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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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Providing soft real-time quality of service guarantees for java threads

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CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2003年第3-5期15卷 521-538页

作者： Pang, JC Shoja, GC Manning, EG Univ Victoria Dept Comp Sci Victoria BC V8W 3P6 Canada Univ Victoria Dept Elect & Comp Engn Victoria BC V8W 3P6 Canada

The java platform has many characteristics that make it very desirable for integrated continuous media processing. Unfortunately, it lacks the necessary CPU resource management facilities to support quality of service (QoS) guarantees for soft real-time multimedia tasks. In this paper, we present our new java Virtual Machine, Q-JVM, which brings CPU resource management to the java platform. Q-JVM is based on Sun's JVM version 1.1.5. It implements an enhanced version of the MTR-LS algorithm in its thread scheduler. Combined with admission control that could be implemented in an application-level resource manager, it is able to support QoS parameters such as fairness, bandwidth partitioning and delay bound guarantees, as well as the cumulative service guarantee. Our test results show that Q-JVM is backward compatible with the standard JVM from Sun, has low scheduling overhead, and is able to provide QoS guarantees as specified. Copyright (C) 2003 John Wiley Sons, Ltd.

关键词： java Virtual Machine CPU resource management QoS real-time scheduling move-to-rear list scheduling

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Spar: a set of extensions to java for scientific computation

Spar: a set of extensions to Java for scientific computation

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acm 2001 java grande/international symposium on computing in object-oriented parallel environments

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

ISBN: (纸本)1581133596

We present a set of language extensions that improve the expressiveness and performance of java for scientific computation. The language extensions allow the manipulation of multi-dimensional arrays to be expressed more naturally, and to be implemented more efficiently. Furthermore, data-parallel programming is supported, allowing efficient parallelization of a large class of operations on arrays. We also provide language extensions to construct specialized array representations, such as symmetric, block, and sparse matrices. These extensions are: tuples, parameterized types, array subscript overloading, and the inline modifier. These extensions are not only useful in the construction of special array representations, but are also useful in their own right. Finally, we add complex numbers as a primitive type to the language. We evaluate our language extensions using performance results. We also compare relevant code fragments of our extended language with standard java implementations and language extensions proposed by others. Copyright (C) 2003 John Wiley Sons, Ltd.

关键词： java multi-dimensional array tuple parameterized type

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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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CCJ: object-base message passing and collective communication in java

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CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2003年第3-5期15卷 341-369页

作者： Nelisse, A Maassen, J Kielmann, T Bal, HE Vrije Univ Amsterdam Div Math & Comp Sci Amsterdam Netherlands

CCJ is a communication library that adds MPI-like message passing and collective operations to java. Rather than trying to adhere to the precise MPI syntax, CCJ aims at a clean integration of communication into java's object-oriented framework. For example, CCJ uses thread groups to support java's multithreading model and it allows any data structure (not just arrays) to be communicated. CCJ is implemented entirely in java, on top of RMI, so it can be used with any java virtual machine. The paper discusses three parallel java applications that use collective communication. It compares the performance (on top of a Myrinet cluster) of CCJ, RMI and mpijava versions of these applications and also compares their code complexity. A detailed performance comparison between CCJ and mpijava is given using the java grande Forum MPJ benchmark suite. The results show that neither CCJ's object-oriented design nor its implementation on top of RMI impose a performance penalty on applications compared to their mpijava counterparts. The source of CCJ is available from our Web site http://***/manta. Copyright (C) 2003 John Wiley Sons, Ltd.

