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检索条件"任意字段=1st Java Virtual Machine Research and Technology Symposium, JVM 2001"

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Dynamic type checking in Jalapeño 1

Dynamic type checking in Jalapeño

引用

1st java virtual machine research and technology symposium, jvm 2001

作者： Alpern, Bowen Cocchi, Anthony Grove, David IBM T. J. Watson Research Center Yorktown HeightsNY10598 United States

ISBN: (纸本)1880446111

A java virtual machine (jvm) must sometimes check whether a value of one type can be can be treated as a value of another type. The overhead for such dynamic type checking can be a significant factor in the running time of some java programs. This paper presents a variety of techniques for performing these checks, each tailored to a particular restricted case that commonly arises in java programs. By exploiting compile-time information to select the most applicable technique to implement each dynamic type check, the run-time overhead of dynamic type checking can be significantly reduced. This paper suggests maintaining three data structures operationally close to every java object. The most important of these is a display of identifiers for the superclasses of the object's class. With this array, most dynamic type checks can be performed in four instructions. It also suggests that an equality test of the run-time type of an array and the declared type of the variable that contains it can be an important short-circuit check for object array stores. Together these techniques result in significant performance improvements on some benchmarks. © 2001 The USENIX Association.

关键词： java programming language

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Mostly accurate stack scanning 1

Mostly accurate stack scanning

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1st java virtual machine research and technology symposium, jvm 2001

作者： Barabash, Katherine Kolodner, Elliot K. Shepherd, Janice Buchbinder, Niv Ossia, Yoav Sivan, Ron Domani, Tamar Pinter, Shlomit S. Umansky, Victor IBM Haifa Research Laboratory Israel

ISBN: (纸本)1880446111

The java virtual machine (jvm) needs, for the purpose of garbage collection (GC), to determine the data type stored in every memory location. jvms that can do this reliably are said to be type-accurate (TA). Full typeaccuracy usually exacts a price in performance due to the need to scan stacks and registers accurately. The mostly accurate approach presented here can reduce the TA overhead significantly by sacrificing accuracy for the small minority of memory locations that add the most to the cost. Performance results show that mostly accurate stack scanning performs as well as conservative stack scanning and that relatively few objects are identified conservatively. In addition our implementation is designed to support and generate type maps for any verifiable bytecode stream (including combinations that are unlikely to be produced by a compiler) without requiring rewriting of the bytecode. We introduce a new compression technique for type maps that uses a program-friendly format for the maps;yet, achieves good compression and provides fast opening of compressed maps. We show how to apply systematic testing techniques and test coverage tools to an accurate stack scanner. © 2001 The USENIX Association.

关键词： Scanning

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Distributed and parallel execution of java programs on a DSM system

Distributed and parallel execution of Java programs on a DSM...

引用

1st IEEE/ACM International symposium on Cluster Computing and the Grid, CCGrid 2001

作者： Hou, Ting-Wei Chen, Fuh-Gwo Lee, J.L. Cheng, Y.L. Network Computing Laboratory Department of Engineering Science National Cheng Kung University Tainan Taiwan

ISBN: (纸本)0769510108

The paper focuses on the loop-level parallelism of bytecode on a distributed shared memory (DSM) system, which is built on a cluster of multiprocessors. We define a new attribute called 'Loop Attribute' to record the information of java loops. When first loading a java program, our java virtual machine, called ES-jvm, checks and analyzes the loops of the bytecode dynamically, handles the data dependence of loops, and records the information as the loop attributes. ES-jvm uses the virtual shared memory and synchronization mechanisms provided by the DSM system to maintain the memory consistency. Before ES-jvm interprets the loops of the bytecodes, it dispatches the workload of loops to the interpreter threads at all nodes according to the loop attributes and the number of threads. After distributed and parallel execution of the loops, ES-jvm continues to interpret the rest of the bytecodes of the java program. Finally, ES-jvm saves the loop attributes in a new class file for the next run. Our research shows that distributed and parallel execution of loops of a java program could improve performance. © 2001 IEEE.

关键词： virtual machine

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OpenJIT 2: The design and implementation of application framework for JIT compilers 1

OpenJIT 2: The design and implementation of application fram...

引用

1st java virtual machine research and technology symposium, jvm 2001

作者： Maruyama, Fuyuhiko Matsuoka, Satoshi Ogawa, Hirotaka Maruyama, Naoya Shimura, Kouya Tokyo Institute of Technology Tokyo Japan Fujitsu Laboratories Kanagawa Japan Japan Science and Technology Corporation Japan

ISBN: (纸本)1880446111

We are currently working on a new architecture for java JIT compilers to allow coexistence of multiple, customized JIT compilers in a single java VM simultaneously without prohibitive space or programming costs, called OpenJIT2. The pro ject builds on the success of OpenJIT1, the first open-ended JIT compiler for java written in java. Not only that our new architecture subsumes the so-called 'bi-level' or 'tri-level' JIT compilers of today, but allows application, environment, or user-specific JIT compilers to coexist and invoked at appropriate moments as decided by the runtime. The compiler fragment modules can either be built-in or even dynamically downloaded from the network on demand to tailor the compiler for specific needs. We believe such customization allows the best performance to be squeezed out of applications in a way not possible with generic optimization strategies. OpenJIT2 will also be publically distributed for free and supported just as was with OpenJIT1 to serve as application framework for general compiler research by others, having a very clean and customizable ob ject-oriented frame-work structure as opposed to OpenJIT1. We also hope that it will serve as commercial quality replacement JIT compiler for various platforms. © 2001 The USENIX Association.

