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检索条件"任意字段=Proceedings of the ACM SIGPLAN 2002 conference on Programming language design and implementation"

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Object views: language support for intelligent object caching in parallel and distributed computations 99

Object views: language support for intelligent object cachin...

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proceedings of the 14th acm sigplan conference on Object-oriented programming, systems, languages, and applications

作者： Ilya Lipkind Igor Pechtchanski Vijay Karamcheti Courant Institute of Mathematical Sciences New York University 715 Broadway 7th Floor New York NY

ISBN: (纸本)9781581132380

Object-based parallel and distributed applications are becoming increasingly popular, driven by the programmability advantages of component technology and a flat shared-object space. However, the flat shared-object space introduces a performance challenge: applications that rely on the transparent coherent caching of objects achieve high performance only on tightly coupled parallel machines. In distributed environments, the overheads of object caching force application designers to choose other solutions. Consequently, most applications sacrifice programmability, relying instead on either the explicit coherence management of cached objects, or on vastly different middleware abstractions such as multicast and *** this paper, we describe object views — language support for efficient object caching in parallel and distributed computations. Object views specify restrictions on how computation threads can use an object, providing the underlying implementation with information about the potential side effects of object access, and thereby enabling construction of scalable, low-overhead caching protocols customized to application requirements. We present extensions to the Java programming language for expressing object views, and describe the design and implementation of a translator and run-time system for executing view-augmented Java programs on a distributed cluster of workstations. Experimental results based on a shared whiteboard application demonstrate that view-based object caching can achieve performance superior to multicast- and event-based implementations, while retaining essentially a shared object interface.

关键词： object representation distributed objects object caching views collaborative applications shared objects Java

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Featherweight Java: a minimal core calculus for Java and GJ 99

Featherweight Java: a minimal core calculus for Java and GJ

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proceedings of the 14th acm sigplan conference on Object-oriented programming, systems, languages, and applications

作者： Atshushi Igarashi Benjamin Pierce Philip Wadler Dept. of Comp. & Info. Sci. University of Pennsylvania Bell Laboratories Lucent Technologies

ISBN: (纸本)9781581132380

Several recent studies have introduced lightweight versions of Java: reduced languages in which complex features like threads and reflection are dropped to enable rigorous arguments about key properties such as type safety. We carry this process a step further, omitting almost all features of the full language (including interfaces and even assignment) to obtain a small calculus, Featherweight Java, for which rigorous proofs are not only possible but *** Java bears a similar relation to full Java as the lambda-calculus does to languages such as ML and Haskell. It offers a similar computational “feel,” providing classes, methods, fields, inheritance, and dynamic typecasts, with a semantics closely following Java's. A proof of type safety for Featherweight Java thus illustrates many of the interesting features of a safety proof for the full language, while remaining pleasingly compact. The syntax, type rules, and operational semantics of Featherweight Java fit on one page, making it easier to understand the consequences of extensions and *** an illustration of its utility in this regard, we extend Featherweight Java with generic classes in the style of GJ (Bracha, Odersky, Stoutamire, and Wadler) and sketch a proof of type safety. The extended system formalizes for the first time some of the key features of GJ.

关键词： language design implementation theoretical foundations

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High Performance Computing with the Array Package for Java: A Case Study using Data Mining

High Performance Computing with the Array Package for Java: ...

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Supercomputing conference

作者： J. Moreira S. Midkiff M. Gupta R. Lawrence IBM Thomas J. Watson Research Center Yorktown Heights NY USA

This paper discusses several techniques used in developing a parallel, production quality data mining application in Java. We started by developing three sequential versions of a product recommendation data mining application: (i) a Fortran 90 version used as a performance reference, (ii) a plain Java implementation that only uses the primitive array structures from the language, and (iii) a baseline Java implementation that uses our Array package for Java. This Array package provides parallelism at the level of individual Array and BLAS operations. Using this Array package, we also developed two parallel Java versions of the data mining application: one that relies entirely on the implicit parallelism provided by the Array package, and another that is explicitly parallel at the application level. We discuss the design of the Array package, as well as the design of the data mining application. We compare the trade-offs between performance and the abstraction level the different Java versions present to the application programmer. Our studies show that, although a plain Java implementation performs poorly, the Java implementation with the Array package is quite competitive in performance with Fortran. We achieve a single processor performance of 109 Mflops, or 91% of Fortran performance, on a 332 MHz PowerPC 604e processor. Both the implicitly and explicitly parallel forms of our Java implementations also parallelize well. On an SMP with four of those PowerPC processors, the implicitly parallel form achieves 290 Mflops with no effort from the application programmer, while the explicitly parallel form achieves 340 Mflops.

关键词： High performance computing Packaging Java Computer aided software engineering Data mining Production Parallel processing programming profession Image processing Computer crime

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Load-reuse analysis: design and evaluation 99

Load-reuse analysis: design and evaluation

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proceedings of the acm sigplan 1999 conference on programming language design and implementation

作者： Rastislav Bodík Rajiv Gupta Mary Lou Soffa Dept. of Computer Science University of Pittsburgh Pittsburgh PA

ISBN: (纸本)9781581130942

Load-reuse analysis finds instructions that repeatedly access the same memory location. This location can be promoted to a register, eliminating redundant loads by reusing the results of prior memory accesses. This paper develops a load-reuse analysis and designs a method for evaluating its *** designing the analysis, we aspire for completeness---the goal of exposing all reuse that can be harvested by a subsequent program transformation. For register promotion, a suitable transformation is partial redundancy elimination (PRE). To approach the ideal goal of PRE-completeness, the load-reuse analysis is phrased as a data-flow problem on a program representation that is path-sensitive, as it detects reuse even when it originates in a different instruction along each control flow path. Furthermore, the analysis is comprehensive, as it treats scalar, array and pointer-based loads *** evaluating the analysis, we compare it with an ideal analysis. By observing the run-time stream of memory references, we collect all PRE-exploitable reuse and treat it as the ideal analysis performance. To compare the (static) load-reuse analysis with the (dynamic) ideal reuse, we use an estimator algorithm that computes, given a data-flow solution and a program profile, the dynamic amount of reuse detected by the analysis. We developed a family of estimators that differ in how well they bound the profiling error inherent in the edge profile. By bounding the error, the estimators offer a precise and practical method for determining the run-time optimization *** experiments show that about 55% of loads executed in Spec95 exhibit reuse. Of those, our analysis exposes about 80%.

