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Some essential techniques for developing efficient petascale applications

Journal of Physics: Conference Series 2008年第1期125卷

作者： Kalé, L.V. Parallel Programming Laboratory Computer Science Department University of Illinois at Urbana-Champaign Urbana IL 61810 United States

Multiple petaflops-lass machines will appear during the coming year, and many multipetaflops machines are on the anvil. It will be a substantial challenge to make existing parallel CSE applications run efficiently on them, and even more challenging to design new applications that can effectively leverage the large computational power of these machines. Multicore chips and SMP nodes are becoming popular and pose challenges of their own. Further, a new set of challenges in productivity arise, especially if we wish to have a broader set of applications and people to use these machines. Reviewed here is a set of techniques that have proved useful in multiple parallel applications that have scaled to tens of thousands of processors, on machines such as the Blue Gene/L, Blue Gene/P, Cray XT3, and XT4. New challenges and potential solutions for the performance issues are identified. Issues presented by multicore chips and SMP nodes also rre addressed. Also reviewed are some new and old ideas for increasing productivity in parallel programming substantially. © 2008 IOP Publishing Ltd.

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Redundant optical data transmission using semiconductor lasers

Redundant optical data transmission using semiconductor lase...

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ACS/IEEE International Conference on computer Systems and Applications

作者： H. D. Wacker J. Borcsok H. Hillmer Development HIMA Paul Hildebrandt GmbH + Co KG Bruehl GERMANY Department of Electrical Engineering and Computer Science Chair for Computer Architecture and System Programming Kassel GERMANY University of Kassel Institute of Nanostructure Technologies and Analytics (INA) and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT) Kassel GERMANY

This paper is dealing with redundant optoelectronic data transmission with special respect to laser channels. The concept of the generalized erasure channel (GEC) is used to determine the probability of undetected error for some binary symmetric and non-symmetric channels protected by appropriate codes. In detail, communication via different binary symmetric channels (BSCs), generalized erasure channels and symmetrized binary non symmetric channels (BNSCs) is investigated. Simple upper bounds are given, relating the new formulas to that one of the BSC Finally the results in connection with an inequality for proper codes are applied to multi wavelength optical transmission through channels generated by semiconductor lasers.

关键词： Data communication Semiconductor lasers Error probability Optical transmitters Protection Safety Wavelength division multiplexing Laser theory Upper bound Linear code

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Control of Autonomous Solid Oxide Fuel Cells Subject to Sudden Load Variations

Control of Autonomous Solid Oxide Fuel Cells Subject to Sudd...

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2008 IEEE/PES Transmission & Distribution Conference & Exposition, part 1

作者： Dong-Jing Lee Li Wang Department of Electrical Engineering and Computer Science Chair for Computer Architecture and System Programming National Cheng Kung University Tainan Taiwan

This paper presents dynamic behaviors of autonomous solid oxide fuel cells (SOFC) with AC bus control. Both voltage and frequency control are utilized to achieve load-sharing of the studied SOFC feeding isolated loads. A DC-to-DC converter is connected to the output terminals of the studied SOFC for stabilizing output voltage and current fluctuations under different loading conditions. The PWM inverter connected to the output terminals of the DC-to-DC converter is operated under voltage-controlled mode to regulate the voltage profile across the connected loads. It can be concluded from the simulation results that the proposed voltage and frequency droop controllers of the PWM inverter may operate satisfactory under stand-alone mode.

关键词： Solid oxide fuel cells (SOFC) DC-to-DC converter PWM inverter Stand-alone mode

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A modeling framework for the development of provably secure E-commerce applications

A modeling framework for the development of provably secure ...

