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检索条件"主题词=Java Virtual Machine"

共 273 条记录，以下是251-260 订阅

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MicroJIT: a case for templated just-in-time compilation in constrained environments 20

MicroJIT: a case for templated just-in-time compilation in c...

引用

Proceedings of the 30th Annual International Conference on Computer Science and Software Engineering

作者： Eric Coffin Scott Young Harpreet Kaur Julie Brown Marius Pirvu Kenneth B. Kent University of New Brunswick Fredericton NB Canada IBM Canada Toronto ON Canada

Modern software libraries and applications often need to be shared across environments that do not always share common architectures. The solution to this code sharing has often been to target managed runtime environments, or High-Level Language virtual machines, such as the java virtual machine. These runtimes are often implemented using a process called interpretation. Interpreters are significantly slower than natively executed code. One way that runtimes have addressed this problem is by including a compiler that compiles the input programs into native code at runtime. These Just-in-Time compilers can be categorized into two classes, optimizing and templated. Optimizing compilers take longer to compile and require many supporting data structures to allow for their optimizations, but usually produce (often significantly) faster code. Templated compilers always generate the same code for a given block of input. This template-generated code is faster than interpreting, but usually (often significantly) slower than the code generated by an optimizing compiler. However, these compilers do not require the heavier data structures of optimizing compilers, and produce code much more quickly. For constrained environments, such as those found in containers and Internet of Things devices, where the resources available to the managed runtime are limited, the ability to perform lightweight JIT compilation may be desirable. In this paper, we introduce a templated compiler called MicroJIT into the Eclipse OpenJ9 JVM and compare it to an interpreter-only solution in a resource constrained environment. Although our bytecode coverage is not complete, we demonstrate significant performance improvements over the interpreter for our micro-benchmarks, while at the same time, compiling with less overhead than the default JIT compiler in Eclipse OpenJ9.

关键词： optimization constrained environment internet of things java virtual machine bytecode just-in-time compilation

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Exploiting Multi-Core Processors to Improve Time Predictability for Real-time java Computing

Exploiting Multi-Core Processors to Improve Time Predictabil...

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IEEE International Conference on Embedded and Real-Time Computing Systems and Applications

作者： Yu Sun Wei Zhang Department of Electrical and Computer Engineering Southern Illinois University Carbondale Carbondale

ISBN: (纸本)9781424449316

As a successful programming language, java has extended its application from general-purpose systems to embedded, real-time systems. However, some of java's excellent features, like automatic memory management and dynamic compilation, bring indeterminism to the execution time of real-time java programs. In this paper, we propose several multi-core approaches to remove or at least reduce the unpredictability inside of java virtual machine (JVM). Our goal is to retain high performance competitive to dynamic compilation and, at the same time, obtain better time predictability for JVM. Also, we study pre-compilation techniques to utilize second core more efficiently. Furthermore, we develop Pre-optimization on Another Core (PoAC) scheme to replace the Adaptive Optimization System (AOS) in Jikes JVM, which is very sensitive to execution time variation and impacts time predictability greatly. The experimental results indicate that our approaches are able to reach high performance while greatly reduce execution time variation of java applications.

关键词： Time predictability java virtual machine Multicore processors Adaptive optimizations

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An Object-Oriented Processor with Just-In-Time Compilation Support

An Object-Oriented Processor with Just-In-Time Compilation S...

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2010 International Symposium on Computer,Communication, Control and Automation

作者： Anthony S.Fong C.H.Yau City University of Hong Kong

java is dominating in object-oriented computing. However, java relies on java virtual machine to process java bytecodes, such that it imposes large overhead on the embedded system. In addition, as security is always a major concern in most of the networked computer systems, embedded systems should provide security features to defend against attacks. Many viruses use the security loopholes to trigger attack, such as buffer overflow attack. This paper proposes an object-oriented processor with Just-In-Time compilation support to execute java program effectively and to protect the system. The system realizes the inherent security features of java in the core architecture to enhance the overall system security.

关键词： Object-Oriented processor java virtual machine Just-In-Time compilation

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Multitasking without comprimise: a virtual machine evolution 01

Multitasking without comprimise: a virtual machine evolution

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Proceedings of the 16th ACM SIGPLAN conference on Object-oriented programming, systems, languages, and applications

作者： Grzegorz Czajkowski Laurent Daynès Sun Microsystems Laboratories 2600 Casey Avenue Mountain View CA

