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An efficient meta-lock for implementing ubiquitous synchronization 99

An efficient meta-lock for implementing ubiquitous synchroni...

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

作者： Ole Agesen David Detlefs Alex Garthwaite Ross Knippel Y. S. Ramakrishna Derek White Sun Microsystems Laboratories One Network Drive Burlington MA Sun Microsystems 901 San Antonio Road Palo Alto CA

ISBN: (纸本)9781581132380

Programs written in concurrent object-oriented languages, especially ones that employ thread-safe reusable class libraries, can execute synchronization operations (lock, notify, etc.) at an amazing rate. Unless implemented with utmost care, synchronization can become a performance bottleneck. Furthermore, in languages where every object may have its own monitor, per-object space overhead must be minimized. To address these concerns, we have developed a meta-lock to mediate access to synchronization data. The meta-lock is fast (lock + unlock executes in 11 SPARC™ architecture instructions), compact (uses only two bits of space), robust under contention (no busy-waiting), and flexible (supports a variety of higher-level synchronization operations). We have validated the meta-lock with an implementation of the synchronization operations in a high-performance product-quality Java™ virtual machine and report performance data for several large programs.

关键词： concurrent threads synchronization object-oriented language implementation

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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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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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Transparent distribution of real-time components based on logical execution time 05

Transparent distribution of real-time components based on lo...

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Proceedings of the 2005 acm sigplan/SIGBED conference on languages, compilers, and tools for embedded systems

作者： Emilia Farcas Claudiu Farcas Wolfgang Pree Josef Templ University of Salzburg Austria

ISBN: (纸本)9781595930187

This paper introduces the notion of transparent distribution of real time software components. Transparent distribution means that (1) the functional and temporal behavior of a system is the same no matter where a component is executed, (2) the developer does not have to care about the differences of local versus distributed execution of components, and (3) the components can be developed independently. We present the design and implementation of a component model for real time systems that is well suited for transparent distribution. The component model is based on logical execution time, which abstracts from physical execution time and thereby from both the execution platform and the communication topology.

关键词： distribution embedded systems real-time TDL component model logical execution time MoDECS timing definition language LET transparent

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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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The design and performance of a real-time CORBA event service 97

The design and performance of a real-time CORBA event servic...

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Proceedings of the 12th acm sigplan conference on Object-oriented programming, systems, languages, and applications

作者： Timothy H. Harrison David L. Levine Douglas C. Schmidt Department of Computer Science Washington University St. Louis MO

ISBN: (纸本)9780897919081

The CORBA Event Service provides a flexible model for asynchronous communication among objects. However, the standard CORBA Event Service specification lacks important features required by real-time applications. For instance, operational flight programs for fighter aircraft have complex real-time processing requirements. This paper describes the design and performance of an object-oriented, real-time implementation of the GORBA Event Service that is designed to meet these *** paper makes three contributions to the design and performance measurement of object-oriented real-time systems. First, it illustrates how to extend the CORBA Event Service so that it is suitable for real-time systems. These extensions support periodic rate-based event processing and efficient event filtering and correlation. Second, it describes how to develop object-oriented event dispatching and scheduling mechanisms that can provide real-time guarantees. Finally, the paper presents benchmarks that demonstrate the performance tradeoffs of alternative concurrent dispatching mechanisms for real-time Event Services.

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What are Your programming language's Energy-Delay Implications?

What are Your Programming Language's Energy-Delay Implicatio...

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International Mining Software Repositories, MSR

作者： Stefanos Georgiou Maria Kechagia Panos Louridas Diomidis Spinellis Athens University of Economics and Business Delft University of Technology

Motivation: Even though many studies examine the energy efficiency of hardware and embedded systems, those that investigate the energy consumption of software applications are still limited, and mostly focused on mobile applications. As modern applications become even more complex and heterogeneous a need arises for methods that can accurately assess their energy consumption. Goal: Measure the energy consumption and run-time performance of commonly used programming tasks implemented in different programming languages and executed on a variety of platforms to help developers to choose appropriate implementation platforms. Method: Obtain measurements to calculate the Energy Delay Prod- uct, a weighted function that takes into account a task's energy consumption and run-time performance. We perform our tests by calculating the Energy Delay Product of 25 programming tasks, found in the Rosetta Code Repository, which are implemented in 14 programming languages and run on three different computer platforms, a server, a laptop, and an embedded system. Results: Compiled programming languages are outperforming the interpreted ones for most, but not for all tasks. C, C#, and JavaScript are on average the best performing compiled, semi-compiled, and interpreted programming languages for the Energy Delay Product, and Rust appears to be well-placed for i/o-intensive operations, such as file handling. We also find that a good behaviour, energy- wise, can be the result of clever optimizations and design choices in seemingly unexpected programming languages.

