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User accessible reply capabilities in invoking and servicing operations

CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2015年第17期27卷 5134-5155页

作者： Olsson, Ronald A. Keen, Aaron W. Univ Calif Davis Dept Comp Sci Davis CA 95616 USA Calif Polytech State Univ San Luis Obispo Dept Comp Sci San Luis Obispo CA 93407 USA

Many message passing languages and packages include some form of synchronous invocation. In a synchronous invocation, the invoker waits for the invocation's servicer to pass back results. A synchronous invocation can be viewed as a pair of asynchronous invocations: one-initiating the computation-with parameter values from the invoker to the servicer and the other-once the requested computation has completed-with the 'go-ahead' and return value from the servicer to the invoker. The target of the latter invocation is known as the reply operation, and a reference to it is known as a reply capability. This paper addresses the issues of making such reply capabilities directly accessible to user code. It presents the design and prototype implementation of a new version of the jr concurrent programming language, called xjr, in which the reply capability can be explicit. This paper gives xjr examples, including realistic ones, to highlight the additional flexibility the new features offer (such as a non-lexical reply). These additional features do not impact the run-time performance of existing jr features and can even lead to more efficient code in some programming scenarios. Our experience with the prototype implementation indicates that an actual implementation would be fruitful and would preserve the prototype's performance advantages. Copyright (c) 2015John Wiley & Sons, Ltd.

关键词： concurrent programming message passing early reply deferred reply forward reply capabilities transformations jr programming language

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RJ: a Java package providing jr-like concurrent programming

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SOFTWARE-PRACTICE & EXPERIENCE 2016年第5期46卷 685-708页

作者： Olsson, Ronald A. Williamson, Todd Univ Calif Davis Dept Comp Sci One Shields Ave Davis CA 95616 USA

The jr concurrent programming language extends Java with a richer concurrency model, by adding several new types and statements. jr provides dynamic remote virtual machine creation, dynamic remote object creation, remote method invocation, dynamic process creation, rendezvous, asynchronous message passing, semaphores, concurrent invocation, and shared variables. This paper presents RJ, a package for Java that provides jr-like features. The paper gives an overview of RJ and its key features;describes the implications of RJ's design, including how RJ provides additional, useful flexibility;discusses the implementation of RJ;and gives qualitative and quantitative evaluations of our work with respect to feasibility and usability, experimentation, migration, and performance. RJ has been successful in meeting these goals and in providing insight into the trade-offs between using a concurrent programming language versus using the equivalent concurrent package. Our work has yielded a few surprises in dealing with some concurrent programming language features, in understanding the run-time performances of jr versus RJ programs, and in obtaining some additional, useful flexibility for concurrent programming applications. Copyright (c) 2015 John Wiley & Sons, Ltd.

关键词： concurrency concurrent programming languages concurrent programming packages package design package implementation jr programming language

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A NOTE ON CORRECTLY GATHERING RESULTS FROM jr'S CONCURRENT INVOCATION STATEMENT

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SCALABLE COMPUTING-PRACTICE AND EXPERIENCE 2017年第3期18卷 253-260页

作者： Olsson, Ronald A. Univ Calif Davis Dept Comp Sci One Shields Ave Davis CA 95616 USA

jr's concurrent invocation statement (CoStmt, for short) provides a form of collective communication. The thread executing a CoStmt can gather results from each of many invocations. This paper presents a problem that arises in using Java List structures in gathering such results. It presents incorrect and correct attempts at solutions and discusses the tradeoffs, including performance, among the correct solutions.

关键词： Concurrency concurrent programming jr programming language concurrent invocation synchronisation

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Reducing distributed jr program start-up time via extending jr's operation abstraction

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CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2018年第14期30卷

作者： Olsson, Ronald A. Keen, Aaron W. Williamson, Todd Univ Calif Davis Dept Comp Sci Davis CA 95616 USA Calif Polytech State Univ San Luis Obispo Comp Sci & Software Engn Dept San Luis Obispo CA 93407 USA

This paper shows how to simplify and speed up distributed jr program start-up. We accomplish this goal by extending jr's operation abstraction so that it includes the creation of virtual machines and remote objects, the key components in distributed jr programs. This extension is conceptually simple, fits well with the rest of the jr language, and provides additional flexibility. Extending jr's operation abstraction yields a considerably less complex solution and a simpler implementation than other approaches, which would have led to redundant or ad-hoc language mechanisms. The extension also allows for reduced distributed jr program start-up costs because the creation of virtual machines and remote objects can now be done in parallel. This paper also describes how we have simulated this extension and have implemented a prototype that provides this extension. These reflect closely what we would need to do to actually include the extension within the standard jr implementation. Using the simulation and prototype, we obtained performance data on a few typical distributed applications written to use the extension. The data show large reductions, ranging from about 50% to 95%, in distributed jr program start-up times. Our experiments also explored a few strategies to further reduce start-up times, but, among our strategies, the straightforward strategies seem the best. This paper also discusses design alternatives for creating virtual machines and remote objects. Our experience suggests that the proposed extension to jr's operation abstraction is actually worthwhile to add to the standard jr language and implementation.

关键词： collective communication concurrency distributed programming jr programming language program start-up virtual machine creation

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Transformations for early reply and forward message passing mechanisms

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CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2015年第17期27卷 4645-4658页

作者： Olsson, Ronald A. Keen, Aaron W. Williamson, Todd Univ Calif Davis Dept Comp Sci Davis CA 95616 USA Calif Polytech State Univ San Luis Obispo Dept Comp Sci San Luis Obispo CA 93407 USA

Message passing notations (language, package, etc.) typically include some form of asynchronous or synchronous invocation. In a synchronous invocation, the invoker waits for the invocation's servicer to pass back results. Some message passing notations also include early reply or deferred reply (including forwarding), which alters how and when the servicer passes back its results;this additional flexibility is useful in realistic applications. It is well known how to transform a synchronous invocation into only asynchronous invocations. This paper extends such transformations to early reply and forward. This paper also describes the use of these transformations within the implementations of programming notations. Using the transformation simplifies the implementation without significantly affecting run-time costs. Copyright (c) 2015 John Wiley & Sons, Ltd.

关键词： concurrency message passing early reply deferred reply forward transformations jr programming language

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