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9th ieee international symposium on object and Component-oriented real-time distributed computing

作者： Im, Chansik Kim, K. H. (Kane) Intel Corp Hillsboro OR 97124 USA Univ Calif Irvine Irvine CA 92717 USA

ISBN: (纸本)076952561X

Guaranteeing response times of real-time (RT) distributed computing systems has been recognized as one of the biggest challenges by the RT software research community for three decades. the concept of a hybrid approach that combines analytical derivation approaches and testing-based statistical derivation approaches in a symbiotic form for meeting this challenge was presented in recent years. However, concrete practical hybrid approaches are still in early stages of development. One such approach pursued by the authors and their collaborators is presented here. this paper focuses on the cases of deriving tight execution time bounds of the segments of object methods which do not involve calls for services from the operating system kernel and middleware. A case-study that demonstrates how the adopted approach works in handling a simple practical application is also presented.

关键词： real time hybrid worst-case execution time worst-case execution path program-segment method-segment acyclic path-segment path enumeration curve-fitting execution time bound TETB analysis measurement

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OASIS: An architecture for dynamic instrumentation of enterprise distributed real-time and embedded systems

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COMPUTER SYSTEMS SCIENCE AND ENGINEERING 2011年第6期26卷 413-423页

作者： Hill, James Sutherlandy, Hunt Staudingery, Paul Silveriaz, thomas Schmidtx, Douglas C. Slabyz, John Visnevskiy, Nikita Indiana Univ Purdue Univ Indianapolis IN 46202 USA GE Global Res Niskayuna Niskayuna NY USA Vanderbilt Univ Nashville Nashville TN USA

Instrumentation is a critical part of evaluating an enterprise distributed real-time and embedded (DRE) system's performance. Traditional techniques for instrumenting enterprise DRE systems require DRE system developers to make design decisions regarding what metrics to collect during early phases of the software lifecycle so these needs can be factored into the system architecture. In many circumstances, however, it is hard for DRE system developers to know this information during early phases of the software lifecycle-especially when metrics come from many heterogeneous sources (such as application-and system-level hardware and software resources) and evaluating performance is traditionally an after-thought. To address these issues, this article presents the design and performance of OASIS, which is SOA-based middleware and tools that dynamically instruments enterprise DRE system without requiring design-time knowledge of which metrics to collect. this article also empirically evaluates OASIS in the context of a representative enterprise DRE system case study from the domain of shipboard computing. Results from applying OASIS to this case study show that its flexibility enables DRE system testers to precisely control instrumentation overhead. We also highlight open challenges in dynamic instrumentation for next-generation enterprise DRE systems.

关键词： dynamic instrumentation enterprise DRE systems service-oriented architecture middleware real-time instrumentation

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Automatic performance visualization of distributed real-time systems

Automatic performance visualization of distributed real-time...

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9th ieee international symposium on object and Component-oriented real-time distributed computing

作者： Harmon, Trevor Klefstad, Raymond Univ Calif Irvine Henri Samueli Sch Engn Dept Elect Engn & Comp Sci 608 Engn Tower Irvine CA 92697 USA

ISBN: (纸本)076952561X

For distributed real-time systems, adequate profiling tools are exceedingly rare. the sheer variety and low-level nature of these systems impede the adoption of standard, general-purpose tools for performance analysis and visualization. Although much research has been devoted to profiling parallel clusters and supercomputers, the literature virtually ignores the real-time domain. Correspondingly, a handful of commercial tools is available for profiling realtime software, but they invariably make a single-node assumption and are unable to cope with distributed environments. We examine the state of performance analysis and discuss why profilers are conspicuously absent in the field of distributed real-time systems. We then explore how developers of these systems could benefit from graphical profiling tools with automatic instrumentation and data collection. Toward that end, we demonstrate the prototype of a performance visualization tool called "Bacara," the second addition to our suite of tools for Visual Analysis of distributed real-time systems, or VADR (va'dar).

关键词： distributed computer systems

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Developing simulation models of open distributed control system by using object-oriented structual and behavioral patterns 4

Developing simulation models of open distributed control sys...

