检索结果-内蒙古大学图书馆

Reflexes: Abstractions for Integrating Highly Responsive Tasks into java Applications

ACM TRANSACTIONS ON EMBEDDED COMPUTING SYSTEMS 2010年第1期10卷 4-4页

作者： Spring, Jesper Honig Pizlo, Filip Privat, Jean Guerraoui, Rachid Vitek, Jan Ecole Polytech Fed Lausanne IC IIF LPD EPFL CH-1015 Lausanne Switzerland Purdue Univ Dept Comp Sci W Lafayette IN 47907 USA

Achieving submillisecond response times in a managed language environment such as java or C# requires overcoming significant challenges. In this article, we propose Reflexes, a programming model and runtime system infrastructure that lets developers seamlessly mix highly responsive tasks and timing-oblivious java applications. Thus enabling gradual addition of real-time features, to a non-real-time application without having to resort to recoding the real-time parts in a different language such as C or Ada. Experiments with the Reflex prototype implementation show that it is possible to run a real-time task with a period of 45 mu s with an accuracy of 99.996% (only 0.001% worse than the corresponding C implementation) in the presence of garbage collection and heavy load ordinary java threads.

关键词： Languages Experimentation Real-time systems java virtual machine memory management

来源：评论

学校读者我要写书评

暂无评论

Research on stack-allocation based JVM garbage collection

Research on stack-allocation based JVM garbage collection

引用

International Conference on Advanced Computer Theory and Engineering, ICACTE

作者： Xiaoliang Xu Jiang Shen College of Computer Science Hangzhou Dianzi University Hangzhou Zhejiang China

ISBN: (纸本)9781424465392;9781424465422

In order to reduce the costs of java virtual machine garbage collector, a stack-allocation based on garbage collection algorithm is proposed in this paper. The stack frame is improved to support the object storage, and the stackable objects are identified with expanded byte code when the compiler compiles the java source code. The stackable objects are allocated to java stack and released instantly when they leave their scope, and the other objects are still allocated to heap and released by garbage collector. Experimental result shows, compared to traditional garbage collector, that new algorithm improves the performance of memory allocating and releasing, reduces the burden of garbage collector, and runs faster.

关键词： java virtual machine garbage collection stack allocation waste collection java virtual machine (JVM) stacked structure address byte heap compilers

来源：评论

学校读者我要写书评

暂无评论

java™ on the bare metal of wireless sensor devices: the squawk java virtual machine 06

Java™ on the bare metal of wireless sensor devices: the squ...

引用

Proceedings of the 2nd international conference on virtual execution environments

作者： Doug Simon Cristina Cifuentes Dave Cleal John Daniels Derek White Sun Microsystems Laboratories Menlo Park CA Sun Microsystems Laboratories Brisbane Australia Syntropy Limited Kent UK Sun Microsystems Laboratories Burlington MA

ISBN: (纸本)9781595933324

The Squawk virtual machine is a small java™ virtual machine (VM) written mostly in java that runs without an operating system on a wireless sensor platform. Squawk translates standard class file into an internal pre-linked, position independent format that is compact and allows for efficient execution of bytecodes that have been placed into a read-only memory. In addition, Squawk implements an application isolation mechanism whereby applications are represented as object and are therefore treated as first class objects (i.e., they can be reified). Application isolation also enables Squawk to run multiple applications at once with all immutable state being shared between the applications. Mutable state is not shared. The combination of these features reduce the memory footprint of the VM, making it ideal for deployment on small *** provides a wireless API that allows developers to write applications for wireless sensor networks (WSNs), this API is an extension of the generic connection framework (GCF). Authentication of deployed files on the wireless device and migration of applications between devices is also performed by the *** paper describes the design and implementation of the Squawk VM as applied to the Sun™ Small Programmable Object Technology (SPOT) wireless device; a device developed at Sun Microsystems Laboratories for experimentation with wireless sensor and actuator applications.

