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检索条件"任意字段=Proceedings of the ACM SIGPLAN 1991 conference on Programming language design and implementation"

共 1210 条记录，以下是1181-1190 订阅

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A compiler approach to fast hardware design space exploration in FPGA-based systems 02

A compiler approach to fast hardware design space exploratio...

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proceedings of the acm sigplan 2002 conference on programming language design and implementation

作者： Byoungro So Mary W. Hall Pedro C. Diniz University of Southern California Marina del Rey California

ISBN: (纸本)9781581134636

The current practice of mapping computations to custom hardware implementations requires programmers to assume the role of hardware designers. In tuning the performance of their hardware implementation, designers manually apply loop transformations such as loop unrolling. designers manually apply loop transformations. For example, loop unrolling is used to expose instruction-level parallelism at the expense of more hardware resources for concurrent operator evaluation. Because unrolling also increases the amount of data a computation requires, too much unrolling can lead to a memory bound implementation where resources are idle. To negotiate inherent hardware space-time trade-offs, designers must engage in an iterative refinement cycle, at each step manually applying transformations and evaluating their impact. This process is not only error-prone and tedious but also prohibitively expensive given the large search spaces and with long synthesis times. This paper describes an automated approach to hardware design space exploration, through a collaboration between parallelizing compiler technology and high-level synthesis tools. We present a compiler algorithm that automatically explores the large design spaces resulting from the application of several program transformations commonly used in application-specific hardware designs. Our approach uses synthesis estimation techniques to quantitatively evaluate alternate designs for a loop nest computation. We have implemented this design space exploration algorithm in the context of a compilation and synthesis system called DEFACTO, and present results of this implementation on five multimedia kernels. Our algorithm derives an implementation that closely matches the performance of the fastest design in the design space, and among implementations with comparable performance, selects the smallest design. We search on average only 0.3% of the design space. This technology thus significantly raises the level of abstraction fo

关键词： design space exploration data dependence analysis reuse analysis loop transformations

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Communication Optimizations for Parallel Computing Using Data Access Information

Communication Optimizations for Parallel Computing Using Dat...

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Supercomputing conference

作者： M.C. Rinard Department of Computer Science University of California슠Santa Barbara Santa Barbara CA USA

Given the large communication overheads characteristic of modern parallel machines, optimizations that eliminate, hide or parallelize communication may improve the performance of parallel computations. This paper describes our experience automatically applying communication optimizations in the context of Jade, a portable, implicitly parallel programming language designed for exploiting task-level concurrency. Jade programmers start with a program written in a standard serial, imperative language, then use Jade constructs to declare how parts of the program access data. The Jade implementation uses this data access information to automatically extract the concurrency and apply communication optimizations. Jade implementations exist for both shared memory and message passing machines; each Jade implementation applies communication optimizations appropriate for the machine on which it runs. We present performance results for several Jade applications running on both a shared memory machine (the Stanford DASH machine) and a message passing machine (the Intel iPSC/860). We use these results to characterize the overall performance impact of the communication optimizations. For our application set replicating data for concurrent read access and improving the locality of the computation by placing tasks close to the data that they access are the most important optimizations. Broadcasting widely accessed data has a significant performance impact on one application; other optimizations such as concurrently fetching remote data and overlapping computation with communication have no effect.

关键词： Parallel processing Concurrent computing Message passing Parallel machines design optimization Context Parallel programming programming profession Data mining Broadcasting

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Halide: a language and compiler for optimizing parallelism, locality, and recomputation in image processing pipelines 13

Halide: a language and compiler for optimizing parallelism, ...

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proceedings of the 34th acm sigplan conference on programming language design and implementation

作者： Jonathan Ragan-Kelley Connelly Barnes Andrew Adams Sylvain Paris Frédo Durand Saman Amarasinghe Massachusetts Institute of Technology Cambridge MA USA Adobe Cambridge MA USA