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2nd International Conference on Software Engineering Advances - ICSEA 2007

作者： Moebius, Nina Haneberg, Dominik Reif, Wolfgang Schellhorn, Gerhard Institute of Computer Science University Augsburg Department of Software Engineering and Programming Languages 86135 Augsburg Germany

ISBN: (纸本)0769529372

Developing security-critical applications is very difficult and the past has shown that many applications turned out to be erroneous after years of usage. For this reason it is desirable to have a sound methodology for developing security-critical E-Commerce applications. We present an approach to model these applications with the unified modeling language (UML) [1] extended by a UML profile to tailor our models to security applications. Our intent is to (semi-) automatically generate a formal specification suitable for verification as well as an implementation from the model. Therefore we offer a development method seamlessly integrating semi-formal and formal methods as well as the implementation. This is a significant advantage compared to other approaches not dealing with all aspects from abstract models down to code. Based on this approach we can prove security properties on the abstract protocol level as well as the correctness of the protocol implementation in Java with respect to the formal model using the refinement approach. In this paper we concentrate on the modeling with UML and some details regarding the transformation of this model into the formal specification. We illustrate our approach on an electronic payment system called Mondex [10]. Mondex has become famous for being the target of the first ITSEC evaluation of the highest level E6 which requires formal specification and verification. © 2007 IEEE.

关键词： Unified Modeling Language

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On optimising shape-generic array programs using symbolic structural information

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18th International Symposium on Implementation and Application of Functional Languages, IFL 2006

作者： Trojahner, Kai Grelck, Clemens Scholz, Sven-Bodo University of Lübeck Institute of Software Technology and Programming Languages University of Hertfordshire Department of Computer Science

ISBN: (纸本)9783540741299

Shape-generic programming and high run time performance do match if generic source code is systematically specialised into nongeneric executable code. However, as soon as we drop the assumption of whole-world knowledge or refrain from specialisation for other reasons, compiled generic code is substantially less efficient. Limited effectiveness of code optimisation techniques due to the inherent lack of knowledge about the structural properties of arrays can be identified as the single most important source of inefficiency. However, in many cases partial structural information or structural relationships between arrays would actually suffice for optimisation. We propose symbolic array attributes as a uniform scheme to infer and to represent partial and relational structural information in shape-generic array code. By reusing the regular language to express structural properties in intermediate code, existing optimisations benefit from symbolic array attributes with little or no alteration. In fact, program optimisation and identification of structural properties cross-fertilise each other. We outline our approach in the context of the functional array language SAC and demonstrate its effectiveness by a small case study. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Information analysis

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Many-valued logic, normal forms

Many-valued logic, normal forms

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10th Symposium on programming Languages and Software Tools, SPLST 2007

作者： Varga, Katalin Pásztor Várterész, Magda Department of Programming Languages and Compilers Eötvös Loránd University Hungary Department of Computer Science University of Debrecen Hungary

ISBN: (纸本)9789634639251

Interpretation of the truth degrees. Suitable extension of the two-valued logical operations as conjunction, disjunction, implication, negation. Main directions (Post, Kleene, Lukasiewicz, Bochvar). Notion of assertability. Designated values. Functional completeness via two valued negation, conjunction, disjunction. Normal forms as tools in theorem proving.

关键词： Many valued logics

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The JastAdd extensible java compiler

The JastAdd extensible java compiler

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22nd Annual ACM SIGPLAN International Conference on Object-Oriented programming, Systems, Languages, and Applications, OOPSLA'07

作者： Ekman, Torbjörn Görel, Hedin Programming Tools Group University of Oxford United Kingdom Department of Computer Science Lund University Sweden

ISBN: (纸本)1595937862

The JastAdd Extensible Java Compiler is a high quality Java that is easy to extend in order to build static analysis for Java, and to extend Java with new language constructs. built modularly, with a Java 1.4 compiler that is to a Java 5 compiler. Example applications that are as extensions include an alternative backend that generates, an extension of Java with AspectJ constructs, the implementation of a pluggable type system for nonnull and inference. system is implemented using JastAdd, a declarative like language. We describe the compiler architecture, major design ideas for building and extending the compiler, particular, for dealing with complex extensions that name and type analysis. Our extensible compiler compares favorably concerning quality, speed and size with extensible Java compiler frameworks. It also compares in quality and size compared with traditional nonextensible compilers, and it runs within a factor of three compared to javac. © 2007 ACM.

