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检索条件"主题词=Java Virtual Machine"

共 273 条记录，以下是21-30 订阅

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Dedicated hardware based enhancements for implementing the java virtual machine

Dedicated hardware based enhancements for implementing the J...

引用

International Conference on Embedded Systems and Applications (ESA 05)

作者： Desai, A Cain, G Singh, J Veljanovski, R Victoria Univ Technol Ctr Telecommun & Microelect Melbourne Vic Australia

ISBN: (纸本)193241553X

In spite of the popularly of java, its slow performance and unpredictable execution characteristics are still some of the most challenging issues faced by designers for real-time applications. In the past, numerous architectural enhancements have been investigated to enhance performance and increase predictability. In this paper, dedicated hardware based enhancements that can complement existing design solutions are presented. To achieve high-performance while maintaining simplicity of design, a nested state controller is used for modelling java instructions. This approach enables ahead of synthesis resource sharing and simplified reuse of functional elements. A hardware based automatic memory management sub-system is also presented that provides virtual pointer based memory access for memory allocations. Along with fixed cycle allocation and fast automatic resizing of memory, the memory controller provides predictable management functions. The paper describes a simple system targeted to the Virtex II Pro FPGA.

关键词： java virtual machine real-time java memory management nested state machines

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A Fault-Tolerant java virtual machine Using Fast Rejuvenation for Soft-Error-Prone Systems 17

A Fault-Tolerant Java Virtual Machine Using Fast Rejuvenatio...

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2015 IEEE 17th International Conference on High Performance Computing and Communications (HPCC)

作者： Ao, Qi Zhang, Longbing Chen, Shuai Fu, Jie Liao, Bin Chinese Acad Sci Inst Comp Technol State Key Lab Comp Architecture Beijing 100864 Peoples R China Chinese Acad Sci Inst Comp Technol Beijing 100864 Peoples R China Univ Chinese Acad Sci Beijing Peoples R China Loongson Technol Corp Ltd Beijing Peoples R China

ISBN: (纸本)9781479989379

To achieve better performance, computer designers employ advanced techniques that shrink feature sizes, lower supply voltage, increase clock rates and memory capacity, and meanwhile modern computers become increasingly vulnerable to soft errors caused by energetic particles, such as alpha particles and neutron strikes. Therefore, fault tolerance evolves into one of the most significant design objectives, especially for embedded systems working under extreme environments, such as space project. Techniques both in hardware and software are presented. Most of these techniques, however, either require extra resources (e.g. redundant component) or cause great performance degradation. In this paper, we propose a novel fault tolerant technique for java virtual machine (JVM) called the warm-JVM rejuvenation, which can proactively correct soft errors. This approach periodically performs JVM rejuvenation during the execution of java applications. The experiments show that our approach can improve the JVM reliability and maintain performance and response time.

关键词： java virtual machine Software Rejuvenation Soft Error Reliability

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A Hybrid Approach to java virtual machine Used in Wireless Sensor Networks 11

A Hybrid Approach to Java Virtual Machine Used in Wireless S...

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11th International Conference on Software, Knowledge, Information Management and Applications (SKIMA)

作者： Bista, Rabindra Aryal, Sapan Kathmandu Univ Dept Comp Sci Dhulikhel Kavre Nepal

ISBN: (纸本)9781538646021

Wireless Sensor Networks (WSN) have become highly attractive subject among researchers due to its wide area of uses. Developing applications for sensor nodes still remain a cumbersome task due to issues such as its heterogeneous nature, lack of low-level abstractions and lack of proper programming interfaces. To solve these issues, different virtual machines (VM) have been proposed to be used as middleware. A VM can be application specific in nature which supports instructions that directly addresses the domain specific problem or it can be general purpose which supports general programming instructions. This research work studies the possibility of adding concepts of application specific virtual machine to general purpose one. We have attempted to do so by providing a single bytecode implementation for some methods that are used frequently in WSN applications. To test our approach we have decided to use an existing java virtual machine (JVM) implementation for WSN platform. The result is significant decrease in application binary size.

关键词： Wireless Sensor Network Middleware java virtual machine Bytecode Bytecode Replacement Storage efficiency

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HVM_TP: A time predictable and portable java virtual machine for hard real-time embedded systems 14

HVM<sub>TP</sub>: A time predictable and portable java virtu...

