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International Conference on Simulation and Modeling Methodologies, Technologies and Applications (SIMULTECH)

作者： Irfan Uddin Raphael Poss Chris Jesshope Computer Systems Architecture group University of Amsterdam XH Amsterdam The Netherlands

The simulation of fine-grained latency tolerance based on the dynamic state of the system in high-level simulation of many-core systems is a challenging simulation problem. We have introduced a high-level simulation technique for microthreaded many-core systems based on the assumption that the throughput of the program can always be one cycle per instruction as these systems have fine-grained latency tolerance. However, this assumption is not always true if there are insufficient threads in the pipeline and hence long latency operations are not tolerated. In this paper we introduce Signatures to classify low-level instructions in high-level categories and estimate the performance of basic blocks during the simulation based on the concurrent threads in the pipeline. The simulation of fine-grained latency tolerance improves accuracy in the high-level simulation of many-core systems.

关键词： Instruction sets Throughput Pipelines Microgrids Adaptation models Computational modeling Synchronization

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Analytical-Based High-Level Simulation of the Microthreaded Many-Core architectures

Analytical-Based High-Level Simulation of the Microthreaded ...

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Euromicro Conference on Parallel, Distributed and Network-Based Processing

作者： Irfan Uddin Raphael Poss Chris Jesshope Computer Systems Architecture group Institute for Informatics University of Amsterdam Amsterdam The Netherlands

High-level simulation is becoming commonly used for design space exploration of many-core systems. We have been working on high-level simulation techniques for the microthreaded many-core architecture at the University of Amsterdam. In previous work different levels of high-level simulation for instruction execution have been proposed, where the objective of every level is to keep the highest possible abstraction in order to achieve the least complexity and highest simulation speed with a compromise on the amount of accuracy. In this article we propose a new breakthrough in abstraction by simulating entire components in applications using analytical models. This simulation technique greatly reduces the complexity of the simulator and increases the simulation speed by orders of magnitude compared to the other levels of the high-level simulator, without affecting the simulation accuracy.

关键词： computer architecture Computational modeling Analytical models Throughput Concurrent computing Microgrids Load modeling

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Adaptive video transmission with subjective quality constraints

Adaptive video transmission with subjective quality constrai...

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作者： Chen, Chao Zhu, Xiaoqing De Veciana, Gustavo Bovik, Alan C. Heath, Robert W. Department of Electrical and Computer Engineering University of Texas at Austin AustinTX78712-0240 United States Advanced Architecture and Research Group Cisco Systems San Jose95134CA United States

ISBN: (纸本)9781479957514

We conducted a subjective study wherein we found that viewers' Quality of Experience (QoE) was strongly correlated with the empirical cumulative distribution function (eCDF) of the predicted video quality. Based on this observation, we propose a rate-adaptation algorithm that can incorporate QoE constraints on the empirical cumulative quality distribution per user. Simulation results show that the proposed technique can reduce network resource consumption by 29% over conventional average-quality maximized rate-adaptation algorithms. © 2014 IEEE.

关键词： Distribution functions

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Erratum to: Search for dark matter produced in association with a leptonically decaying Z boson in proton–proton collisions at s = 13 Te

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The European Physical Journal C 2021年第4期81卷 1-16页

