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检索条件"任意字段=International Symposium on Object-Oriented Real-Time Distributed Computing"

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Mobile agent model for distributed object systems 5

Mobile agent model for distributed object systems

引用

5th IEEE international symposium on object-oriented real-time distributed computing, ISORC 2002

作者： Komiya, Takao Ohsida, Hiroyuki Takizawa, Makoto Tokyo Denki University Japan

ISBN: (纸本)0769515584

Application programs are performed on clients and issue requests to object servers. The object servers then send responses to the clients. On the other hand, programs named agents move to object servers where the agents manipulate objects in a mobile agent approach. If agents complete manipulating objects in the servers, the agents move to other servers. If an agent conflicts with other agents on an object server, the agents negotiate with each other to resolve the conflict. If the servers are faulty, agents find another server. In addition, agents are replicated if they are faulty. In this paper, we discuss how to perform agents with different constraints on multiple object servers in the presence of server and agent faults. © 2002 IEEE.

关键词： real time systems

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Modeling distributed embedded applications on an interface file system

Modeling distributed embedded applications on an interface f...

引用

7th IEEE international symposium on object-oriented real-time distributed computing

作者： Elmenreich, W Pitzek, S Schlager, M Univ Vienna Inst Tech Informat Vienna Austria

ISBN: (纸本)076952124X

This paper presents a framework for generic modeling of distributed embedded applications. An application is decomposed into services and mapped on a set of distributed nodes, whereas each node hosts one or more services. Each service is described by four interfaces: a real-time input/output, a configuration and planning (CP), and a diagnostic and management (DM) interface. The overall application is described by a cluster configuration description that specifies the interaction of services within and across nodes. The application requirements, the service properties of a node, and the interaction of the services as well as the application mapping are described formally with XML descriptions. The XML format allows a language-neutral and extensible semantic description of interfaces supporting the implementation of context-aware tools for modeling, scheduling, monitoring, simulation, and validation. A central concept of the model is the interface file system (IFS) that acts as a distributed shared memory and transparently implements the interfaces to services from other nodes. In principle, the communication system that updates the data in the IFS data is not bound to a specific implementation as long as it fulfills the given timing requirements. The presented concepts are applied in a case study that uses the time-triggered fieldbus protocol TTP/A for the implementation of a small sensor fusion application.

关键词： distributed computer systems

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Monitoring distributed real-time activities in DCOM 3

Monitoring distributed real-time activities in DCOM

引用

3rd IEEE international symposium on object-oriented real-time distributed computing, ISORC 2000

作者： Mock, M. Gergeleit, M. Nett, E. Inst. for Autonomous Intelligent Syst. German Nat. Res. Center for Inf. Technol. St. Augustin Germany Germany

ISBN: (纸本)0769506070

object-oriented frameworks have become a key element in the design of distribution systems. They make the existence of the physical and operating system level resources transparent to the designer and provide the abstract view of the distributed systems as a set of objects that interact by invoking well-defined interfaces of each other. Easy reuse of existing components, location transparency and implementation hiding are the main ingredients of such frameworks that simplify the task of designing distributed systems drastically. It is desirable to take advantage of these benefits when designing distributed real-time systems, too. However, this goal conflicts with the essential need to consider the allocation of system resources when real-time requirements must be met. Here, system level resource issues such as execution times on CPUs, thread switches, occurrence of interrupts, and message delays are of primary interest. Our approach to solve this dilemma is to allow and support the designer of distributed real-time object-oriented applications to become aware of system level resources. We present a monitoring tool JewelDC that allows monitoring of distribution activities (i.e. nested sequences of object invocations) in a distributed object-oriented framework. distributed activities are visualized at the abstract object level while simultaneously revealing their use of system level resources. The tool has been implemented for DCOM on Microsoft Windows NT 4.0. © 2000 IEEE.

