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IATAC: A Smart Predictor to Turn-Off L2 Cache Lines

ACM Transactions on architecture and Code Optimization 2005年第1期2卷 55-77页

作者： Abella, Jaume Gonzaález, Antonio Vera, Xavier Computer Architecture Department Universitat Politècnica de Catalunya-Barcelona Jordi Girona 1-3 Barcelona 08034 Spain Intel Barcelona Research Center Intel Labs UPC Jordi Girona 29 Barcelona 08034 Spain Institute for Computing Systems Architecture School of Informatics University of Edinburgh Edinburgh United Kingdom

As technology evolves, power dissipation increases and cooling systems become more complex and expensive. There are two main sources of power dissipation in a processor: dynamic power and leakage. Dynamic power has been the most significant factor, but leakage will become increasingly significant in future. It is predicted that leakage will shortly be the most significant cost as it grows at about a 5× rate per generation. Thus, reducing leakage is essential for future processor design. Since large caches occupy most of the area, they are one of the leakiest structures in the chip and hence, a main source of energy consumption for future processors. This paper introduces IATAC (inter-access time per access count), a new hardware technique to reduce cache leakage for L2 caches. IATAC dynamically adapts the cache size to the program requirements turning off cache lines whose content is not likely to be reused. Our evaluation shows that this approach outperforms all previous state-of-the-art techniques. IATAC turns off 65% of the cache lines across different L2 cache configurations with a very small performance degradation of around 2%. © 2005, ACM. All rights reserved.

关键词： Cache memories Design L2 cache Low power Performance Turning off cache lines

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Ubiquitous computing for health and medicine

Ubiquitous computing for health and medicine

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IFIP TC8 WG 8.2 International Working Conference on Designing Ubiquitous Information Environments: Socio-Technical Issues and Challenges

作者： Atkinson, Chris Kaplan, Bonnie Larson, Kent Martins, Henrique M. G. Lundell, Jay Harris, Martin Centre for Research in Systems in Information Systems The University of Manchester Manchester United Kingdom Yale Center for Medical Informatics Yale University New Haven CT United States School of Architecture and Planning Massachusetts Institute of Technology Cambridge MA United States Judge Institute of Management University of Cambridge Cambridge United Kingdom Proactive Health Group Intel Corporation Hillsboro OR United States Cleveland Clinic Cleveland OH United States

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System evolution tracking through execution trace analysis

System evolution tracking through execution trace analysis

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IEEE Workshop on Program Comprehension

作者： M. Fischer J. Oberleitner H. Gall T. Gschwind Distributed Systems Group Information Systems Institute Technical University of of Vienna Vienna Austria Department of Informatics s.e.a.l.-Software Evolution & Architecture Laboratory University of Zurich Switzerland Research Laboratory IBM Zurich Research Laboratory Ruschlikon Switzerland

Execution traces produced from instrumented code reflect a system's actual implementation. This information can be used to recover interaction patterns between different entities such as methods, files, or modules. Some solutions for the detection of patterns and their visualization exist, but are limited to small amounts of data and are incapable of comparing data from different versions of a large software system. In this paper, we propose a methodology to analyze and compare the execution traces of different versions of a software system to provide insights into its evolution. We recover high-level module views that facilitate the comprehension of each module's evolution. Our methodology allows us to track the evolution of particular modules and present the findings in three different kinds of visualizations. Based on these graphical representations, the evolution of the concerned modules can be tracked and comprehended much more effectively. Our EvoTrace approach uses standard database technology and instrumentation facilities of development tools, so exchanging data with other analysis tools is facilitated. Further, we show the applicability of our approach using the Mozilla open source system consisting of about 2 million lines of C/C++ code.

