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Special issue: acm 2002 java grande-iscope conference

CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2005年第5-6期17卷 419-422页

作者： Fox, G Indiana Univ Bloomington IN 47405 USA

This special issue is devoted to selected papers from the acm 2002 javagrande-iscope (JGI2002) conference. It was held in Seattle, WA, 3-5 November 2002. java grande andiscope (International Symposium on Computing in Object-oriented Parallel Environments) continuedtheir partnership with a joint conference, and a merged Call for Papers and Program Committee. Assuch, the JGI2002 conference focused on object-orientation in a broad range of topics (includingparallelism, communication, distribution, and high-performance applications and systems) and java inthe broad area of high-performance computing (including engineering and scientific applications,simulations, and data-intensive applications). This combined conference represented one of theWorld's premier research forums in high-performance object-oriented computation. All of the papershave been revised and re-refereed to ensure appropriate journal quality. This was the seventh of aseries of meetings, exploring the use of the object-oriented techniques and the java programminglanguage for scientific and engineering computing and high-performance network computing—a range ofapplications that has been denoted with the epithet 'grande'. The previous java grande workshopswere held very successfully in Syracuse in 1996, Las Vegas in 1997, Palo Alto in 1998, San Franciscoin 1999 and 2000, and Palo Alto (Stanford University) again in 2001. The proceedings were alsopublished in special issues of Concurrency and Computation: Practice ami Experience (volume 9,issues 6 and 11; volume 10, issues 11-13; volume 12 issues 6-8; volume 13. issues 8-9; and volume 15Issues 3-5).

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Ravenscar-java: a high-integrity profile for real-time java 02

Ravenscar-Java: a high-integrity profile for real-time Java

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International Symposium on Computing in Object Oriented Parallel Environments

作者： Kwon, J Wellings, A King, S Univ York Dept Comp Sci Real Time Syst Res Grp York YO10 5DD N Yorkshire England

ISBN: (纸本)9781581135992

For many, java is the antithesis of a high-integrity programming language. Its combination of object-oriented programming features, its automatic garbage collection, and its poor support for real-time multi-threading are all seen as particular impediments. The Real-Time Specification for java has introduced many new features that help in, the real-time. domain. However, the expressive power of these features means that very complex programming models can be created, necessitating complexity in the supporting real-time virtual machine. Consequently, java, with the real-time extensions as they stand, seems too complex for confident use in high-integrity systems. This paper presents a java profile for-the development of software-intensive high-integrity real-time systems. This restricted programming model removes language features with high overheads and complex semantics, on which it is hard to perform timing and functional analyses. The profile fits within the J2ME framework and is consistent with well-known guidelines for high-integrity software development, such as those defined by the U.S. Nuclear Regulatory Commission. Copyright (c) 2005 John Wiley & Sons, Ltd.

关键词： high-integrity systems real-time java profile

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Adding tuples to java: a study in lightweight data structures 02

Adding tuples to Java: a study in lightweight data structure...

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International Symposium on Computing in Object Oriented Parallel Environment

作者： van Reeuwijk, C Sips, HJ Delft Univ Technol NL-2628 CD Delft Netherlands

ISBN: (纸本)9781581135992

java classes are very flexible, but this comes at a price. The main cost is that every class instance must be dynamically allocated. Also, their access by reference introduces pointer de-references and complicates program analysis. These costs are particularly burdensome for small, ubiquitous data structures such as coordinates and state vectors. For such data structures a lightweight representation is desirable, allowing such data to be handled directly, similar to primitive types. A number of proposals introduce restricted or mutated variants of standard java classes that could serve as lightweight representation, but the impact of these proposals has never been studied. Since we have implemented a java compiler with lightweight data structures we are in a good position to do this evaluation. Our lightweight data structures are tuples. As we will show, using tuples can result in significant performance gains: for a number of existing benchmark programs we gain more than 50% in performance relative to our own compiler, and more than 20% relative to Sun's Hotspot 1.4 compiler. We expect similar performance gains for other implementations of lightweight data structures. With respect to the expressiveness of java, lightweight variants of standard java classes have little impact. In contrast, tuples add a different language construct that, as we will show, can lead to substantially more concise program code. Copyright (c) 2005 John Wiley J Sons, Ltd.

