Osman Sabri; Cristal Kestelman, Adrián; Valero Cortés, Mateo (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Comunicació de congrés
      Accés obert
      As the rate of annual data generation grows exponentially, there is a demand to aggregate and summarise vast amounts of information quickly. In the past, frequency scaling was relied upon to push application throughput. ...

    • Ground-truth prediction to accelerate soft-error impact analysis for iterative methods 

      Mutlu, Burcu O.; Kestor, Gokcen; Cristal Kestelman, Adrián; Unsal, Osman Sabri; Krishnamoorthy, Sriram (Institute of Electrical and Electronics Engineers (IEEE), 2019)
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      Understanding the impact of soft errors on applications can be expensive. Often, it requires an extensive error injection campaign involving numerous runs of the full application in the presence of errors. In this paper, ...

    • Hardware scheduling algorithms for asymmetric single-ISA CMPs 

      Markovic, Nikola; Nemirovsky, Daniel; Unsal, Osman Sabri; Valero Cortés, Mateo; Cristal Kestelman, Adrián (Barcelona Supercomputing Center, 2015-05-05)
      Text en actes de congrés
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      As thread level parallelism in applications has continued to expand, so has research in chip multi-core processors. Since more and more applications become multi-threaded we expect to find a growing number of threads ...

    • Hardware transactional memory with software-defined conflicts 

      Titos Gil, Rubén; Acacio, Manuel E.; García, José M.; Harris, Tim; Cristal Kestelman, Adrián; Unsal, Osman Sabri; Hur, Ibrahim; Valero Cortés, Mateo (2010)
      Text en actes de congrés
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      In this paper we propose conflict-defined blocks, a programming language construct that allows programmers to change the concept of conflict from one transaction to another, or even throughout the course of the same ...

    • HARP: Adaptive abort recurrence prediction for Hardware Transactional Memory 

      Armejach Sanosa, Adrià; Negi, Anurag; Cristal Kestelman, Adrián; Unsal, Osman Sabri; Stenström, Per; Harris, Tim (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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      Hardware Transactional Memory (HTM) exposes parallelism by allowing possibly conflicting sections of code, called transactions, to execute concurrently in multithreaded applications. However, conflicts among concurrent ...

    • Hybrid transactional memory to accelerate safe lock-based transactions 

      Vallejo, Enrique; Harris, Tim; Cristal Kestelman, Adrián; Unsal, Osman Sabri; Valero Cortés, Mateo (Association for Computing Machinery (ACM), 2008)
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      To reduce the overhead of Software Transactional Memory (STM) there are many recent proposals to build hybrid systems that use architectural support either to accelerate parts of a particular STM algorithm (Ha-TM), or ...

    • Hybrid transactional memory with pessimistic concurrency control 

      Vallejo, Enrique; Sanyal, Sutirtha; Harris, Tim; Vallejo, Fernando; Beivide, Ramón; Unsal, Osman Sabri; Cristal Kestelman, Adrián; Valero Cortés, Mateo (2011-06)
      Article
      Accés restringit per política de l'editorial
      Transactional Memory (TM) intends to simplify the design and implementation of the shared-memory data structures used in parallel software. Many Software TM systems are based on writer-locks to protect the data being ...

    • Impact of parameter variations on circuits and microarchitecture 

      Unsal, Osman Sabri; Tschanz, James W.; Bowman, Keith; De, Vivek; Vera Rivera, Francisco Javier; González Colás, Antonio María; Ergin, Oguz (2006-12)
      Article
      Accés obert
      Parameter variations, which are increasing along with advances in process technologies, affect both timing and power. Variability must be considered at both the circuit and microarchitectural design levels to keep pace ...

    • Implications of non-volatile memory as primary storage for database management systems 

      Ul Mustafa, Naveed; Armejach Sanosa, Adrià; Ozturk, Ozcan; Cristal Kestelman, Adrián; Unsal, Osman Sabri (IEEE, 2017-01-19)
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      Traditional Database Management System (DBMS) software relies on hard disks for storing relational data. Hard disks are cheap, persistent, and offer huge storage capacities. However, data retrieval latency for hard disks ...

    • Imposing coarse-grained reconfiguration to general purpose processors 

      Duric, Milovan; Stanic, Milan; Ratkovic, Ivan; Palomar Pérez, Óscar; Unsal, Osman Sabri; Cristal Kestelman, Adrián; Valero Cortés, Mateo; Smith, Aaron (Institute of Electrical and Electronics Engineers (IEEE), 2015)
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      Mobile devices execute applications with diverse compute and performance demands. This paper proposes a general purpose processor that adapts the underlying hardware to a given workload. Existing mobile processors need to ...

    • Improving the energy efficiency of hardware-assisted watchpoint systems 

      Karakostas, Vasileios; Tomić, Saša; Unsal, Osman Sabri; Nemirovsky, Mario; Cristal Kestelman, Adrián (2013)
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      Accés restringit per política de l'editorial
      Hardware-assisted watchpoint systems enhance the execution of numerous dynamic software techniques, such as memory protection, module isolation, deterministic execution, and data race detection. In this paper, we show ...