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12th International Workshop on java Technologies for Real-Time and Embedded Systems (JTRES)

作者： Luckow, Kasper Soe Thomsen, Bent Korsholm, Stephan Erbs Aalborg Univ Dept Comp Sci Aalborg Denmark VIA Univ Coll Horsens Denmark

ISBN: (纸本)9781450328135

We present HVMTP, a time predictable and portable java virtual machine (JVM) implementation with applications in resource-constrained, hard real-time embedded systems, which implements all levels of the safety critical java (SCJ) specification. Time predictability is achieved by a combination of time-predictable algorithms, exploiting the programming model of the SCJ profile and harnessing static knowledge of the hosted SCJ system. This paper presents HVMTP in terms of its design and capabilities and demonstrates how a complete timing model of the JVM represented as a network of timed automata can be obtained using the tool TETASARTS(JVM). The timing model readily integrates with the rest of the TETASARTS tool set for temporal verification of SCJ systems. We will also show how a complete timing scheme in terms of safe worst-case execution times and best-case execution times of the java bytecodes can be derived from the model. Furthermore, we take a first look at how to support the new java 8 language feature of Lambda expressions in a SCJ context - we look in particular at how the invokedynamic bytecode can be implemented in a time-predictable way and integrated in HVMTP. Copyright (c) 2016 John Wiley & Sons, Ltd.

关键词： java virtual machine real-time java time predictability model checking

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P³ : A Profiler Suite for Parallel Applications on the java virtual machine 18th

P<SUP>3</SUP> : A Profiler Suite for Parallel Applications o...

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18th Asian Symposium on Programming Languages and Systems (APLAS)

作者： Rosa, Andrea Binder, Walter Univ Svizzera Italiana USI Fac Informat Lugano Switzerland

ISBN: (纸本)9783030644369;9783030644376

We present P-3, a new profiler suite for parallel applications on the java virtual machine. P-3 specifically targets metrics related to parallelism, concurrency, and synchronization. In particular, P-3 profiles the use of concurrent entities (e.g., threads, tasks, actors, futures), constructs and classes to implement synchronization (including locks, thread parking, and the synchronizers from the *** package), lock-free operations (such as atomic and volatile memory accesses), as well as synchronized and concurrent collections. To the best of our knowledge, our suite is the first tool detecting the use of volatile memory accesses, futures, synchronizers, and utility classes commonly used in concurrent programming. Moreover, P-3 incurs only moderate profiling overhead. P-3 can be readily applied to popular benchmark suites and to public code repositories, facilitating new analyses in the wild. We describe the design and implementation of P-3 and discuss how our tool was fundamental in the selection of workloads composing the Renaissance benchmark suite. Moreover, we use P-3 to analyze the variability of different metrics for multiple iterations of the Renaissance benchmarks.

关键词： Profiling Parallelism Concurrency Synchronization java virtual machine

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PERSISTENT MEMORY AND ORTHOGONAL PERSISTENCE: A PERSISTENT HEAP DESIGN AND ITS IMPLEMENTATION FOR THE java virtual machine

PERSISTENT MEMORY AND ORTHOGONAL PERSISTENCE: A PERSISTENT H...

引用

作者： TACIANO DRECKMANN PEREZ PONTIFICAL CATHOLIC UNIVERSITY OF RIO GRANDE DO SUL

学位级别：博士

Current computer systems separate main memory from storage. Programming languages typically reflect this distinction using different representations for data in memory (e. g. data structures, objects) and storage (e. g. files, databases). Moving data back and forth between these different layers and representations compromise both programming and execution efficiency. Recent non- volatile memory technologies, such as Phase-Change Memory, Resistive RAM, and Magnetoresistive RAM make it possible to collapse main memory and storage into a single layer of persistent memory, opening the way for simpler and more efficient programming abstractions for handling persistence. This Ph. D. thesis introduces a design for the runtime environment for languages with automatic memory management, based on an original combination of orthogonal persistence, persistent memory programming, persistence by reachability, and lock-based failure-atomic transactions. Such design can significantly increase programming and execution efficiency, as in-memory data structures are transparently persistent, without the need for programmatic persistence handling, and removing the need for crossing semantic boundaries. In order to validate and demonstrate the proposed concepts, this work also presents JaphaVM, the first java virtual machine specifically designed for persistent memory. In experimental results using benchmarks and real-world applications, JaphaVM in most cases executed the same operations between one and two orders of magnitude faster than database- and file-based implementations, while requiring significantly less lines of code.

关键词： Non-Volatile Memory Storage-Class Memory Persistent Memory Orthogonal Persis-tence java java virtual machine

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Optimization of java virtual machine with safe-point Garbage Collection

Optimization of Java Virtual Machine with safe-point Garbage...