关键词： Program processors

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BDL, a language of distributed reactive objects 1

BDL, a language of distributed reactive objects

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1st international symposium on object-oriented real-time distributed computing (ISORC 98)

作者： Talpin, JP Benveniste, A Caillaud, B Jard, C Bouziane, Z Canon, H Inst Rech Informat & Syst Aleatoires Inst Natl Rech Informat & Automat F-35042 Rennes France

ISBN: (纸本)0818684321

We introduce the definition of a language of distributed reactive objects, a Behaviour Description Language (BDL), as a unified medium for specifying, verifying, compiling and validating object-oriented distributed reactive systems. One of the novelties in BDL is its seamless integration into the Unified Modeling Language approach (UML). BDL supports a description of objects interaction which respects both the functional architecture of system designs and the declarative style of diagram descriptions. This support is implemented by means of a partial-order theoretical framework. This framework allows to specify both the causality and the control models of object interactions independently of and hypothesis on the actual configuration of the system. Cir en the description of such a configuration, the use of BDL offers new perspectives for a flexible verification of systems by modeling them as an asynchronous network of synchronous components. It allows an optimized code generation by using compilation techniques developed for synchronous languages. It permits an accurate validation and test of applications by supporting the manipulation of both causal and control dependencies. BDL aims at maximizing the re-usability of high-level specifications while minimizing programming effort and test-case based validation of distributed systems.

关键词： Unified Modeling Language

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Service differentiation in real-time main memory databases 5

Service differentiation in real-time main memory databases

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

作者： Kang, KD Son, SH Stankovic, JA Univ Virginia Dept Comp Sci Charlottesville VA 22903 USA

ISBN: (纸本)0769515584

The demand for real-time database services has been increasing recently. Examples include sensor data fusion, stock trading, decision support, web information services, and data-intensive smart spaces. In these systems, it is essential to execute transactions in time using fresh (temporally consistent) data. Due to the high service demand, many transactions may miss their deadlines regardless of their importance. To address the problem, we present a service differentiation architecture for real-time databases. Transactions are classified into several service classes based on their importance. Under overload, different degrees of deadline miss ratio guarantees are provided among the service classes according to their importance. A certain data freshness guarantee is also provided for the data accessed by timely transactions which finish within their deadlines. Feedback control is applied to support the miss ratio and freshness guarantees. In a simulation study, our service differentiation approach shows a significant performance improvement compared to the baseline approaches. The specified miss ratio and freshness are supported even in the presence of unpredictable workloads and data access patterns.

关键词： Computer science Electronic switching systems Feedback control Intelligent sensors object oriented modeling Process control Remote monitoring Sensor fusion Timing Transaction databases

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EXPPO: EXecution Performance Profiling and Optimization for CPS Co-simulation-as-a-Service 23

EXPPO: EXecution Performance Profiling and Optimization for ...

引用

IEEE 23rd international symposium on real-time distributed computing (ISORC)

作者： Barve, Yogesh D. Neema, Himanshu Kang, Zhuangwei Sun, Hongyang Gokhale, Aniruddha Roth, Thomas Vanderbilt Univ Dept Elect Engn & Comp Sci Nashville TN 37212 USA NIST Smart Grid & Cyber Phys Syst Program Off Engn Lab Gaithersburg MD 20899 USA

ISBN: (纸本)9781728169583

A co-simulation may comprise several heterogeneous federates with diverse spatial and temporal execution characteristics. In an iterative time-stepped simulation, a federation exhibits the Bulk Synchronous Parallel (BSP) computation paradigm in which all federates perform local operations and synchronize with their peers before proceeding to the next round of computation. In this context, the lowest performing (i.e., slowest) federate dictates the progression of the federation logical time. One challenge in co-simulation is performance profiling for individual federates and entire federations. The computational resource assignment to the federates can have a large impact on federation performance. Furthermore, a federation may comprise federates located on different physical machines as is the case for cloud and edge computing environments. As such, distributed profiling and resource assignment to the federation is a major challenge for operationalizing the co-simulation execution at scale. This paper presents the Execution Performance Profiling and Optimization (EXPPO) methodology, which addresses these challenges by using execution performance profiling at each simulation execution step and for every federate in a federation. EXPPO uses profiling to learn performance models for each federate, and uses these models in its federation resource recommendation tool to solve an optimization problem that improves the execution performance of the co-simulation. Using an experimental testbed, the efficacy of EXPPO is validated to show the benefits of performance profiling and resource assignment in improving the execution runtimes of co-simulations while also minimizing the execution cost.