关键词： Sun SPOT java virtual machine wireless sensor networks IEEE 802.15.4 embedded systems

来源：评论

学校读者我要写书评

暂无评论

Improving java performance and energy dissipation through efficient code caching

引用

DESIGN AUTOMATION FOR EMBEDDED SYSTEMS 2009年第3期13卷 179-192页

作者： Sun, Yu Zhang, Wei So Illinois Univ Dept Elect & Comp Engn Carbondale IL 62901 USA

Traditional java code generation and instruction fetch path is not efficient, as java binary code is typically written into the data cache first, and then is loaded into the instruction cache through the shared L2 cache or memory, which takes both time and energy. In this paper, we study three hardware-based code caching strategies, which attempt to write and read the dynamically generated java code faster and more energy-efficiently. Our experimental results indicate that with proper architectural support, writing code directly into the instruction cache can improve the performance for a variety of java applications by 9.6% on average, with up to 42.9%. Also, the average energy dissipation of these java programs can be reduced by 6% with efficient code caching.

关键词： java virtual machine Code caching Performance Energy consumption

来源：评论

学校读者我要写书评

暂无评论

Client ahead-of-time compiler for embedded java platforms

引用

SOFTWARE-PRACTICE & EXPERIENCE 2009年第3期39卷 259-278页

作者： Hong, Sunghyun Kim, Jin-Chul Moon, Soo-Mook Shin, Jin Woo Lee, Jaemok Oh, Hyeong-Seok Choi, Hyung-Kyu Seoul Natl Univ Sch Elect Engn & Comp Sci Seoul 151742 South Korea

Many embedded java platforms execute two types of java classes: those installed statically on the client device and those downloaded dynamically from service providers at run time. For achieving higher performance, the static java classes can be compiled into machine code by ahead-of-time compiler (AOTC) in the server, and the translated machine code can be installed on the client device. Unfortunately, AOTC cannot be applicable to the dynamically downloaded classes. This paper proposes client-AOTC (c-AOTC), which performs AOTC on the client device using the just-in-time compiler (JITC) module installed on the device, obviating the JITC overhead and complementing the server-AOTC. The machine code of a method translated by JITC is cached on a persistent memory of the device, and when the method is invoked again in a later run of the program, the machine code is loaded and executed directly without any translation overhead. A major issue in c-AOTC is relocation because sonic of the address constants embedded in the cached machine code are not correct when the machine code is loaded and used in a different run;those addresses should be corrected before they are used. Constant pool resolution and inlining complicate the relocation problem, and we propose our solutions. The persistent memory overhead for saving the relocation information is also an issue, and we propose a technique to encode the relocation information and compress the machine code efficiently. We developed a c-AOTC on Sun's CDC VM reference implementation, and our evaluation results indicate that c-AOTC can improve the performance significantly, as much as an average of 12% for EEMBC and 4% for SpecJVM98, with a persistent memory overhead of 1% on average. Copyright (c) 2008 John Wiley & Sons, Ltd.

关键词： java ahead-of-time compiler just-in-time compiler relocation early binding java virtual machine J2ME CDC

来源：评论

学校读者我要写书评

暂无评论

Scala and Lift - Functional Recipes for the Web

引用

IEEE INTERNET COMPUTING 2009年第3期13卷 88-92页

作者： Ghosh, Debasish Vinoski, Steve Anshinsoft Verivue

Today, there's significant interest in functional languages and frameworks that fit the Web better than imperative languages. We explore Scala, an OO-functional language on the java virtual machine, and Lift, a framework implemented on Scala's functional features. The Scala language offers functional programming features and asynchronous message-passing concurrency alongside a statically typed model. Lift exploits this model to offer secure, higher-level abstractions to Web developers.

关键词： Internet java concurrency control functional languages functional programming message passing object-oriented languages object-oriented programming virtual machines java virtual machine Lift Scala World Wide Web asynchronous message-passing concurrency higher-level abstractions object-oriented-functional language actor closure functional Web functional language pattern match Pattern matching object oriented programming Functional programming World Wide Web Internets Concurrency control level of abstraction Object oriented programming languages java virtual machine (JVM) actor lift message passing

来源：评论

学校读者我要写书评

暂无评论

Optimizing Aspectual Execution Mechanisms for Embedded Applications

引用

ELECTRONIC NOTES IN THEORETICAL COMPUTER SCIENCE 2009年第2期238卷 35-45页

作者： Hundt, Christine Glesner, Sabine Tech Univ Berlin Inst Software Technol & Theoret Comp Sci D-10587 Berlin Germany

Applications for small embedded mobile devices are becoming larger and more complex resulting in the need for advanced modularization mechanisms. Aspect-oriented modularization is a promising approach to solve this problem, but the overhead of the existing programming languages restricts their practicability for small devices with limited resources. In this paper, we identify opportunities to optimize the aspectual execution mechanism at different levels within the virtual machine. First experiments show that these optimizations improve the execution time considerably, thus proving that with adequate optimizations, we enable the use of advanced aspect-oriented modularization techniques for small device java applications.