ISBN: (纸本)9781450320146

Image processing pipelines combine the challenges of stencil computations and stream programs. They are composed of large graphs of different stencil stages, as well as complex reductions, and stages with global or data-dependent access patterns. Because of their complex structure, the performance difference between a naive implementation of a pipeline and an optimized one is often an order of magnitude. Efficient implementations require optimization of both parallelism and locality, but due to the nature of stencils, there is a fundamental tension between parallelism, locality, and introducing redundant recomputation of shared *** present a systematic model of the tradeoff space fundamental to stencil pipelines, a schedule representation which describes concrete points in this space for each stage in an image processing pipeline, and an optimizing compiler for the Halide image processing language that synthesizes high performance implementations from a Halide algorithm and a schedule. Combining this compiler with stochastic search over the space of schedules enables terse, composable programs to achieve state-of-the-art performance on a wide range of real image processing pipelines, and across different hardware architectures, including multicores with SIMD, and heterogeneous CPU+GPU execution. From simple Halide programs written in a few hours, we demonstrate performance up to 5x faster than hand-tuned C, intrinsics, and CUDA implementations optimized by experts over weeks or months, for image processing applications beyond the reach of past automatic compilers.

关键词： autotuning parallelism locality compiler vectorization gpu redundant computation optimization domain specific language image processing

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The development of a large scale mathematical programming system 68

The development of a large scale mathematical programming sy...

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proceedings of the 1968 23rd acm national conference

作者： Jacques De Buchet

ISBN: (纸本)9781450374866

The general purpose mathematical programming systems have greatly changed in the last few years and the aim of such codes is no longer to give access to an efficient algorithm but to integrate the solution of linear programming problems into a loop including the generation of the problem, its solution, its post optimal analysis and the edition of an output report of the results. The link between all these operations is done through a so-called control language *** these aspects are more or less the same from one code to another but we think that new approaches should be brought into their design, organization, and implementation. The development cost of such programs being very high, usually in the order of 15 to 30 man years, it is necessary to provide facilities in order to:- offer suitable users and programming languages;- have a modular design;- handle memory allocation in a semi-optimal way;- make modifications and extensions easier; and- facilitate day to day programmers tasks.I shall present, in the following pages, the objectives that we had in mind when we began to implement these facilities within the large scale mathematical programming system OPHELIE 2 which we developed for the CDC 6600.

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Dynamic spatial query language: a customized query language for object-oriented database systems

Dynamic spatial query language: a customized query language ...

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IEEE Annual International Computer Software and Applications conference (COMPSAC)

作者： W.S. Luk A. Choi School of Computing Science Simon Fraser University Burnaby BC Canada

A design is presented of a customized query language for manipulating geometric objects in a three-dimensional space, called dynamic spatial query language (DSQL), with which an end user retrieves, updates, and deletes spatial and nonspatial information about the objects without any knowledge of their exact spatial locations. DSQL, as an application-oriented query language, is built on top of an object-oriented database system, and operates on a database view that captures spatial characteristics of the objects and relationships among the objects. The authors also describe a bilevel data modeling approach as a methodology for design and implementation application-oriented query languages.< >

关键词： Database languages Database systems Object oriented databases Data models Application software Spatial databases Object oriented modeling design methodology Object oriented programming Information retrieval

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An exercise in verifying concurrent programs in industry: the I/O subsystem

An exercise in verifying concurrent programs in industry: th...

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International Phoenix conference on Computers and Communications (IPCCC)

作者： M.G. Staskauskas Department of Computer Sciences University of Texas Austin Austin TX USA

The author describes the formal verification of a portion of an existing mainframe operating system using the UNITY methodology proposed by K.M. Chandy and J. Misra (1988). The UNITY methodology consists of a programming notation and a logic for specifying and reasoning about properties of parallel programs. The author discusses the steps involved in specifying the operating system, deriving from the specification a correct UNITY program, and using the latter to drive the assembly language implementation of the system. He also comments on his experience in applying a formal methodology in the context of a large software project.< >

关键词： Computer industry Resource management Operating systems Logic programming Formal verification Drives Assembly systems Application software Software quality Software design

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A distributed object-oriented environment for EMS application development

A distributed object-oriented environment for EMS applicatio...

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Annual Hawaii International conference on System Sciences (HICSS)

作者： M.O. Pendergast Decision and Information Sciences Dept University of Florida Gainesville FL USA

Describes an architecture for implementing Electronic Meeting Systems (EMS) applications in an Object-Oriented programming Environment. The environment is based on the C++ programming language and personal computers communicating over a local area network. An overview of C++ class concepts and terminology is included to familiarize the reader with terminology peculiar to C++ and necessary for the implementation of the design. The Object-Oriented EMS architecture is a three tier structure having layers for base classes, tools, and applications. The OO-EMS design addresses concurrency control, object addressing, duplicated objects, and broadcast communications.< >

关键词： Medical services Application software Computer architecture Terminology Object oriented programming Computer languages Microcomputers Local area networks Concurrency control Broadcasting

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Exact: a model-based knowledge acquisition tool for selection tasks

Exact: a model-based knowledge acquisition tool for selectio...