关键词： tuple java lightweight data structures

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Run-time evaluation of opportunities for object inlining in java 02

Run-time evaluation of opportunities for object inlining in ...

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International Symposium on Computing in Object Oriented Parallel Environments

作者： Lhoták, O Hendren, L McGill Univ Sch Comp Sci Sable Res Grp Montreal PQ Canada

ISBN: (纸本)9781581135992

Object-oriented languages, such as java, encourage the use of many small objects linked together by field references, instead of a few monolithic structures. While this practice is beneficial from a program design perspective, it can slow down program execution by incurring many pointer indirections. One solution to this problem is object inlining: when the compiler can safely do so, it fuses small objects together, thus removing the reads/writes to the removed field, saving the memory needed to store the field and object header, and reducing the number of object allocations. The objective of this paper is to measure the potential for object inlining by studying the run-time behaviour of a comprehensive set of java programs. We study the traces of program executions in order to determine which fields behave like inlinable fields. Since we are using dynamic information instead of a static analysis, our results give an upper bound on what could be achieved via a static compiler-based approach. Our experimental results measure the potential improvements attainable with object inlining, including reductions in the numbers of field reads and writes, and reduced memory usage. Our study shows that some java programs can benefit significantly from object inlining, with close to a 10% speedup. Somewhat to our surprise, our study found one case, the db benchmark, where the most important infinable field was the result of unusual program design, and fixing this small flaw led to both better performance and clearer program design. However, the opportunities for object infining are highly dependent on the individual program being considered, and are in many cases very limited. Furthermore, fields that are inlinable also have properties that make them potential candidates for other optimizations such as removing redundant memory accesses. The memory savings possible through object inlining are moderate. Copyright (c) 2005 John Wiley & Sons, Ltd.

关键词： object inlining java compilers optimization

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proceedings of the acm 2001 java grande/iscope conference

Proceedings of the ACM 2001 Java grande/ISCOPE conference

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proceedings of the acm 2001 java grande/iscope conference

ISBN: (纸本)1581133596

The proceedings contains 23 papers from the acm 2001 java grande/iscope conference. Topics discussed include: object-based collective communication in java;supporting dynamic parallel object arrays;core semantics of multithreaded java;a scalable, robust network for parallel computing and integration and application of the TAU performance system in parallel java environments.

关键词： java programming language

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Editorial: acm 2001 java grande–iscope (JGI2001) conference

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Concurrency and Computation: Practice and Experience 2003年第3‐5期15卷

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Automatic translation of Fortran to JVM bytecode 01

Automatic translation of Fortran to JVM bytecode

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acm 2001 java grande/International Symposium on Computing in Object-Oriented Parallel Environments

作者： Seymour, K Dongarra, J Univ Tennessee Dept Comp Sci Knoxville TN 37996 USA

ISBN: (纸本)9781581133592

This paper reports on the design of a Fortran-to-java translator whose target language is the instruction set of the java Virtual Machine. The goal of the translator is to generate java implementations of legacy Fortran numerical codes in a consistent and reliable fashion. The benefits of directly generating bytecode are twofold. First, compared with generating java source code, it provides a much more straightforward and efficient mechanism for translating Fortran GOTO statements. Second, it provides a framework for pursuing various compiler optimizations, which could be beneficial not only to our project, but to the java community as a whole. Copyright (C) 2003 John Wiley Sons, Ltd.

关键词： Fortran java JVM bytecode numerical libraries

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Run-time optimizations for a java DSM implementation 01

Run-time optimizations for a Java DSM implementation

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acm 2001 java grande/International Symposium on Computing in Object-Oriented Parallel Environments

作者： Veldema, R Hofman, RFH Bhoedjang, RAF Bal, HE Vrije Univ Amsterdam Dept Comp Sci Amsterdam Netherlands Cornell Univ Dept Comp Sci Ithaca NY 14853 USA