关键词： aspect-orientation embedded systems mobile devices java virtual machine optimization

来源：评论

学校读者我要写书评

暂无评论

A java Software Stack for Resource Poor Sensor Nodes Towards Peer-to-Peer Jini

A Java Software Stack for Resource Poor Sensor Nodes Towards...

引用

4th International Conference on Embedded and Multimedia Computing

作者： Costa, Nuno Pereira, Antonio Serodio, Carlos Polytech Inst Leiria CIIC Super Sch Technol & Management P-2411901 Alto Do Vieiro Leiria Portugal CITAB UTAD University Quinta dos Prados P-5000 Vila Real Portugal

ISBN: (纸本)9781424449965

Sensor networks have been referred to as part of the background infrastructure required to achieve ubiquitous computing. This has recently promoted a considerable amount of attention from the research community that concluded that existing protocols and techniques for service discovery, such as JINI or UPnP are not suitable for the case of resource poor, battery-powered sensor nodes. We do not really agree with this approach. We think that those protocols could be a good starting point to "power-up" sensor nodes with poor resources for ubiquitous computing support. Starting from this principle and recognizing that existing sensor node system software is not suitable for our purpose, we decided to build a new sensor node software stack. The result was a stand-alone java virtual machine, suitable for sensor nodes with poor resources, an implementation of the ubiquitous TCP/IP communication stack and Jini based middleware to achieve automatic service discover and usage. This software stack was tailored to perfectly fit in the state-of-the-art Mica2 class of sensor nodes.

关键词： Ubiquitous Computing Sensor Networks System Software Software Stack Operating System java virtual machine

来源：评论

学校读者我要写书评

暂无评论

Design Space Exploration for java Processors with Cross-Profiling

Design Space Exploration for Java Processors with Cross-Prof...

引用

6th International Conference on the Quantitative Evaluation of Systems

作者： Schoeberl, Martin Binder, Walter Moret, Philippe Villazon, Alex Vienna Univ Technol Inst Comp Engn Vienna Austria Univ Lugano Fac Informat Lugano Switzerland

ISBN: (纸本)9780769538082

Most processors are used in embedded systems, where the processor architectures are diverse due to optimizations for different application domains. The main challenge for embedded system processors is the right balance between performance and chip size, which directly relates to cost. An early estimation of the performance for a new design is of paramount importance. In this paper we propose cross-profiling for that performance estimation, which can be accomplished very early in the design phase. We evaluate our approach in the context of a java processor for embedded systems using cross-profiling on a standard desktop java virtual machine. We explore the performance impact of various processor design choices and optimizations, such as different caches strategies or pipeline organizations, and come up with an improved processor design that yields speedups of up to 40% on standard java benchmarks. Comparing the generated cross-profiles with the execution of benchmarks in real hardware confirms that our approach is sound.

关键词： processor architecture evaluation embedded systems cross-profiling java virtual machine

来源：评论

学校读者我要写书评

暂无评论

Cross-Input Learning and Discriminative Prediction in Evolvable virtual machines 09

Cross-Input Learning and Discriminative Prediction in Evolva...

引用

7th International Symposium on Code Generation and Optimization

作者： Mao, Feng Shen, Xipeng Coll William & Mary Dept Comp Sci Williamsburg VA 23185 USA

ISBN: (纸本)9780769535760

Modern languages like java and C# rely on dynamic optimizations in virtual machines for better performance. Current dynamic optimizations are reactive. Their performance is constrained by the dependence on runtime sampling and the partial knowledge of the execution. This work tackles the problems by developing a set of techniques that make a virtual machine evolve across production runs. The virtual machine incrementally learns the relation between program inputs and optimization strategies so that it proactively predicts the optimizations suitable for a new run. The prediction is discriminative, guarded by confidence measurement through dynamic self-evaluation. We employ an enriched extensible specification language to resolve the complexities in program inputs. These techniques, implemented in Jikes RVM, produce significant performance improvement on a set of java applications.

关键词： Cross-Input Learning java virtual machine Evolvable Computing Adaptive Optimization Input-Centric Optimization Discriminative Prediction

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：