关键词： Java programming language

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Integrated UML and Modelica System Modeling with ModelicaML in Eclipse 11

Integrated UML and Modelica System Modeling with ModelicaML ...

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11th IASTED International Conference on Software Engineering and Applications, SEA 2007

作者： Pop, Adrian Akhvlediani, David Fritzson, Peter Programming Environments Laboratory Department of Computer and Information Science Linköping University LinköpingSE-581 83 Sweden

ISBN: (纸本)9780889867055

Complex products are increasingly consisting of both software and hardware components which are closely interacting. Thus, modeling tools and processes need to support co-design of software and hardware in an integrated way. Currently, UML is the dominant graphical modeling notation for software, whereas Modelica is the major object-oriented mathematical modeling language for component-oriented modeling of complex physical systems, e.g., systems containing mechanical, electrical, electronic, hydraulic, thermal, control, electric power or process-oriented subcomponents. Here we present the first comprehensive UML-Modelica-SysML integrated modeling environment as a ModelicaML profile integrated in Eclipse. The profile reuses artifacts from the System Modeling Language (SysML) profile, and combines the major UML diagrams with Modelica graphic connection diagrams. Requirement, equation, and simulation diagrams are also supported in an integrated way. Moreover, the availability of the UML-style internal class diagram view for Modelica classes may also ease the understanding of modeling with Modelica for software developers with a UML background.

关键词： Object oriented programming

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Towards unified system modeling with the ModelicaML UML profile

Towards unified system modeling with the ModelicaML UML prof...

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1st International Workshop on Equation-Based Object-Oriented Languages and Tools, EOOLT 2007 - In Conjunction with the ECOOP 2007 Conference

作者： Pop, Adrian Akhvlediani, David Fritzson, Peter Programming Environments Lab Department of Computer and Information Science Linköping University SE-581 83 Linköping Sweden

In order to support the development of complex products, modeling tools and processes need to support co-design of software and hardware in an integrated way. Modelica is the major object-oriented mathematical modeling language for component-oriented modeling of complex physical systems and UML is the dominant graphical modeling notation for software. In this paper we propose ModelicaML UML profile as an integration of Modelica and UML. The profile combines the major UML diagrams with Modelica graphic connection diagrams and is based on the System Modeling Language (SysML) profile.

关键词： Unified Modeling Language

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Attracting and retaining women in computer science and engineering: Evaluating the results

Attracting and retaining women in computer science and engin...

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114th Annual ASEE Conference and Exposition, 2007

作者： Keathly, David Akl, Robert Garlick, Ryan University of North Texas United States IEEE Computer Society ACM and the UNT Programming Teams IEEE University of North Texas Department of Computer Science and Engineering United States

computer science and engineering communities have been exploring a variety of activities and techniques to attract and retain more students, especially women and minorities, to computer science and computer engineering degree programs1. This paper briefly describes the efforts and results of a plan for actively recruiting young women into undergraduate computer engineering and computer science programs hosted by the University of North Texas (UNT). It also describes a series of activities aimed at improving the retention rate of students already in our programs, particularly during the freshman year. Such recruitment and retention efforts are critical to the country's efforts to increase the number of engineering professionals, and are a priority for the computer science and Engineering (CSE) department at UNT. We initially designed a three-part plan to achieve our recruitment and retention goals: Sponsorship of portable and mobile summer computer engineering robotics camps for middle and high-school women students, coordinating with the regional Girl Scouts councils and other organizations to help with the recruitment;Creation of an Ambassador program using young women currently enrolled in the upper division of current computer science and computer engineering programs as a form of outreach to area high schools and junior colleges;and Expansion of our successful undergraduate mentoring program by using the Ambassador cohort mentioned above as mentors for incoming freshman and first-year transfer women entering our programs. This paper will focus primarily on the summer camp program and present an analysis of the results we have seen to date after 2 years of camp activities. Results from student surveys and parent surveys will be presented. The paper concludes with recommended changes and improvements in the program, as well as a discussion of adaptations that would create programs suitable for implementation at other institutions as well as programs aimed at a dif

关键词： computer science

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