关键词： Software systems Instruments Data visualization Performance analysis Information analysis Explosions Information systems informatics computer architecture Laboratories

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DMC - Distributed and Mobile Collaboration Workshop Report

DMC - Distributed and Mobile Collaboration Workshop Report

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IEEE International Workshop on Enabling Technologies: Infrastructure for Collaborative Enterprises (WET ICE)

作者： S. Dustdar H. Gall N. Mehandjiev S. Tata Distributed Systems Group University of Technology Vienna Austria Institut für Informatik Universität Zürich Switzerland School of Informatics University of Manchester Institute of Science and Technology UK Department of Computer Science GET/INT Evry France

The increased need for people and organizations to continue collaborating whilst changing physical location and crossing organizational boundaries has resulted in a wave of new supporting technologies, and generated interest in tackling some of the difficult research issues arsing in such a context. The latter was the subject of the Third IEEE International Workshop on Distributed and Mobile Collaboration (DMC) at WETICE 2005, summirized here. The DMC Workshop included 10 full papers on topics grouped into four areas: Web-based collaboration, Formal description and consistency checking of collaborative processes, Models and architectures for collaborative services, and P2P collaborative infrastructures. The discussions at the workshop outlined several important issues regarding the field of distributed collaborative applications.

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Color textural features under varying illumination

Color textural features under varying illumination

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2004 International Conference on Image Processing, ICIP 2004

作者： Karkanis, S.A. Iakovidis, D.K. Maroulis, D.E. Dept. of Informatics and Computer Technology Technological Educational Institute of Lamia 3rd Kilometer Old National Road 35100 Lamia Greece Real-Time Systems and Image Analysis Group Dept. of Informatics and Telecommunication University of Athens Illisia 15784 Athens Greece

ISBN: (纸本)0780385543

In this paper we present a new feature extraction methodology for color texture recognition. It is based on the covariance of 2nd-order statistical features in the wavelet domain of the color channels of the images and it is named as Color Wavelet Covariance (CWC). The experimentation showed that the CWC features could be used effectively for texture representation even when illumination varies. The use of the linear K-L (Karhunen-Loeve) transformation of the RGB color space for the extraction of the CWC features resulted in a performance that was comparable to the one achieved with more complex non-linear color transformations. The recognition accuracy tested with texture mosaics reached an average of 86%. Using images acquired under varying illumination the performance of the CWC features on the K-L space reached an average of 88%. © 2004 IEEE.

关键词： Feature extraction

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Color textural features under varying illumination

Color textural features under varying illumination

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IEEE International Conference on Image Processing

作者： S.A. Karkanis D.K. Lakovidis D.E. Maroulis Department of Informatics and Computer Technology Technological Educational Institute of Lamia Lamia Greece Real-Time Systems & Image Analysis Group Department of Informatics and Telecommunication University of Athens (NKUA) Athens Greece

In this paper, we present a new feature extraction methodology for color texture recognition. It is based on the covariance of 2/sup nd/-order statistical features in the wavelet domain of the color channels of the images and it is named as color wavelet covariance (CWC). The experimentation showed that the CWC features could be used effectively for texture representation even when illumination varies. The use of the linear K-L (Karhunen-Loeve) transformation of the RGB color space for the extraction of the CWC features resulted in a performance that was comparable to the one achieved with more complex non-linear color transformations. The recognition accuracy tested with texture mosaics reached an average of 86%. Using images acquired under varying illumination the performance of the CWC features on the K-L space reached an average of 88%.

关键词： Lighting Image color analysis Image texture analysis Wavelet transforms Feature extraction Image recognition Wavelet domain informatics Educational technology Robustness

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Application service provision through the grid: business models and architectures

Application service provision through the grid: business mod...

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International Conference on Information Technology: Coding and Computing (ITCC)

作者： B. Vassiliadis K. Giotopoulos K. Votis S. Sioutas N. Bogonikolos S. Likothanassis Digital Systems & Media Computing Laboratory Hellenic Open University Patras Greece Computer Technology Institute & Department of Computer Engineering and Informatics University of Patras Greece ZEUS Consulting LogicDIS Group

The new economy is the result of the information revolution that promotes the emergence of networked, ubiquitous and collaborative service provision. Furthermore, the globalisation of trade has increased the number of competitors, driving the need for federated and networked business models. In this paper we argue that next generation ASP models could benefit from the use of the grid. We describe a grid-enabled architecture for coordinated resource sharing and problem solving in dynamic, multi-institutional ASP vendors.

