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Scheduling Data Flow Program in XKaapi: A New Affinity Based Algorithm for Heterogeneous Architectures 1

20th European Conference on Parallel Computing (Euro-Par)

作者： Bleuse, Raphael Gautier, Thierry Lima, Joao V. F. Mounie, Gregory Trystram, Denis Univ Grenoble Alpes Grenoble France Inria Rhone Alpes Rennes France Inst Univ France Lyon France Univ Fed Santa Maria Santa Maria RS Brazil

ISBN: (数字)9783319098739

ISBN: (纸本)9783319098739;9783319098722

Efficient implementations of parallel applications on heterogeneous hybrid architectures require a careful balance between computations and communications with accelerator devices. Even if most of the communication time can be overlapped by computations, it is essential to reduce the total volume of communicated data. The literature therefore abounds with ad hoc methods to reach that balance, but these are architecture and application dependent. We propose here a generic mechanism to automatically optimize the scheduling between CPUs and GPUs, and compare two strategies within this mechanism: the classical Heterogeneous Earliest Finish Time (HEFT) algorithm and our new, parametrized, Distributed Affinity Dual Approximation algorithm (DADA), which consists in grouping the tasks by affinity before running a fast dual approximation. We ran experiments on a heterogeneous parallel machine with twelve CPU cores and eight NVIDIA Fermi GPUs. Three standard dense linear algebra kernels from the PLASMA library have been ported on top of the XKaapi runtime system. We report their performances. It results that HEFT and DADA perform well for various experimental conditions, but that DADA performs better for larger systems and number of GPUs, and, in most cases, generates much lower data transfers than HEFT to achieve the same performance.

关键词： Heterogeneous architectures scheduling cost models dual approximation scheme programming tools affinity

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programming with Ghosts

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IEEE SOFTWARE 2013年第1期30卷 74-80页

作者： Callau, Oscar Tanter, Eric Univ Chile Pleiad Res Lab Dept Comp Sci Santiago Chile

Best practices in programming typically imply incremental coding with classes and interfaces that are either not yet defined or only partially defined. Yet integrated development environments (IDEs) don't support incremental coding well, and recent enhancements and third-party plug-ins fail to provide a seamless experience. We propose to reify undefined entities as ghosts, properly supported by the IDE. A Ghost View provides an integrated, modular view of each ghost, reflecting the current set of assumptions about a given undefined entity. This view is built unobtrusively and on the fly, without interrupting the programming workflow, and it supports program understanding tasks such as navigating from ghosts to the places where they're used. Ghosts and their usages are type-checked automatically as soon as they're defined. Busting a ghost generates a complete skeleton, in the background. Ghosts are a simple and useful metaphor to better support incremental development. [ABSTRACT FROM PUBLISHER]

关键词： Context awareness ghosts IDEs integrated development environments Java programming programming environments programming tools Search engines Software development User interfaces Visualization

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Clock synchronization in high-end computing environments: a strategy for minimizing clock variance at runtime

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CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2013年第6期25卷 881-897页

作者： Jones, Terry Koenig, Gregory A. Oak Ridge Natl Lab Comp Sci & Math Div Oak Ridge TN 37831 USA

We present a new software-based clock synchronization scheme that provides high precision time agreement among distributed memory nodes. The technique is designed to minimize variance from a reference chimer during runtime and with minimal time-request latency. Our scheme permits initial unbounded variations in time and corrects both slow and fast chimers (clock skew). An implementation developed within the context of the message passing interface is described, and time coordination measurements are presented. Among our results, the mean time variance for a set of nodes improved from 20.0 ms under standard Network Time Protocol down to 2.29 s under our scheme. Copyright (c) 2012 John Wiley & Sons, Ltd.

关键词： time service clock synchronization MPI supercomputing system software programming tools

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RoboComp: A Tool-Based Robotics Framework

RoboComp: A Tool-Based Robotics Framework

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2nd International Conference on Simulation, Modeling, and programming for Autonomous Robots (SIMPAR)

作者： Manso, Luis Bachiller, Pilar Bustos, Pablo Nunez, Pedro Cintas, Ramon Calderita, Luis Univ Extremadura Robot & Artificial Vis Lab E-06071 Badajoz Spain

ISBN: (纸本)9783642173189

This paper presents RoboComp, an open-source component-oriented robotics framework. Ease of use and low development effort has proven to be two of the key issues to take into account when building frameworks. Due to the crucial role of development tools in these questions, this paper deeply describes the tools that make RoboComp more than just a middleware. To provide an overview of the developer experience, some examples are given throughout the text. It is also compared to the most open-source relevant projects with similar goals, specifying its weaknesses and strengths.

关键词： robotics framework software usability programming tools

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Using information fragments to answer the questions developers ask 10

Using information fragments to answer the questions develope...

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32nd ACM/IEEE International Conference on Software Engineering, ICSE 2010

作者： Fritz, Thomas Murphy, Gail C. Department of Computer Science University of British Columbia Vancouver BC Canada

ISBN: (纸本)9781605587196

Each day, a software developer needs to answer a variety of questions that require the integration of different kinds of project information. Currently, answering these questions, such as "What have my co-workers been doing?", is tedious, and sometimes impossible, because the only support available requires the developer to manually link and traverse the information step-by-step. Through interviews with eleven professional developers, we identified 78 questions developers want to ask, but for which support is lacking. We introduce an information fragment model (and prototype tool) that automates the composition of different kinds of information and that allows developers to easily choose how to display the composed information. In a study, 18 professional developers used the prototype tool to answer eight of the 78 questions. All developers were able to easily use the prototype to successfully answer 94% of questions in a mean time of 2.3 minutes per question. © 2010 ACM.