ISBN: (纸本)9781581133356

The multitasking virtual machine (called from now on simply MVM) is a modification of the java virtual machine. It enables safe, secure, and scalable multitasking. Safety is achieved by strict isolation of application from one another. Resource control augment security by preventing some denial-of-service attacks. Improved scalability results from an aggressive application of the main design principle of MVM: share as much of the runtime as possible among applications and replicate everything else. The system can be described as a 'no compromise'approach --- all the known APIs and mechanisms of the java programming language are available to applications. MVM is implemented as a series of carefully tuned modifications to the java HotSpot virtual machine, including the dynamic compiler. this paper presents the design of MVM, focusing on several novel and general techniques: an in-runtime design of lightweight isolation, an extension of a copying, generational garbage collector to provide best-effort management of a portion of the heap space, and a transparent and automated mechanism for safe execution of user-level native code. MVM demonstrates that multitasking in a safe language can be accomplished with a high degree of protection, without constraining the language, and and with competitive performance characteristics

关键词： resource control native code execution application isolation java virtual machine

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An Efficient and Generic Event-based Profiler Framework for Dynamic Languages 15

An Efficient and Generic Event-based Profiler Framework for ...

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Proceedings of the Principles and Practices of Programming on The java Platform

作者： Gülfem Savrun-Yeniçeri Michael L. Van de Vanter Per Larsen Stefan Brunthaler Michael Franz University of California Irvine Oracle Labs

ISBN: (纸本)9781450337120

Profilers help programmers analyze their programs and identify performance bottlenecks. We implement a profiler framework that helps to compare and analyze programs implementing the same algorithms written in different languages. Profiler implementers replicate common functionalities in their language profilers. We focus on building a generic profiler framework for dynamic languages to minimize the recurring implementation effort. We implement our profiler in a framework that optimizes abstract syntax tree (AST) interpreters using a just-in-time (JIT) compiler. We evaluate it on ZipPy and JRuby+Truffle, Python and Ruby implementations in this framework, respectively. We show that our profiler runs faster than the existing profilers in these languages and requires modest implementation effort. Our profiler serves three purposes: 1) helps users to find the bottlenecks in their programs, 2) helps language implementers to improve the performance of their language implementation, 3) helps to compare and evaluate different languages on cross-language benchmarks.

关键词： abstract syntax tree interpreters PyPy Ruby Profiling JRuby dynamic languages java virtual machine Python

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An Instruction Cache Architecture for Parallel Execution of java Threads

An Instruction Cache Architecture for Parallel Execution of ...

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The Fourth International Conference on Parallel and Distributed Computing, Applications and Technologies

作者： Wanming Chu Yamin Li Department of Computer Hardware University of Aizu Aizu-Wakamatsu 965-8580 Japan Department of Computer Science Hosei University Tokyo 184-8584 Japan

＜正＞Designing a java processor supporting horizontal multithreading has been becoming more attractive as network computing gains *** from the traditional superscalar processors that issue multiple instructions from a single instruction stream to exploit the instruction level parallelism（ILP）,the horizontal multithreading java processors issue multiple instructions （bytecodes） from multiple threads in parallel to exploit not only the ILP but the thread level parallelism（TLP）.Such processors have multiple dispatch slots and require the instruction fetch unit to supply instructions with much higher bandwidth than superscalar *** a traditional superscalar cache architecture in a horizontal multithreading java processor results in high cache miss ratio caused by the interference among the *** paper investigates multibank instruction cache architecture for horizontal multithreading java processor to meet the requirements of the high instruction fetch *** order to evaluate the cache performance as well as the horizontal multithreading java processor performance,we developed a trace driven *** simulator consists of a trace generator that generates the java bytecode execution traces and an architectural simulator that reads the traces and evaluates the performance of the instruction cache and the overall performance of the java processor. Our simulation results show that the performance improvements are obtained by the low cache miss ratio and the high instruction fetch bandwidth of the proposed cache *** IPC performance is about 19 when both the number of slots and the number of banks are 8,about 5 times better than one bank cache.

关键词： Cache java virtual machine java processor instruction level parallelism thread level parallelism multithreading performance evaluation trace-driven simulation

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A monitor-based synchronization approach for java packed objects 15

A monitor-based synchronization approach for Java packed obj...

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Proceedings of the 25th Annual International Conference on Computer Science and Software Engineering

作者： Bing Yang Kenneth B. Kent Eric Aubanel Karl Taylor University of New Brunswick NB Canada IBM Ottawa Ottawa ON Canada

Packed object support is an experimental enhancement for java in the IBM J9 virtual machine. In this paper we present a synchronization approach for the packed object data model, which is monitor-based, but in a lockword-free manner. This approach seeks to address the distinctive synchronization issues and situations which are faced by the packed object data model and have never been addressed by traditional java built-in synchronization mechanisms before. According to the experimental results, our approach performs much better than the java built-in synchronization for coarse-grained locking. The time overhead is reduced by 18% for the PackedSync approach. For fine-grained locking, although the performance of our approach is overtaken by the java built-in synchronization as array sizes and the number of threads increase, PackedSync performs reasonably similar while array sizes and thread numbers are small.