作者： A. M. Sirunyan A. Tumasyan W. Adam T. Bergauer M. Dragicevic J. Erö A. Escalante Del Valle R. Frühwirth M. Jeitler N. Krammer L. Lechner D. Liko T. Madlener I. Mikulec F. M. Pitters N. Rad J. Schieck R. Schöfbeck M. Spanring S. Templ W. Waltenberger C.-E. Wulz M. Zarucki V. Chekhovsky A. Litomin V. Makarenko J. Suarez Gonzalez M. R. Darwish E. A. De Wolf D. Di Croce X. Janssen T. Kello A. Lelek M. Pieters H. Rejeb Sfar H. Van Haevermaet P. Van Mechelen S. Van Putte N. Van Remortel F. Blekman E. S. Bols S. S. Chhibra J. D’Hondt J. De Clercq D. Lontkovskyi S. Lowette I. Marchesini S. Moortgat A. Morton Q. Python S. Tavernier W. Van Doninck P. Van Mulders D. Beghin B. Bilin B. Clerbaux G. De Lentdecker B. Dorney L. Favart A. Grebenyuk A. K. Kalsi I. Makarenko L. Moureaux L. Pétré A. Popov N. Postiau E. Starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom L. Wezenbeek T. Cornelis D. Dobur M. Gruchala I. Khvastunov M. Niedziela C. Roskas K. Skovpen M. Tytgat W. Verbeke B. Vermassen M. Vit G. Bruno F. Bury C. Caputo P. David C. Delaere M. Delcourt I. S. Donertas A. Giammanco V. Lemaitre K. Mondal J. Prisciandaro A. Taliercio M. Teklishyn P. Vischia S. Wuyckens J. Zobec G. A. Alves C. Hensel A. Moraes W. L. Aldá Júnior E. Belchior Batista Das Chagas H. BRANDAO MALBOUISSON W. Carvalho J. Chinellato E. Coelho E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao S. Fonseca De Souza J. Martins D. Matos Figueiredo M. Medina Jaime C. Mora Herrera L. Mundim H. Nogima P. Rebello Teles L. J. Sanchez Rosas A. Santoro S. M. Silva Do Amaral A. Sznajder M. Thiel F. Torres Da Silva De Araujo A. Vilela Pereira C. A. Bernardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores D. S. Lemos P. G. Mercadante S. F. Novaes Sandra S. Padula A. Aleksandrov G. Antchev I. Atanasov R. Hadjiiska P. Iaydjiev M. Misheva M. Rodozov M. Shopova G. Sultanov M. Bonchev A. Dimitrov T. Ivanov L. Litov B. Pavlov P. Petkov A. Petrov W. Fang Q. Guo H. Wang L. Yuan M. Ahmad Z. Hu Y. Wang E. Chapon G. M. Chen H. S. Chen M. Chen A. Kapoor D. Leggat H. Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Vienna Austria Vienna University of Technology Vienna Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Department of Basic and Applied Sciences Faculty of Engineering Arab Academy for Science Technology and Maritime Transport Alexandria Egypt Université Libre de Bruxelles Bruxelles Belgium Vrije Universiteit Brussel Brussel Belgium Ghent University Ghent Belgium IRFU CEA Université Paris-Saclay Gif-sur-Yvette France Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual de Campinas Campinas Brazil Federal University of Rio Grande do Sul Porto Alegre Brazil UFMS Nova Andradina Brazil Universidade Federal de Pelotas Pelotas Brazil Universidade Estadual Paulista Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China University of Chinese Academy of Sciences Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Sun Yat-Sen University Guangzhou China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) - Fudan University Shanghai China Zhejiang University Hangzhou China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia Institute for Theoretical and Experimental Physics named by A.I. Alikhanov of NRC ‘K

A Correction to this paper has been published: https://***/10.1140/epjc/s10052-020-08739-5

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ADAPTIVE VIDEO TRANSMISSION WITH SUBJECTIVE QUALITY CONSTRAINTS

ADAPTIVE VIDEO TRANSMISSION WITH SUBJECTIVE QUALITY CONSTRAI...

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IEEE International Conference on Image Processing

作者： Chao Chen Xiaoqing Zhu Gustavo de Veciana Alan C. Bovik Robert W. Heath, Jr. Department of Electrical and Computer Engineering The University of Texas at Austin The Advanced Architecture and Research Group Cisco Systems

ISBN: (纸本)9781479957521

关键词： Quality of Experience Video transport Rate adaptation

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Compiler-assisted checkpointing of parallel codes: The cetus and LLVM experience

Compiler-assisted checkpointing of parallel codes: The cetus...

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作者： Rodríguez, Gabriel Martín, María J. González, Patricia Touriño, Juan Doallo, Ramón Computer Architecture Group Department of Electronics and Systems University of A Coruña A Coruña Spain

With the evolution of high-performance computing, parallel applications have developed an increasing necessity for fault tolerance, most commonly provided by checkpoint and restart techniques. Checkpointing tools are typically implemented at one of two different abstraction levels: at the system level or at the application level. The latter has become an interesting alternative due to its flexibility and the possibility of operating in different environments. However, application-level checkpointing tools often require the user to manually insert checkpoints in order to ensure that certain requirements are met (e.g. forcing checkpoints to be taken at the user code and not inside kernel routines). This paper examines the transformations required to enable automatic checkpointing of parallel applications in the CPPC application-level checkpointing framework. These transformations have been implemented on two very different compiler infrastructures: Cetus and LLVM. Cetus is a Java-based compiler infrastructure aiming to provide an easy to use and clean IR and API for program transformation. LLVM is a low-level, SSA-based toolchain. The fundamental differences of both approaches are analyzed from the structural, behavioral and performance perspectives. © 2012 Springer Science+Business Media New York.

关键词： Message passing

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Designing a control application by using a specialized multi-core soft microprocessor

Designing a control application by using a specialized multi...