ISBN: (纸本)9781581133592

Jackal is a fine-grained distributed shared memory implementation of the java programming language. Jackal implements java's memory model and allows multithreaded java programs to run unmodified on distributed-memory systems. This paper focuses on Jackal's run-time system, which implements a multiple-writer, home-based consistency protocol. Protocol actions are triggered by software access checks that Jackal's compiler inserts before object and array references. To reduce access-check overhead, the compiler exploits source-level information and performs extensive static analysis to optimize, lift, and remove access checks. We describe optimizations for Jackal's run-time system, which mainly consists of discovering opportunities to dispense with flushing of cached data. We give performance results for different run-time optimizations, and compare their impact with the impact of one compiler optimization. We find that our run-time optimizations are necessary for good Jackal performance, but only in conjunction with the Jackal compiler optimizations described by Veldema et al. As a yardstick, we compare the performance of java applications run on Jackal with the performance of equivalent applications that use a fast implementation of java's Remote Method Invocation instead of shared memory. Copyright (C) 2003 John Wiley Sons, Ltd.

关键词： java DSM compiler runtime protocols

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High-performance java codes for computational fluid dynamics 01

High-performance Java codes for computational fluid dynamics

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acm 2001 java grande/International Symposium on Computing in Object-Oriented Parallel Environments

作者： Riley, CJ Chatterjee, S Biswas, R Blue Ridge Numer Inc Charlottesville VA 22901 USA IBM Corp Thomas J Watson Res Ctr Yorktown Hts NY 10598 USA NASA Adv Supercomp Div Ames Res Ctr Moffett Field CA 94035 USA

ISBN: (纸本)9781581133592

The computational science community is reluctant to write large-scale computationally-intensive applications in java due to concerns over java's poor performance, despite the claimed software engineering advantages of its object-oriented features. Naive java implementations of numerical algorithms can perform poorly compared to corresponding Fortran or C implementations. To achieve high performance, java applications must be designed with good performance as a primary goal. This paper presents the object-oriented design and implementation of two real-world applications from the field of computational fluid dynamics (CFD): a finite-volume fluid flow solver (LAURA, from NASA Langley Research Center) and an unstructured mesh adaptation algorithm (2D_TAG, from NASA Ames Research Center). This work builds on our previous experience with the design of high-performance numerical libraries in java. We examine the performance of the applications using the currently available java infrastructure and show that the java version of the flow solver LAURA performs almost within a factor of 2 of the original procedural version. Our java version of the mesh adaptation algorithm 2D-TAG performs within a factor of 1.5 of its original procedural version on certain platforms. Our results demonstrate that object-oriented software design principles are not necessarily inimical to high performance. Copyright (C) 2003 John Wiley Sons, Ltd.

关键词： scientific computing object-oriented benchmarks

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CartaBlanca - a pure-java, component-based systems simulation tool for coupled nonlinear physics on unstructured grids - an update 01

CartaBlanca - a pure-Java, component-based systems simulatio...

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acm 2001 java grande/International Symposium on Computing in Object-Oriented Parallel Environments

作者： VanderHeyden, WB Dendy, ED Padial-Collins, NT Los Alamos Natl Lab Div Theoret Los Alamos NM 87545 USA Los Alamos Natl Lab Los Alamos Comp Sci Inst Los Alamos NM 87545 USA

ISBN: (纸本)9781581133592

This paper describes a component-based nonlinear physical system simulation prototyping package written entirely in java using object-oriented design. The package provides scientists and engineers with a 'developer-friendly' software environment for large-scale computational algorithm and physical model development. The software design centers on the Jacobian-free Newton-Krylov solution method surrounding a finite-volume treatment of conservation equations. This enables a clean component-like implementation. We first provide motivation for the development of the software and then discuss software structure. The discussion includes a description of the use of java's built-in thread facility that enables parallel, shared-memory computations on a wide variety of unstructured grids with triangular, quadrilateral, tetrahedral and hexahedral elements. We also discuss the use of java's inheritance mechanism in the construction of a hierarchy of physics systems objects and linear and nonlinear solver objects that simplify development and foster software re-use. We provide a brief review of the Jacobian-free Newton-Krylov nonlinear system solution method and discuss how it fits into our design. Following this, we show results from example calculations and then discuss plans including the extension of the software to distributed-memory computer systems. Copyright (C) 2003 John Wiley Sons, Ltd.

关键词： java high performance computing object oriented design finite volume nonlinear solver development environment

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