关键词： programming tools human-centric software engineering information fragments

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Registration-Based Language Abstractions 10

Registration-Based Language Abstractions

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Conference on Object Oriented programming Systems, Languages and Applications/SPLASH 2010

作者： Davis, Samuel Kiczales, Gregor Univ British Columbia Dept Comp Sci Vancouver BC V6T 1W5 Canada

ISBN: (纸本)9781450302036

programming language innovation has been hindered by the difficulty of making changes to existing languages. A key source of difficulty is the tyrannical nature of existing approaches to realizing languages-adding a new language construct means that any tool, document or programmer that works with the language must be prepared to deal with that construct. A registration-based approach makes it possible to define language constructs that are not tyrannical. They are instead transient-the program appears to be written using the constructs only so long as a given programmer wants to see it that way. This approach may have the potential to greatly facilitate programming language innovation.

关键词： Languages Experimentation Registration Fluid AOP programming tools

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Seam framework: experience the evolution of Java EE 2

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丛书名： JBoss Series

2009年

作者： Michael Juntao Yuan Jacob Orshalick Thomas Heute

ISBN: (纸本)9780137129393

Fully Updated to Cover Major Enhancements to Seam 2.x In Seam Framework, Second Edition, the authors of the leading guide to Seam programming have systematically updated their text to reflect the major improvements introduced with Seam 2.x. This author teamall key Seam project contributorsteach Seam 2.x through detailed example applications that reveal how Seam simplifies many tasks that were previously difficult or impractical. Their robust descriptions are complemented by in-depth feature discussions that demonstrate how to use Seams power to the fullest. Whether youre new to Seam programming or a seasoned Seam developer who wants to achieve deeper mastery of Seam 2.x, this book will be an indispensable resource. Coverage includes Using improvements to Seams conversation model, transaction management, and other features Enhancing security, performing end-to-end validation, and providing custom exception pages Using Quartz to execute timer jobs in your application Generating bookmarkable RESTful Web pages the easy way Developing highly scalable applications with Seam *** new multilayer caching Simplifying development with Groovy, the scripting language that runs directly on the JVM Using jBPM business processes to improve page flow Previewing Web Beans (JSR-299), the future core of Seam that will transform Java EE Web development *Download source code for this books case study application at ***/seam.

关键词： Enterprise Application Development Integration programming tools Web Application Development Java Web programming Web Servers General Miscellaneous Networking Telecommunications

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Method of Coupled Interactions for Real-Time Management of Resource Allocation

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OPTOELECTRONICS INSTRUMENTATION AND DATA PROCESSING 2009年第2期45卷 154-160页

作者： Vittikh, V. A. Skobelev, P. O. Russian Acad Sci Inst Control Complex Syst Ul Sadovaya 61 Samara 443020 Russia

A method of coupled interactions for real-time management of resource allocation is proposed. A distinctive feature of the method is the replacement of the enumeration of decision patterns, requiring high computational efforts, by bilateral negotiations aimed at detecting conflicts and reaching compromises between incoming requests and available means in constructing complex schedules. This feature provides significant advantages during solution of complex problems of real-time resource allocation, which can be important for corporate and government management systems.

关键词： coupled interactions networks of needs and means resource allocation real-time scale programming tools

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The conourrency challenge

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IEEE DESIGN & TEST OF COMPUTERS 2008年第4期25卷 312-320页

作者： Hwu, Wen-mei Mattson, Timothy G. Keutzer, Kuirt Univ Illinois Coordinated Sci Lab Urbana IL 61801 USA Intel Corp Applicat Res Lab Santa Clara CA 95051 USA Univ Calif Berkeley Berkeley CA 94720 USA

The evolutionary path of microprocessor design includes both multicore and many-core architectures. Harnessing the most computing throughput from these architectures requires concurrent or parallel execution of instructions. The authors describe the challenges facing the industry as parallel-computing platforms become even more widely available.

关键词： Concurrency Parallel programming Application Frameworks programming Models programming tools Multicore Many Core Software Engineering Autotuning

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Asking and answering questions during a programming change task

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IEEE TRANSACTIONS ON SOFTWARE ENGINEERING 2008年第4期34卷 434-451页

作者： Sillito, Jonathan Murphy, Gail C. De Volder, Kris Univ Calgary Dept Comp Sci Calgary AB T2N 1N4 Canada Univ British Columbia Dept Comp Sci Vancouver BC V6T 1Z4 Canada

Little is known about the specific kinds of questions programmers ask when evolving a code base and how well existing tools support those questions. To better support the activity of programming, answers are needed to three broad research questions: 1) What does a programmer need to know about a code base when evolving a software system? 2) How does a programmer go about finding that information? 3) How well do existing tools support programmers in answering those questions? We undertook two qualitative studies of programmers performing change tasks to provide answers to these questions. In this paper, we report on an analysis of the data from these two user studies. This paper makes three key contributions. The first contribution is a catalog of 44 types of questions programmers ask during software evolution tasks. The second contribution is a description of the observed behavior around answering those questions. The third contribution is a description of how existing deployed and proposed tools do, and do not, support answering programmers' questions.

关键词： change tasks software evolution empirical study development environments programming tools program comprehension

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