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12th IFAC Conference on Programmable Devices and Embedded systems, PDeS 2013

作者： Däne, Bernd Pacholik, Alexander Zschäck, Stephan Fengler, Wolfgang Ament, Christoph Braune, Tobias Computer Architecture and Embedded Systems Group Ilmenau University of Technology 98684 Ilmenau Germany Systems Analysis Group Ilmenau University of Technology 98684 Ilmenau Germany

ISBN: (纸本)9783902823533

Computationally intensive algorithms for closed loop control and similar systems today can be implemented using reconfigurable FPGA devices. One approach is using soft microprocessor designs and implementing the algorithms as programs. This paper reports about a case study within an ongoing project that investigates a multi-core soft microprocessor solution for a closed-loop control application. Requirements within the project lead to a specialized processor design. Some results from experimental work are presented, demonstrating feasibility and efficiency of the approach. © IFAC.

关键词： Signal processing

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Incentives for dynamic and energy-aware capacity allocation for multi-tenant clusters

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10th International Conference on the Economics of Grids, Clouds, systems, and Services, GECON 2013

作者： León, Xavier Navarro, Leandro Distributed Systems Group Department of Computer Architecture Universitat Politècnica de Catalunya Barcelona Spain

ISBN: (纸本)9783319024134

Large scale clusters are now being used in shared, multi-tenant scenarios by heterogeneous applications with completely different requirements. In this scenario, it's useful to explore the intersection of two complementary goals. On one side, energy efficiency is an important factor to consider in this world with increasing operating costs related to energy consumption. On the other side, heterogeneous applications emphasize the problem of distributing the execution capacity among competitive users in a shared setting. In this paper, we address the combination of these two goals by introducing an incentive mechanism to make users report their actual resource requirements, allowing them to dynamically scale-up or down as necessary. In turn, this information is used by the infrastructure operator to shut down resources without reducing the QoS provided to users and effectively reducing energy costs. We show how our mechanism is able to meet the performance requirements of applications without over-provisioning physical resources, which in turn translates into energy savings. © 2013 Springer International Publishing.

关键词： Operating costs

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MGSim-A simulation environment for multi-core research and education

MGSim-A simulation environment for multi-core research and e...

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2013 13th International Conference on Embedded computer systems: architectures, Modeling and Simulation, IC-SAMOS 2013

作者： Poss, Raphael Lankamp, Mike Yang, Qiang Fu, Jian Uddin, Man Jesshope, Chris R. University of Amsterdam Computer Systems Architecture Group Science Park 904 1098XH Amsterdam Netherlands

ISBN: (纸本)9781479901036

This article presents MGSim1, an open source discrete event simulator for on-chip hardware components developed at the University of Amsterdam. MGSim is used as research and teaching vehicle to study the fine-grained hardware/software interactions on many-core chips with and without hardware multithreading. MGSim's component library includes support for core models with different instruction sets, a configurable interconnect, multiple configurable cache and memory models, a dedicated I/O subsystem, and comprehensive monitoring and interaction facilities. The default model configuration shipped with MGSim implements Microgrids, a multi-core architecture with hardware concurrency management. MGSim is furthermore written mostly in C++ and uses object classes to represent chip components. It is optimized for architecture models that can be described as process networks. © 2013 IEEE.

关键词： C++ (programming language)

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Reducing the depth of quantum circuits using additional circuit lines

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5th International Conference on Reversible Computation, RC 2013

作者： Abdessaied, Nabila Wille, Robert Soeken, Mathias Drechsler, Rolf Institute of Computer Science University of Bremen Group of Computer Architecture D-28359 Bremen Germany Cyber-Physical Systems DFKI GmbH D-28359 Bremen Germany

ISBN: (纸本)9783642389856

The synthesis of Boolean functions, as they are found in many quantum algorithms, is usually conducted in two steps. First, the function is realized in terms of a reversible circuit followed by a mapping into a corresponding quantum realization. During this process, the number of lines and the quantum costs of the resulting circuits have mainly been considered as optimization objectives thus far. However, beyond that also the depth of a quantum circuit is vital. Although first synthesis approaches that consider depth have recently been introduced, the majority of design methods did not consider this metric. In this paper, we introduce an optimization approach aiming for the reduction of depth in the process of mapping a reversible circuit into a quantum circuit. For this purpose, we present an improved (local) mapping of single gates as well as a (global) optimization scheme considering the whole circuit. In both cases, we incorporate the idea of exploiting additional circuit lines which are used in order to split a chain of serial gates. Our optimization techniques enable a concurrent application of gates which significantly reduces the depth of the circuit. Experiments show that reductions of approx. 40% on average can be achieved when following this scheme. © 2013 Springer-Verlag Berlin Heidelberg.

关键词： Mapping

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