关键词： Task analysis Computer languages programming Software Servers Energy consumption Portable computers

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Structured programming: From theory to practice 76

Structured Programming: From theory to practice

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Proceedings of the 2nd international conference on Software engineering

作者： John C. Carrow

One of the more controversial topics to appear within the field of Computer Science has been the theory of Structured programming and the specific tools and techniques associated with this generic title. With respect to this topic, it is the intent of this paper to provide a documented history of the research, prototyping and deliberate implementation of the Structured programming Technology within the United States Army Computer Systems Command. Structured programming as used within the context of this paper involves the concepts of structured code, top down development, walkthrus, program design language, design and documentation tools, program support library and a programming team. The USACSC experience is viewed as not just another case study but rather an organizational change impacting a large number (500 COBOL programmers) of personnel, standards, and normal operating *** of the more intriguing topics to appear within the field of Computer Science has been the theory of Structured programming and the specific tools and techniques associated with this generic title. After several years of discussion, pilot projects, technical articles and more discussions, the basic questions remain: What does the technology buy you? What does it cost you? How does one implement the technology on a large scale in a software production shop?With respect to these questions, and many others that the Software community shares regarding Structured programming, it is the intent of this paper to provide a documented history of the research, prototyping and deliberate implementation of the Structured programming Technology within the United States Army Computer Systems Command (USACSC).

关键词： Functional decomposition

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Thinking in imperative or objects? A study on how novice programmer thinks when it comes to designing an application

Thinking in imperative or objects? A study on how novice pro...

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IEEE International conference on Teaching, Assessment and Learning for Engineering (TALE)

作者： Sim Tze Ying School of Interdisciplinary Studies Sunway University Subang Jaya Malaysia

ISBN: (数字)9781728126654

ISBN: (纸本)9781728126661

Novice programming is a challenging subject to teach and learn. However, programming is an essential skill that is required by many majors apart from Computer Science. The challenges in a novice programming subject change according to the programming language used. At the beginning of the 90s, the object-oriented programming was introduced. Detienne claimed that it is easier for programmers to program using the object-first approach as humans think naturally in objects. The IEEE and acm joint task force on Computing Curriculum proposed two tracks of curriculum, one for imperative-first and the other for object-first implementation. However, most of the work conducted on novice programming focused on the issues of syntax errors, reducing the possibilities of syntax error through a new or adapted programming environment. This paper will present the preliminary work to investigate if students will naturally think in objects or a series of steps. Three intervention methods were implemented in three different workshops. The intervention methods are the object-first, the imperative-first and the problem-solving-first. The students are then requested to design an application. Through the design, the research will identify if the students use the object-first or the imperative-first design. Assuming that the object-first intervention group will design primarily in objects, and the imperative-first intervention group in a series of steps, the problem-solving intervention will be the “neutral” group. The object-first design is reflected through the attributes and methods of a particular object. The imperative-first design is identified if the solution contains a series of steps. The findings show that most of the students designed the application using a series of steps reflecting the imperative-first design. This finding should be included when considering if imperative-first or object-first should be the way forward for a novice programming subject.

关键词： Syntactics programming profession conferences Computer languages Object oriented programming Tools

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Use object-oriented paradigm to design and implement an algorithm for object-oriented class-level testing

Use object-oriented paradigm to design and implement an algo...

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IEEE International conference on Systems, Man and Cybernetics

作者： Yu Xia Sun Huo Yan Chen Department of Computer Science Jinan University Guangzhou China

ISBN: (纸本)0780379527

One of the means to enhance software reliability and quality is testing. The testing for object-oriented software is more complex and difficult than that for traditional programming. For object-oriented class-level and cluster-level testing, we proposed a significant methodology TACLLE which has been published in acm Transactions on Software Engineering and Methodology (vol.7., no.3, p.250-95, 1998; vol.10, no.1, p.56-109, 2001). This methodology includes an important algorithm named DOE to determine whether two objects are observational equivalent or not. This paper presents the design and implementation for a new prototype of DOE using object-oriented paradigm. The new prototype is based on UML model. It is improved on the technique, and optimized in the system interface.

关键词： Algorithm design and analysis Software testing Clustering algorithms US Department of Energy Software prototyping Prototypes Software reliability Object oriented programming Software engineering Unified modeling language

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