关键词： register promotion program representations data-flow analysis profile-guided optimizations

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design and implementation of a certifying compiler

Design and implementation of a certifying compiler

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proceedings of the 1998 Annual acm sigplan conference on programming language design and implementation, PLDI

作者： Necula, George C. Lee, Peter Carnegie Mellon Univ Pittsburgh PA United States

The design and implementation of a compiler that translates programs written in a type-safe subset of the C programming language into highly optimized DEC Alpha assembly language programs and a certifier that automatically checks the type safety and memory safety of any assembly language program produced by the compiler is presented. The result of the certifier is either a formal proof of type safety or a counterexample pointing to a potential violation of the type system by the target program. The ensemble of the compiler and the certifier is called a certifying compiler.

关键词： Program compilers

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Generational stack collection and profile-driven pretenuring

Generational stack collection and profile-driven pretenuring

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proceedings of the 1998 Annual acm sigplan conference on programming language design and implementation, PLDI

作者： Cheng, Perry Harper, Robert Lee, Peter Carnegie Mellon Univ Pittsburgh United States

Two techniques for improving garbage collection were presented, namely, generational stack collection and profile-driven pretenuring. The first is applicable to stack based implementations of functional languages while the second is useful for any generational collector. Both techniques were implemented in a generational collector used by the TIL compiler and have observed decreases in garbage collection times of as much as 70% and 30%, respectively.

关键词： Computer systems programming

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Partial online cycle elimination in inclusion constraint graphs

Partial online cycle elimination in inclusion constraint gra...

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proceedings of the 1998 Annual acm sigplan conference on programming language design and implementation, PLDI

作者： Faehndrich, Manuel Foster, Jeffrey S. Su, Zhendong Aiken, Alexander Univ of California Berkeley Berkeley United States

Many program analyses are naturally formulated and implemented using inclusion constraints. We present new results on the scalable implementation of such analyses based on two insights: first, that online elimination of cyclic constraints yields orders-of-magnitude improvements in analysis time for large problems;second, that the choice of constraint representation affects the quality and efficiency of online cycle elimination. We present an analytical model that explains our design choices and show that the model's predictions match well with results from a substantial experiment.

关键词： Computer systems programming

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Complete removal of redundant expressions 98

Complete removal of redundant expressions

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proceedings of the 1998 Annual acm sigplan conference on programming language design and implementation, PLDI

作者： Bodik, Rastislav Gupta, Rajiv Soffa, Mary Lou Univ of Pittsburgh Pittsburgh PA United States

ISBN: (纸本)9780897919876

Partial redundancy elimination (PRE), the most important component of global optimizers, generalizes the removal of common subexpressions and loop-invariant computations. Achieving a complete PRE while incurring an acceptable code growth is the main focus of the study. An algorithm for complete removal of partial redundancies, based on the integration of code motion and control flow restructuring is presented. In contrast to existing complete techniques, resort to restructuring merely to remove obstacles to code motion, rather than to carry out the actual optimization.

关键词： Computer systems programming

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implementation of complete, asynchronous, distributed garbage collection

Implementation of complete, asynchronous, distributed garbag...

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proceedings of the 1998 Annual acm sigplan conference on programming language design and implementation, PLDI

作者： Le Fessant, Fabrice Piumarta, Ion Shapiro, Marc INRIA Roquencourt Le Chesnay France

Most existing reference-based distributed object systems include some kind of acyclic garbage collection, but fail to provide acceptable collection of cyclic garbage. Those that do provide such GC currently suffer from one or more problems: synchronous operation, the need for expensive global consensus or termination algorithms, susceptibility to communication problems, or an algorithm that does not scale. We present a simple, complete, fault-tolerant, asynchronous extension to the (acyclic) cleanup protocol of the SSP Chains system. This extension is scalable, consumes few resources, and could easily be adapted to work in other reference-based distributed object systems - rendering them usable for very large-scale applications.

关键词： Computer systems programming

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Thin locks: Featherweight synchronization for Java

Thin locks: Featherweight synchronization for Java

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proceedings of the 1998 Annual acm sigplan conference on programming language design and implementation, PLDI

作者： Bacon, David F. Konuru, Ravi Murthy, Chet Serrano, Mauricio IBM T.J. Watson Research Cent Yorktown Heights United States

language-supported synchronization is a source of serious performance problems in many Java programs. Even single-threaded applications may spend up to half their time performing useless synchronization due to the thread-safe nature of the Java libraries. We solve this performance problem with a new algorithm that allows lock and unlock operations to be performed with only a few machine instructions in the most common cases. Our locks only require a partial word per object, and were implemented without increasing object size. We present measurements from our implementation in the JDK 1.1.2 for AIX, demonstrating speedups of up to a factor of 5 in micro-benchmarks and up to a factor of 1.7 in real programs.

关键词： Java programming language

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