关键词： Application specific processors Business Application software Globalization computer networks Pervasive computing Virtual private networks computer architecture Collaboration Packaging

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From design to test with UML applied to a roaming algorithm for bluetooth devices

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16th IFIP TC6/WG6.1 International Conference on Testing of Communicating systems, TestCom 2004

作者： Dai, Zhen Ru Grabowski, Jens Neukirchen, Helmut Pals, Holger Fraunhofer FOKUS Competence Center TIP Kaiserin-Augusta-Allee 31 BerlinD-10589 Germany Institute of Computer Engineering University of Lübeck Ratzeburger Allee 160 LübeckD-23538 Germany Institute for Informatics Software Engineering for Distributed Systems Group University of Göttingen Lotzestrasse 16-18 GöttingenD-37083 Germany

ISBN: (纸本)3540212191

The UML Testing Profile provides support for UML based model-driven testing. This paper introduces a methodology of how to use the testing profile in order to modify and extend an existing UML design model for test issues. As a case study, a new roaming algorithm for bluetooth devices has been developed at the University of Lübeck, is modelled using UML. The usability of the UML Testing Profile will be explained by applying it to this model. © IFIP 2004.

关键词： Bluetooth

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Performance of new broadcast forwarding criteria in MANET

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International Conference on Information Networking, ICOIN 2004

作者： Zhu, Lijuan Lee, Bu-Sung Seet, Boon-Chong Wong, Kai-Juan Liu, Genping Huang, Shell-Ying Lee, Keok-Kee Centre for Multimedia and Network Technology School of Computer Engineering Singapore Network Technology Research Centre Research TechnoPlaza Nanyang Technological University 4th Storey Nanyang Avenue 639798 Singapore Institute for Computing Systems Architecture Informatics University of Edinburgh JCMB Mayfield Road EdinburghEH9 3JZ United Kingdom

ISBN: (纸本)3540230343

In a mobile ad hoc network (MANET), packet broadcast is common and frequently used to disseminate information. Broadcast consume large amount of bandwidth resource, which is scarce in MANET environment. The problem is to find the ideal forward node set so as to minimize the bandwidth consumed, which is a NP-Complete problem. In this paper we will investigate three dominant node approximation algorithms: dominant pruning, total dominant pruning and partial dominant pruning algorithm. An extension to the original algorithms, modified termination criteria, is proposed. Simulation results show that the new termination criteria ensure the same coverage using a reduced number of forward nodes. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Approximation algorithms

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A routing strategy for metropolis vehicular communications

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International Conference on Information Networking, ICOIN 2004

作者： Liu, Genping Lee, Bu-Sung Seet, Boon-Chong Foh, Chuan-Heng Wong, Kai-Juan Lee, Keok-Kee Centre for Multimedia and Network Technology School of Computer Engineering Singapore Network Technology Research Centre Research TechnoPlaza Nanyang Technological University 4th Storey Nanyang Avenue 639798 Singapore Institute for Computing Systems Architecture Informatics University of Edinburgh JCMB Mayfield Road EdinburghEH9 3JZ United Kingdom

ISBN: (纸本)3540230343

One of the major issues that affect the performance of mobile ad hoc networks (MANET) is routing. Recently, position-based routing for MANET is found to be a very promising routing strategy for inter-vehicular communication systems (IVCS). However, position-based routing for IVCS in a built-up city environment faces greater challenges because of potentially more uneven distribution of vehicular nodes, constrained mobility, and difficult signal reception due to radio obstacles such as high-rise buildings. This paper proposes a new position-based routing scheme called Anchor-based Street and Traffic Aware Routing (A-STAR), designed specifically for IVCS in a city environment. Unique to A-STAR is the usage of information on city bus routes to identify an anchor path with high connectivity for packet delivery. Along with a new recovery strategy for packets routed to a local maximum, the proposed protocol shows significant performance improvement in a comparative simulation study with other similar routing approaches. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Stars

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