关键词： parallel programming collective communication

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Integration and applicaiton of TAU in parallel java environments

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CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2003年第3-5期15卷 501-519页

作者： Shende, S Malony, AD Univ Oregon Dept Comp & Informat Sci Eugene OR 97403 USA

parallel java environments present challenging problems for performance tools because of java's rich language system and its multi-level execution platform combined with the integration of native-code application libraries and parallel run-time software. In addition to the desire to provide robust performance measurement and analysis capabilities for the java language itself, the coupling of different software execution contexts under a uniform performance model needs careful consideration of how events of interest are observed and how cross-context parallel execution information is linked. This paper relates our experience in extending the TAU (Timing and Analysis Utilities) performance system to a parallel java environment based on mpijava. We describe the complexities of the instrumentation model used, how performance measurements are made, and the overhead incurred. A parallel java application simulating the game of Life is used to show the performance system's capabilities. Copyright (C) 2003 John Wiley Sons, Ltd.

关键词： parallel java performance tools

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Platform independent dynamic java virtual machine analysis: the java grande Forum benchmark suite

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CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2003年第3-5期15卷 459-484页

作者： Gregg, D Power, J Waldron, J Univ Dublin Trinity Coll Dept Comp Sci Dublin 2 Ireland Natl Univ Ireland Dept Comp Sci Maynooth Kildare Ireland

In this paper we present a platform independent analysis of the dynamic profiles of java programs when executing on the java Virtual Machine. The java programs selected are taken from the java grande Forum benchmark suite and five different java-to-bytecode compilers are analysed. The results presented describe the dynamic instruction usage frequencies. as well as the sizes of the local variable, parameter and operand stacks during execution on the JVM. These results, presenting a picture of the actual (rather than presumed) behaviour of the JVM, have implications both for the coverage aspects of the java grande benchmark suites, for the performance of the java-to-bytecode compilers and for the design of the JVM. Copyright (C) 2003 John Wiley Sons, Ltd.

关键词： java Virtual Machine java grande instruction frequency method profiling

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Benchmarking java against C and Fortran for scientific applications

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CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2003年第3-5期15卷 417-430页

作者： Bull, JM Smith, LA Ball, C Pottage, L Freeman, R Univ Edinburgh Edinburgh Parallel Comp Ctr Edinburgh EH9 3JZ Midlothian Scotland

Increasing interest is being shown in the use of java for scientific applications. The java grande benchmark suite was designed with such applications primarily in mind. The perceived lack of performance of java still deters many potential users, despite recent advances in just-in-time and adaptive compilers. There are, however, few benchmark results available comparing java to more traditional languages such as C and Fortran. To address this issue, a subset of the java grande benchmarks has been re-written in C and Fortran allowing direct performance comparisons between the three languages. The performance of a range of java execution environments, C and Fortran compilers have been tested across a number of platforms using the suite. These demonstrate that on some platforms (notable Intel Pentium) the performance gap is now quite small. Copyright (C) 2003 John Wiley Sons, Ltd.

关键词： java C Fortran performance benchmarking scientific applications

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Automatic translation of Fortran to JVM bytecode

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CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2003年第3-5期15卷 207-222页

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

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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java Virtual Machine support for object serialization

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CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2003年第3-5期15卷 263-275页

作者： Breg, F Polychronopoulos, CD Univ Illinois Coordinated Sci Lab Urbana IL 61801 USA

Distributed computing has become increasingly popular in the high-performance community. java's remote method invocation (RMI) provides a simple, yet powerful method for implementing parallel algorithms. The performance of RMI has been less than adequate, however, and object serialization is often identified as a major performance inhibitor. We believe that object serialization is best performed in the java Virtual Machine (JVM), where information regarding object layout and hardware communication resources are readily available. We implement a subset of java's object serialization protocol in native code, using the java Native Interface (JNI) and JVM internals. Experiments show that our approach is up to eight times faster than java's original object serialization protocol for array objects. Also, for linked data structures our approach obtains a moderate speedup and better scalability. Evaluation of our object serialization implementation in an RMI framework indicates that a higher throughput can be obtained. parallel applications, written using RMI, obtain better speedups and scalability when this more efficient object serialization is used. Copyright (C) 2003 John Wiley Sons, Ltd.

关键词： java object serialization

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