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proceedings of the IEEE/acm International conference on Developing and Managing Expert System Programs

作者： M.E. van Steenbergen PTT Research Leidschendam Netherlands

A discussion is presented of EXACT (expert system acquisition tool), a model-based knowledge acquisition tool. EXACT supports knowledge engineers in structuring and maintaining the domain knowledge needed to execute a particular selection task. The following principles have guided the development of EXACT: knowledge acquisition tools are useful for knowledge engineers rather than domain experts; the dialogue between such a tool and the user should be one of mixed initiative; the output of the tool should be an implementation-independent knowledge document; it should be easy to add more functionality to the tool gradually. In order to be able to develop EXACT, a model of the selection task has been made. EXACT has been implemented in the object-oriented language Smalltalk/V.< >

关键词： Knowledge acquisition Object oriented modeling Knowledge engineering Expert systems Maintenance engineering design engineering Prototypes

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Finding application errors and security flaws using PQL: a program query language 05

Finding application errors and security flaws using PQL: a p...

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proceedings of the 20th annual acm sigplan conference on Object-oriented programming, systems, languages, and applications

作者： Michael Martin Benjamin Livshits Monica S. Lam Stanford University

ISBN: (纸本)9781595930316

A number of effective error detection tools have been built in recent years to check if a program conforms to certain design rules. An important class of design rules deals with sequences of events asso-ciated with a set of related objects. This paper presents a language called PQL (Program Query language) that allows programmers to express such questions easily in an application-specific context. A query looks like a code excerpt corresponding to the shortest amount of code that would violate a design rule. Details of the tar-get application's precise implementation are abstracted away. The programmer may also specify actions to perform when a match is found, such as recording relevant information or even correcting an erroneous execution on the *** have developed both static and dynamic techniques to find solutions to PQL queries. Our static analyzer finds all potential matches conservatively using a context-sensitive, flow-insensitive, inclusion-based pointer alias analysis. Static results are also use-ful in reducing the number of instrumentation points for dynamic analysis. Our dynamic analyzer instruments the source program to catch all violations precisely as the program runs and to optionally perform user-specified *** have implemented the techniques described in this paper and found 206 errors in 6 large real-world open-source Java applica-tions containing a total of nearly 60,000 classes. These errors are important security flaws, resource leaks, and violations of consis-tency invariants. The combination of static and dynamic analysis proves effective at addressing a wide range of debugging and pro-gram comprehension queries. We have found that dynamic analysis is especially suitable for preventing errors such as security vulner-abilities at runtime.

关键词： bug finding resource leaks pattern matching SQL injection web applications program traces

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A comparison of two object-oriented design methodologies (abstract only) 87

A comparison of two object-oriented design methodologies (ab...

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proceedings of the 15th annual conference on Computer Science

作者： Linda Rising Department of Computer Technology Indiana University-Purdue University at Fort Wayne Fort Wayne Indiana

ISBN: (纸本)9780897912181

With the increasing use of Ada* in light of DoD Directive 5000.31, “The Ada programming language shall become the single, common, computer programming language for Defense mission-critical applications.” there has been an accompanying increase in interest in the proper software engineering techniques to insure that the powerful capabilities of Ada will be used to their *** one Ada development site, the design and implementation approach used has been that proposed by Grady Booch, Object-Oriented design (OOD):identify the objects of interest in the problem space and their attributesidentify the operations suffered by and required of each objectestablish the visibility of each object in relation to other objectsestablish the interface of each objectA proposal has been made to compare the deliverables and the end results of the above method with that of David Parnas, the Software Cost Reduction Method (SCR):identify a list of design decisions for which change cannot be ruled out (data structures, algorithms, etc.) make each design decision the “secret” of one module which comprises sub-programs that cannot be coded without knowledge of the “secret”design module interfaces that are insensitive to anticipated changes*Ada is a registered trademark of the U.S. Department of Defense (Ada Joint Program Office)

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