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4th ieee international symposium on object-oriented real-time computing (ISORC 2001)

作者： Tomura, T Uehiro, K Kanai, S Yamamoto, S Asahikawa Natl Coll Technol Asahikawa Hokkaido Japan

ISBN: (纸本)0769510892

An open distributed control system (DCS), which consists of many devices and an open network interconnecting them, is now used in many automation areas. For assuring the control performance under the heavy traffic on the network, the simulation of a DCS is strongly needed. For this purpose, we propose an object-oriented design pattern approach as a uniform, efficient and accurate method of modeling and simulating a DCS. Four design patterns are newly proposed. Device-Constructor and Composite-Device-Constructor patterns describe classes and mechanisms for uniformly structuring device models composed of many kinds of sensors and actuators. Statechart pattern defines classes and the state-transition execution mechanism for realizing the behavior of sensors and actuators in a device. While Event-Chain pattern defines classes and the event dispatching mechanism among sensors and actuators intra-device and inter-device. the systematic implementation procedures from these patterns to the executable Java code of the DCS simulation model are also discussed. Finally, the effectiveness of our approach was proved by developing the Java-based DCS modeler and simulator used in building automation area.

关键词： distributed parameter control systems

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A lightweight middleware protocol for ad hoc distributed object computing in ubiquitous computing environments 6

A lightweight middleware protocol for ad hoc distributed obj...

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6th ieee international symposium on object-oriented real-time distributed computing

作者： Yau, SS Karim, F Arizona State Univ Dept Comp Sci & Engn Tempe AZ 85287 USA

ISBN: (纸本)0769519288

Devices in ubiquitous computing environments are usually embedded, wearable, and handheld, have resource constraints, and are all connected to each other through wireless connections and other computers possibly through fixed network infrastructures, such as the Internet. these devices may form numerous webs of short-range and often low-power mobile ad hoc networks to exchange information. distributed object computing (DOC) middleware technologies have been successful in promoting high quality and reusable distributed software for enterprise-oriented environments. In order to reap the same benefit in ubiquitous computing environments, it is important to note that the natural interactions among distributed objects in ubiquitous computing environments are quite different due to various factors, such as bandwidth constraints, unpredictable device mobility, network topology change, and context-sensitivity (or situation-awareness) of application objects. Hence, the interactions among distributed objects tend to be more spontaneous and short-lived rather than predictable and long-term. In this paper, a middleware protocol, RKF, to facilitate distributed object-based application software to interact in an ad hoc fashion in ubiquitous computing environments is presented. RKF addresses both spontaneous object discovery and context-sensitive object data exchange. Our experimental results, based on RKF's implementation and evaluation inside the object request broker of our RCSM middleware test bed, indicate that it is lightweight, has good performance, and can be easily used in PDA-like devices.

关键词： ubiquitous computing environments lightweight middleware protocol distributed object computing middleware context-sensitivity situation-awareness mobile ad hoc networks Reconfigurable Context-Sensitive Middleware context-sensitive communications

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A Document centric Framework for Building distributed Smart object Systems

A Document centric Framework for Building Distributed Smart ...

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ieee international symposium on object/Component/Service-oriented real-time distributed computing

作者： Kawsar, Fahim Nakajima, Tatsuo Waseda Univ Dept Comp Sci Tokyo Japan

ISBN: (纸本)9780769535739

We present an architectural framework that provides the foundation for building smart object systems and uses a document centric approach utilizing a profile based artefact framework and a task based application framework. Our artefact framework represents an instrumented physical smart objects as a collection of service profiles and expresses these services in generic documents. Applications for smart objects are expressed as a collection of functional tasks (independent of the implementation.) in a corresponding document. A runtime component provides the foundation for mapping these tasks to the corresponding service provider smart objects. there are three primary advantages of our approach- firstly, it allows developers to write applications in a generic way without prior knowledge of the smart objects that could be used by the applications. Secondly;smart object management (locating/accessing/etc.) issues are completely handled by the infrastructure thus application development becomes rapid and simple. Finally;the programming abstraction used in the framework allows extension of functionalities of smart objects and applications very easily. We describe an. implemented prototype of our framework and show examples of its use in a real life scenario to illustrate its feasibility.

关键词： Computer programming

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Automatic SOM compatibility check & FOM development 7

Automatic SOM compatibility check & FOM development

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7th international symposium on distributed Simulation and real-time Applications

作者： Tan, G Hu, Y Moradi, F Natl Univ Singapore Sch Comp Singapore 117543 Singapore

ISBN: (纸本)0769520367

the High Level Architecture (HLA) is widely used in defense applications as a common framework for modeling and simulation. the Federation Development and Execution Process (FEDEP) is a generalized process to build HLA federations from scratch. However simulation model design, implementation, testing and execution defined in the FEDEP are time consuming and expensive. the Model Construction Environment (MCE) is introduced in this paper as a web-based system to enhance the efficiency of the federation development by reusing the existing Simulation object Models (SOM) to build new Federation object Models (FOM). To ensure the compatibility of the SOMs in a FOM, a Matching Algorithm is defined and tested. An Extensible Elements scheme is designed to help shape the characteristics of the FOM/SOMs. this study can contribute to more cost-efficient methodologies for the development and execution of simulation models.