关键词： cyber-physical systems distributed simulation cloud computing latency performance resource management gang scheduling

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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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distributed real-time computing in autonomous robots using time-triggered and Message-triggered objects (TMOs)

Distributed real-time computing in autonomous robots using T...

引用

9th IEEE international symposium on object-oriented real-time distributed computing, ISORC 2006

作者： Biermeyer, Jan O. Srini, Vason P. Kleinjohann, Bernd DREAM Lab. University of California Irvine Datafluxsystems Inc. Berkeley C-Lab. University of Paderborn Germany

ISBN: (纸本)076952561X

distributed real-time computing is one of the enabling technologies in establishing a team of autonomous robots. A team of soccer playing robots, Paderkicker, contains many computing nodes handling environment perception, artificial intelligence, team coordination, autonomous actuation, and interactions with external entities such as a remote server. Robots must act with varying degrees of autonomy in real-time. The time-triggered Message-triggered object (TMO) programming scheme offers a high-level high-precision approach to programming of distributed real-time computing operations. The TMO programmer can apply deadlines to method executions and result-arrivals in a straightforward way. He is thus relieved from dealing with low-level resource allocation details and can show considerably increased productivity. This paper describes a TMO structuring approach for constructing teams of autonomous robots. A TMO network architecture is described for the Paderkicker team. © 2006 IEEE.

关键词： distributed computer systems

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Long-term location data management for distributed moving object Databases

Long-term location data management for distributed moving ob...

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

作者： Lee, Ho Hwang, Jaeil Lee, Joonwoo Park, Seungyong Lee, Chungwoo Nah, Yunmook Jeon, Segil Kim, Moon Hae Dankook Univ Seoul South Korea Konkuk Univ Seoul South Korea

ISBN: (纸本)076952561X

To handle the extreme situation that must manage positional information of a very large volume, at least millions, of moving objects, a cluster-based scalable distributed computing system architecture, called the GALIS, which consists of multiple data processors, each dedicated to keeping records relevant to a different geographical zone and a different time zone, was proposed In this paper, we propose a valid time management and time-zone shifting scheme, which are essential in realizing the long-term location data subsystem of GALIS, but missed in our previous prototype development. We explain how to manage valid time of moving objects to avoid ambiguity of location information. We also describe time-zone shifting algorithm, with three variations, such as RT-TZS, B-TZS and TPB-TZS. Through experiments related with query processing time and CPU utilization, we show the efficiency of the proposed time-zone shifting schemes.

关键词： object oriented programming

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An evaluation of aspect-oriented programming for java-based real-time systems development

An evaluation of aspect-oriented programming for java-based ...

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Proceedings - Seventh IEEE international symposium on object-oriented real-time distributed computing

作者： Tsang, Shiu Lun Clarke, Siobhán Baniassad, Elisa Distributed Systems Group Department of Computer Science Trinity College Dublin Dublin 2 Ireland

ISBN: (纸本)076952124X

Some concerns, such as debugging or logging functionality, cannot be captured cleanly, and are often tangled and scattered throughout the code base. These concerns are called crosscutting concerns. Aspect-oriented Programming (AOP) is a paradigm that enables developers to capture crosscutting concerns in separate aspect modules. The use of aspects has been shown to improve understandability and maintainability of systems. It has been shown that real-time concerns, such as memory management and thread scheduling, are crosscutting concerns [5, 6, 9, 11]. However it is unclear whether encapsulating these concerns provides benefits. We were interested in determining whether using AOP to encapsulate real-time crosscutting concerns afforded benefits in system properties such as understandability and maintainability. This paper presents research comparing the system properties of two systems: a real-time sentient traffic simulator and its Aspect-oriented equivalent. An evaluation of AOP is presented indicating both benefits and drawbacks with this approach.

关键词： Java programming language

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