关键词： Just in time production

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state capture and resource control for java: The design and implementation of the aroma virtual machine 1

State capture and resource control for java: The design and ...

引用

1st java virtual machine research and technology symposium, jvm 2001

作者： Suri, Niranjan Bradshaw, Jeffrey M. Breedy, Maggie R. Groth, Paul T. Hill, Gregory A. Saavedra, Raul Institute for Human and Machine Cognition University of West Florida United States

ISBN: (纸本)1880446111

Although java is currently riding a rising wave of popularity, current versions fail to address many of the unique challenges posed by the new generation of distributed applications. In particular the advent of peer-to-peer computing models and the proliferation of software agents motivates various requirements that go beyond the capabilities of current java virtual machines: • Full state capture. To support checkpointing and load balancing, the virtual machine (VM) must be able to capture its complete state including all threads, objects, and classes in the heap. To support requirements for strong "anytime"mobility and forced migration (such as when a host is about to go offline), the VM must be able to support asynchronous requests to capture execution state for a thread or thread group. • Dynamic access and resource control. The security model in java 2 [4] provides a fairly comprehensive model for access control but does not allow for dynamic permission revocation. Once permission is granted to a process, that permission is in effect for the lifetime of that process. Furthermore, there is no way of specifying the amount of a resource that is granted, assuring a specific quality of service for each process. For example, one would like to be able to limit the quantity of hard disk, network, or CPU usage that is available to a given process or to determine the rate at which the resource may be used. Denial-of-service conditions on a host or network resulting from code that is poorly programmed, malicious, or has been tampered with are impossible to detect and interrupt without dynamic monitoring and control mechanisms for individual processes. • Resource accounting. Tracking of resource use, based on resource control mechanisms, enables accounting and billing mechanisms that hosts can use to calculate charges for resident programs. The same mechanisms can be used to detect patterns of resource abuse. © 2001 The USENIX Association.

关键词： virtual machine

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Automatic persistent memory management for the Spotless javaTM virtual machine on the palm connected organizer 1

Automatic persistent memory management for the Spotless Java...

引用

1st java virtual machine research and technology symposium, jvm 2001

作者： Schneider, Daniel Mathiske, Bernd Ernst, Matthias Seidl, Matthew L. Sun Microsystems Inc. 901 San Antonio Road MS MTV29-112 Palo AltoCA94303-4900 United States

ISBN: (纸本)1880446111

Palm organizers are widely used in a multi-tasking fashion. Users switch from one application to another without losing the context established in either of them. Despite its obvious usefulness there is no automatic support for this convenience in the organizer's operating system, PalmOS. Programmers must implement event callbacks that use the PalmOS database API to save and reload specific application state. In this report we describe how this burden can be eliminated. We enhanced the Spotless java™ virtual machine for the Palm organizer with transparent multitasking support that automates persistence. As a consequence, running java programs can be transfered between two Palm organizers using the infra-red link. A transfered program will resume on the receiving organizer in the exact same state as it had on the sender. In addition, a HotSync operation can effectively be used to establish a checkpoint for each java program involved. Originally, the address range available for running programs was restricted to a few tens of KB in the dynamic RAM area. By directly addressing the much larger static RAM area our modified VM supports address ranges of several MB. We provide an easy-to-use protocol that leverages persistent threads for automatic life cycle control of external resources (e.g. windows, forms and databases). When applied at the library level, this protocol maintains complete persistence transparency for the application programmer. © 2001 The USENIX Association.

关键词： Multitasking

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On the software virtual machine for the real hardware stack machine 1

On the software virtual machine for the real hardware stack ...

引用

java(TM) virtual machine research and technology symposium (jvm 01)

作者： Aoki, T Eto, T Fujitsu Labs Ltd Autonomous Syst Lab Akashi Hyogo Japan

ISBN: (纸本)1880446111

Several technologies for java(1) [1] program execution have been reported, e.g., Just-in-Time (JIT) compilation, pre-compilation engine, etc., to improve its running speed. Bytecode engine is another approach by taking advantage of the hardware acceleration. This paper is concerned with the brief introduction to the picojava-II core technology and its implementation at Fujitsu. Then, we will present our software mapping approach onto the hardware stack machine, focusing on Fujitsu's picojava-II implementation, MB86799 (2). Finally, we will report some benchmark results of java virtual machine execution on the real stack machine and discuss yet unresolved problems.

关键词： Engines

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Distributed and Parallel Execution of java Programs on a DSM System 01

Distributed and Parallel Execution of Java Programs on a DSM...

引用

Proceedings of the 1st International symposium on Cluster Computing and the Grid

作者： Ting-Wei Hou Fuh-Gwo. Chen J. L. Lee Y. L. Cheng

ISBN: (纸本)9780769510101

This paper is on the loop-level parallelism of bytecode on a distributed-shared memory (DSM) system, which is built on a cluster of multiprocessors. We define a new attribute called 'Loop Attribute' to record the information of java loops. When first loading a java program, our java virtual machine, called ES-jvm, checks and analyzes the loops of the bytecode dynamically, handles the data dependence of loops, and records the information as the loop attributes. ES-jvm uses the virtual shared memory and synchronization mechanisms provided by the DSM system to maintain the memory consistency. Before ES-jvm interprets the loops of the bytecodes, it dispatches the workload of loops to the interpreter threads at all nodes according to the loop attributes and the number of threads. After distributed and parallel execution of the loops, ES-jvm continues to interpret the rest of the bytecodes of the java program. At last, ES-jvm saves the loop attributes in a new class file for the next run. Our research shows that distributed and parallel execution of loops of a java program could improve performance.

关键词： DSM system

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