关键词： Buildings Computational modeling Computer architecture Computer simulation distributed computing distributed control Internet Process design Systems engineering and theory Testing

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Aspect-oriented programming with C# and .NET 5

Aspect-oriented programming with C# and .NET

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5th ieee international symposium on object-oriented real-time distributed computing (ISORC 2002)

作者： Schult, W Polze, A Univ Potsdam Hasso Plattner Inst Potsdam Germany

ISBN: (纸本)0769515584

Almost a year ago, Microsoft has introduced the .NET architecture as a new component-based programming environment, which allows for easy integration of classical distributed programming techniques with Web computing. NET defines a type system and introduces notions such as component, object, and interface, which are building blocks for distributed multi-language component-based applications. As many other component frameworks, NET mainly focuses on functional interfaces of components. Nonfunctional aspects of components, such as resource usage (CPU, memory), timing behavior, fault-tolerance, or security requirements are currently not expressed in NET's component interfaces. Within this paper, we discuss the usage of aspect-oriented programming techniques in context of the NET framework. We focus on the fault-tolerance aspect and discuss the expression of non-functional component properties (aspects) as C# custom attributes. Our approach uses reflection to generate replicated objects based on settings of a special "fault-tolerance" attribute for C# components(perpendicular to). We have implemented an aspect-weaver for integration of aspect-code and component-code, which uses the mechanisms of the language-neutral NET type system. therefore, our approach is not restricted to the C# language but works for an), of the NET programming languages.

关键词： Computer architecture Computer languages distributed computing Fault tolerance object oriented modeling Programming environments Reflection Security Service oriented architecture Timing

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On best-effort real-time assurances for recovering from distributable thread failures in distributed real-time systems

On best-effort real-time assurances for recovering from dist...

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10th ieee international symposium on object and Component-oriented real-time distributed computing

作者： Ravindran, Binoy Curley, Edward Anderson, Jonathan S. Jensen, E. Douglas Virginia Tech ECE Dept Blacksburg VA 24061 USA Mitre Corp Bedford MA 01730 USA

ISBN: (纸本)9780769527659

We consider the problem of recovering from failures of distributable threads in distributed real-time systems that operate tinder run-time uncertainties including those on thread execution times, thread arrivals, and node failure occurrences. When a thread encounters a node failure, it causes orphans. Under a termination model, the orphans must be detected and aborted, and exceptions must be delivered to farthest, contiguous surviving thread segment for resuming thread execution. Our application/scheduling model includes distributable threads and their exception handlers that are subject to time/utility function (TUF) time constraints and an utility accrual (UA) optimality criterion. A key underpinning of the TUF/UA scheduling paradigm is the notion of "best-effort" where high importance threads are always favored over low importance ones, irrespective of thread urgency. We present a scheduling algorithm called HUA and a thread integrity protocol called TPR. We show that HUA and TPR bound the orphan cleanup and recovery time with bounded loss of the best-effort property. Our implementation experience of HUA/TPR within Sun's distributed real-time Specification for Java demonstrates the algorithm/protocol's effectiveness.

关键词： real time systems

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An extended object composition model for distributed multimedia services 7

An extended object composition model for distributed multime...

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7th ieee international Workshop on object-oriented real-time Dependable Systems (WORDS 2002)

作者： Kim, DH Lee, KH ETRI Mobile Collaborat Res Team Taejon South Korea

ISBN: (纸本)0769515762

In this paper, we present an object-oriented multimedia data processing model to support a wide variety of applications requiring network-transparent accesses to stored multimedia data, real-time multimedia input devices, and multimedia processing components. Most multimedia solutions address the problem of authoring, storing, and downloading hypermedia data. But these solutions fall short in supporting long-time and continuous media I/O and communications. Our model addresses primitive objects and their compositions for real-time data interleaving, synchronization, routing and delivery as well as acquisition, filtering, and output. these capabilities are abstracted and aggregated within an object-oriented paradigm. As an illustration, an audiovisual teleconference with a shared remote multimedia presentation is interpreted in this paradigm.

关键词： Application software Data processing Filtering Interleaved codes Multimedia systems object oriented modeling real time systems Routing Streaming media Teleconferencing

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