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检索条件"任意字段=Proceedings of the ACM SIGPLAN 1997 conference on Programming language design and implementation"

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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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Precise specification and automatic application of design patterns

Precise specification and automatic application of design pa...

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IEEE International conference on Automated Software Engineering (ASE)

作者： A.H. Eden A. Yehudai J. Gil Department of Computer Science School of Mathematics Tel-Aviv University Tel-Aviv Israel Faculty of Computer Science Technion-Israel Institute of Technology Haifa Israel

Despite vast interest in design patterns, the specification and application of patterns is generally assumed to rely on manual implementation. We describe a precise method of specifying how a design pattern is applied: by phrasing it as an algorithm in a meta-programming language. We present a prototype of a tool that supports the specification of design patterns and their realization in a given program. Our prototype allows automatic application of design patterns without obstructing the source code test from the programmer, who may edit it at will. We demonstrate pattern specification in meta-programming techniques and a sample outcome of its application.

关键词： Collaboration Application software Computer science Prototypes programming profession Mathematics Gas insulated transmission lines Manuals Algorithm design and analysis Process design

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Precise specification and automatic application of design patterns 97

Precise specification and automatic application of design pa...

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proceedings of the 12th international conference on Automated software engineering (formerly: KBSE)

作者： A. H. Eden A. Yehudai J. Gil

ISBN: (纸本)9780818679612

关键词： source code editing meta-programming language algorithm source code test precise pattern specification object-oriented methods object-oriented design automatic pattern application software tool prototype design patterns

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On the evaluation of a problem solving and program development environment

On the evaluation of a problem solving and program developme...

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Frontiers in Education (FIE) conference

作者： F.P. Deek J.A. McHugh S.R. Hiltz N. Rotter H. Kimmel Department of Computer and Information Science New Jersey Institute of Technology University Heights Newark NJ USA New Jersey Institute of Technology Newark NJ US

When learning problem solving and program development, understanding programming (i.e. the syntax of a programming language) and implementation is only part of the picture. Developing the cognitive skills to comprehend and abstract the problem and its requirements, explore and transform the problem into a coherent form, design, develop and test the solution to the problem is the other part. To expect effective and efficient solutions to be produced, a considerable amount of important and creative work must be done before the program can be written. Students learning programming, using current tools, are accustomed to the entry point in any programming language environment being through the compiler's editor. As a result, when presented with a problem, students tend to reach for the keyboard and start the coding. This creates the impression that the formulation of the solution to the problem starts by writing the code, a habit that must be altered.

关键词： Problem-solving Computer languages Springs Information science Testing Program processors Keyboards Writing Prototypes programming environments

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An effective garbage collection strategy for parallel programming languages on large scale distributed-memory machines 97

An effective garbage collection strategy for parallel progra...

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proceedings of the sixth acm sigplan symposium on Principles and practice of parallel programming

作者： Kenjiro Taura Akinori Yonezawa Department of Information Science Faculty of Science University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113 Japan

ISBN: (纸本)9780897919067

This paper describes the design and implementation of a garbage collection scheme on large-scale distributed-memory computers and reports various experimental results. The collector is based on the conservative GC library by Boehm & Weiser. Each processor traces local pointers using the GC library while traversing remote pointers by exchanging "mark messages" between processors. It exhibits a promising performance---in the most space-intensive settings we tested, the total collection overhead ranges from 5% up to 15% of the application running time (excluding idle time). We not only examine basic performance figures such as the total overhead or latency of a global collection, but also demonstrate how local collection scheduling strategies affect application performance. In our collector, a local collection is scheduled either independently or synchronously. Experimental results show that the benefit of independent local collections has been overstated in the literature. Independent local collections slowed down application performance to 40%, by increasing the average communication latency. Synchronized local collections exhibit much more robust performance characteristics than independent local collections and the overhead for global synchronization is not significant. Furthermore, we show that an adaptive collection scheduler can select the appropriate local collection strategy based on the application's behavior. The collector has been used in a concurrent object-oriented language ABCL/f and the performance is measured on a large-scale parallel computer (256 processors) using four non-trivial applications written in ABCL/f.