关键词： java virtual machine multi-granularity locking packed object data model java synchronization

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An Instruction Cache Architecture for Parallel Execution of java Threads

An Instruction Cache Architecture for Parallel Execution of ...

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Proceedings of The Fourth International Conference on Parallel and Distribyted Computing,Applications and Technologies(第四届并行与分布式计算应用与技术国际会议)

作者： Wanming Chu Yamin Li Department of Computer Hardware University of Aizu Aizu-Wakamatsu 965-8580 Japan Department of Computer Science Hosei University Tokyo 184-8584 Japan

ISBN: (纸本)0780378407

Designing a java processor supporting horizontal multithreading has been becoming more attractive as network computing gains importance. Different from the traditional superscalar processors that issue multiple instructions from a single instruction stream to exploit the instruction level parallelism (ILP), the horizontal multithreading java processors issue multiple instructions (bytecodes) from multiple threads in parallel to exploit not only the ILP but the thread level parallelism (TLP). Such processors have multiple dispatch slots and require the instruction fetch unit to supply instructions with much higher bandwidth than superscalar processors. Using a traditional superscalar cache architecture in a horizontal multithreading java processor results in high cache miss ratio caused by the interference among the threads. This paper investigates multibank instruction cache architecture for horizontal multithreading java processor to meet the requirements of the high instruction fetch bandwidth. In order to evaluate the cache performance as well as the horizontal multithreading java processor performance, we developed a trace driven simulator. The simulator consists of a trace generator that generates the java bytecode execution traces and an architectural simulator that reads the traces and evaluates the performance of the instruction cache and the overall performance of the java *** simulation results show that the performance improvements are obtained by the low cache miss ratio and the high instruction fetch bandwidth of the proposed cache architecture. The IPC performance is about 19 when both the number of slots and the number of banks are 8, about 5 times better than one bank cache.

关键词： Cache java virtual machine java processor instruction level parallelism thread level parallelism multithreading performance evaluation trace-driven simulation

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Compiling scheme to JVM bytecode:: a performance study 02

Compiling scheme to JVM bytecode:: a performance study

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Proceedings of the seventh ACM SIGPLAN international conference on Functional programming

作者： Bernard Paul Serpette Manuel Serrano Inria Sophia-Antipolis Sophia-Antipolis Cedex France

ISBN: (纸本)9781581134872

We have added a java virtual machine (henceforth JVM) bytecode generator to the optimizing Scheme-to-C compiler Bigloo. We named this new compiler BiglooJVM. We have used this new compiler to evaluate how suitable the JVM bytecode is as a target for compiling strict functional languages such as Scheme. In this paper, we focus on the performance issue. We have measured the execution time of many Scheme programs when compiled to C and when compiled to JVM. We found that for each benchmark, at least one of our hardware platforms ran the BiglooJVM version in less than twice the time taken by the Bigloo version. In order to deliver fast programs the generated JVM bytecode must be carefully crafted in order to benefit from the speedup of just-in-time compilers.

关键词： compilation scheme java virtual machine functional languages

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Performance analysis for languages hosted on the truffle framework 18

Performance analysis for languages hosted on the truffle fra...

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Proceedings of the 15th International Conference on Managed Languages & Runtimes

作者： Swapnil Gaikwad Andy Nisbet Mikel Luján University of Manchester Manchester UK

ISBN: (纸本)9781450364249

It is attractive to host new or existing language implementations on top of, or reusing components of, existing managed language runtimes such as the java virtual machine (JVM) or the Microsoft Common Language Infrastructure (CLI). A benefit is that software development effort may be reduced, as only one managed language runtime needs to be optimised and maintained, instead of a separate compiler/runtime for each language *** example, the Truffle framework combined with a JVM offers support for executing javascript, Ruby, R, LLVM IR-compiled languages, etc., as well as supporting the execution of applications combining multiple programming languages within a Polyglot application. In trying to understand the runtime performance of Sulong (i.e. the Truffle project which enables LLVM IR execution), we found a lack of tools and guidance. A similar situation is found for benchmarks written in Ruby and R when executed as Truffle hosted languages. Further, it is non-trivial to relate performance back to the hosted language source code, and to determine whether JVM service overheads, such as garbage collection or JIT compilation, are *** describe how to visually analyse the performance of Truffle-hosted languages based on Flamegraphs, allowing time to be related to sampled call-stacks. We use the Linux tool perf and the JVM agent perf-map-agent, along with enhancements to the Graal JIT compiler that map sampled call-stacks onto JVM-hosted guest language source code. This paper demonstrates the ease and flexibility of using these modified tools, with low overhead during execution time. We also illustrate applicability of the techniques to understand the performance of Polyglot applications.

关键词： R ruby profiling java virtual machine

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