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10th IEEE International Symposium on Consumer Electronics (ISCE 2006)

作者： Rogov, Sergey V. Kirillin, Viacheslav A. Sidelnikov, Victor V. St Petersburg Electrotech Univ St Petersburg Russia

ISBN: (纸本)1424402158

The paper reveals several inconsistencies of java virtual machine with safe point Garbage Collection, which may incur performance penalties. Two ways of solving these shortcomings are discussed and the most preferable is chosen for implementation. Optimized prototype of Connected Device Configuration virtual machine was benchmarked by the set of java Hartstone experiments, which results confirm advantages of chosen solution. Proposed optimization is highly applicable, transparent and simple to understand.

关键词： java virtual machine garbage collection threading model soft real-time

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"Slimming" a java virtual machine by way of cold code removal and optimistic partial program loading

"Slimming" a Java virtual machine by way of cold code remova...

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6th International Conference on the Principles and Practice of Programming in java (PPPJ 2008)

作者： Wagner, Gregor Gal, Andreas Franz, Michael Univ Calif Irvine Irvine CA 92697 USA

Embedded systems provide limited storage capacity. This limitation conflicts with the demands of modern virtual machine platforms, which require large amounts of library code to be present on each client device. These conflicting requirements are often resolved by providing specialized embedded versions of the standard libraries, but even these stripped down libraries consume significant resources. We present a solution for "always connected" mobile devices based on a zero footprint client paradigm. In our approach, all code resides on a remote server. Only those parts of applications and libraries that are likely to be needed are transferred to the mobile client device. Since it is difficult to predict statically which library parts will be needed at run time, we combine static analysis, opportunistic off-target linking and lazy code loading to transfer code with a high likelihood of execution ahead of time while the other code, such as exception code, remains on the server and is transferred only on demand. This allows us to perform not only dead code elimination, but also aggressive elimination of unused code. The granularity of our approach is flexible from class files all the way down to individual basic blocks. Our method achieves total code size reductions of up to 95%. (C) 2010 Elsevier B.V. All rights reserved.

关键词： java virtual machine Just-in-time compilation Embedded connected devices Cold code removal

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On the design of the local variable cache in a hardware translation-based java virtual machine 05

On the design of the local variable cache in a hardware tran...

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Conference on Languages, Compilers and Tools for Embedded Systems

作者： Oi, H Univ Aizu Dept Comp Sci Aizu Wakamatsu Japan

ISBN: (纸本)9781595930187

Hardware bytecode translation is a technique to improve the performance of the java virtual machine (JVM), especially on the portable devices for which dynamic compilation is infeasible. However, since the translation is done on a single bytecode basis, it is likely to generate frequent memory accesses for local variables which can be a performance bottleneck. In this paper, we propose to add a small register file to the datapath of the hardware-translation based JVM and use it as a local variable cache. We evaluate the effectiveness of the local variable cache against the size of the local variable cache which determines the chip area overhead and the operating speed. We also discuss the mechanisms for the efficient parameter passing and the on-the-fly profiling. With two types of exceptions, a 16-entry local variable cache achieved hit ratios of 60 to 98 %. The first type of exceptions is represented by the FFT, which accesses more than 16 local variables. In this case, on-the-fly profiling was effective. The hit ratio of 16-entry cache for the FFT was increased from 44 to 83 %. The second type of exception is represented by the SAXON XSLT processor for which cold misses were significant. The proposed parameter passing mechanism turned 6.4 to 13.3 % of total accesses from miss to hit to the local variable cache.

关键词： java virtual machine hardware-translation memory hierarchy

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Automated Runtime Transition between virtual and Platform Threads in the java virtual machine 30

Automated Runtime Transition between Virtual and Platform Th...

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30th Asia-Pacific Software Engineering Conference (APSEC)

作者： Rosa, Andrea Basso, Matteo Bohnhoff, Leonardo Binder, Walter Univ Svizzera Italiana USI Lugano Switzerland

ISBN: (纸本)9798350344172

virtual threads are a new feature of the java virtual machine (JVM) complementing the regular java threads (called platform threads). virtual threads promise a significant throughput improvement in workloads that make intensive use of blocking operations, but incur performance overheads in CPU-bound workloads, due to the cost of creating and maintaining the data structures associated with them. Hence, the optimal choice between platform and virtual threads depends on application behavior (which can change significantly during the execution) and on the system running the application. This work-in-progress paper proposes a new framework to automatically and adaptively select the type of threads created by an application, switching between platform and virtual threads as the application's behavior changes over time. The framework monitors several metrics of the running application. Based on these metrics, users can specify criteria for deciding when virtual threads should be preferred over platform threads and vice versa. We present a use case on the Eclipse Jetty web server. Our preliminary evaluation shows that the framework selects the thread type yielding the highest throughput depending on the application behavior, without introducing performance drawbacks.

关键词： virtual threads platform threads multithreading adaptive system java virtual machine

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