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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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design and implementation of a bridge between CORBA and DCE

Design and implementation of a bridge between CORBA and DCE

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conference on Local Computer Networks (LCN)

作者： Dong-Jin Kim Han Namgoong Young-Chul Lew Distributed Processing Section Electronics and Telecommunications Research Institute Taejon South Korea

ISBN: (纸本)0818681411

This paper considers a bridge which can be used for the communication between the Common Object Request Broker Architecture (CORBA) and the Distributed Computing Environment (DCE). A bridge can overcome the heterogeneity of different distributed middleware platforms. The key point in creating bridges is the design and implementation of the mapping function and interface definition language (IDL) translation, enabling communication between them. The main work addressed in this paper involves the design and implementation of a couple of technologies: the IDL translation tool which translates an existing DCE interface definition into an equivalent CORBA interface definition; and a bridge code generation tool which automatically generates a CORBA-to-DCE bridge, based on a DCE interface definition.

关键词： Bridges Distributed computing programming environments Application software Communication system security Distributed processing Uniform resource locators Middleware Environmental management Skeleton

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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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The impact on student performance of a change of language in successive introductory computer programming subjects 00

The impact on student performance of a change of language in...

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proceedings of the Australasian conference on Computing education

作者： Wendy Doube Monash University Gippsland Campus Switchback Road Churchill VIC 3843 Australia

ISBN: (纸本)9781581132717

In 1998, in two consecutive introductory computer programming subjects, the implementation language changed from C++ to Java, in semester 1 for the first subject and semester 2 for the second subject 70% of students in the second subject had no previous exposure to Java mainly because of exemptions and part-time study mode course structure. Performance of the two groups was compared with final results from the years 1992 to 1997. No significant difference was found in the students who took Java at the first level. Although only slightly poorer, the reduced performance of the other group suggested that additional measures were required to assist their transition. Acquisition of object-oriented concepts and design approaches appeared to be the major source of difficulty. A number of compensatory measures were recommended including use of a language independent object-oriented design text and additional Java programming worked exercise.

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A generational on-the-fly garbage collector for Java 00

A generational on-the-fly garbage collector for Java

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proceedings of the acm sigplan 2000 conference on programming language design and implementation

作者： Tamar Domani Elliot K. Kolodner Erez Petrank IBM Haifa Research Lab. Computer Science Dept. Technion - Israel Institute of Technology

ISBN: (纸本)9781581131994

An on-the-fly garbage collector does not stop the program threads to perform the collection. Instead, the collector executes in a separate thread (or process) in parallel to the program. On-the-fly collectors are useful for multi-threaded applications running on multiprocessor servers, where it is important to fully utilize all processors and provide even response time, especially for systems for which stopping the threads is a costly operation. In this work, we report on the incorporation of generations into an on-the-fly garbage collector. The incorporation is non-trivial since an on-the-fly collector avoids explicit synchronization with the program threads. To the best of our knowledge, such an incorporation has not been tried before. We have implemented the collector for a prototype Java Virtual Machine on AIX, and measured its performance on a 4-way *** for other generational collectors, an on-the-fly generationalcollector has the potential for reducing the overall running time and working set of an application by concentrating collection efforts on the young objects. However, in contrast to other generational collectors,on-the-fly collectors do not move the objects; thus, there is no segregation between the old and the young objects. Furthermore, on-the-fly collectors do not stop the threads, so there is no extra benefit for the short pauses obtained by generational collection. Nevertheless, comparing our on-the-fly collector with and without generations, it turns out that the generational collector performs better for most applications. The best reduction in overall running time for the benchmarks we measured was 25%. However, there were some benchmarks for which it had no effect and one for which the overall running time increased by 4%.

关键词： memory management generational garbage collection programming languages garbage collection

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