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检索条件"任意字段=9th IEEE International Symposium on Object and Component-Oriented Real-Time Distributed Computing"

共 393 条记录，以下是341-350 订阅

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Efficient Adaptations of the Non-Blocking Buffer for Event Message Communication between real-time threads

Efficient Adaptations of the Non-Blocking Buffer for Event M...

引用

international symposium on object-oriented real-time distributed computing

作者： K.H. Kim Juan A. Colmenares Kee-Wook Rim Department of Electrical Engineering and Computer Science University of California Irvine USA Computing Institute Engineering Faculty University of Zulia Venezuela Division of Computer and Information Sciences Sunmoon University South Korea

Enabling message communication among concurrent computing threads without relying on mutual exclusion (i.e., locking) is highly desirable in real-time computing systems. this paper presents a refined version of the Non-Blocking Buffer (NBB), which is a lock-free interaction mechanism that enables efficient event-message communication between a single producer thread and a single consumer thread. the NBB scheme presented here contains improvements over the previous version in two aspects. First, application designers now have the flexibility of choosing the consumer's retry strategy for the case when the buffer is empty but the producer is in the middle of inserting an item. Second, in the refined version the producer inserts pointers to data items into the buffer whereas the consumer obtains copies of the items. this design is consistent with the fact that shared heap management must be avoided to enable fully lock-free interaction between the producer and the consumer. this paper also discusses the approaches based on the NBB mechanism for supporting all conceivable producer-consumer scenarios.

关键词： Yarn real time systems Concurrent computing Timing Refining Middleware distributed computing Operating systems Programming profession Design engineering

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Design and Performance Evaluation of Configurable component Middleware for End-to-End Adaptation of distributed real-time Embedded Systems

Design and Performance Evaluation of Configurable Component ...

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international symposium on object-oriented real-time distributed computing

作者： Nishanth Shankaran Douglas C. Schmidt Xenofon D. Koutsoukos Yingming Chen Chenyang Lu Department of EECS Vanderbilt University Nashville TN USA Department of Computer Science and Engineering Washington University Saint Louis USA

Standards-based quality of service (QoS)-enabled component middleware is increasingly being used as a platform for developing distributed real-time embedded (DRE) systems that execute in open environments where operational conditions, input workload, and resource availability cannot be characterized accurately a priori. Although QoS-enabled component middleware offers many desirable features, until recently it lacked the ability to efficiently allocate resources and configure platform-specific QoS settings based on utilization of system resources and application QoS. Moreover, it has also lacked the ability to monitor and enforce application QoS requirements. this paper presents two contributions to research on adaptive resource management for component-based DRE systems. First, we describe the structure and functionality of the resource allocation and control engine (RACE), which is an open-source adaptive resource management framework built atop standards-based QoS-enabled component middleware. Second, we demonstrate the effectiveness of RACE in the context of a representative DRE system: NASA's magneto spheric multi-scale mission system

关键词： Middleware real time systems Embedded system Quality of service Resource management Availability Monitoring Engines Open source software Programmable control

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real-time Tasks Scheduling with Value Control to Predict Timing Faults During Overload

Real-Time Tasks Scheduling with Value Control to Predict Tim...

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international symposium on object-oriented real-time distributed computing

作者： Crineu Tres Leandro Buss Becker Edgar Nett Automation and Systems Department Federal University of Santa Catarina Florianopolis Santa Catarina Brazil Otto-von-Guericke Universität Magdeburg Institute for Distributed Systems (IVS) Magdeburg Germany

Modern real-time applications are very dynamic and cannot cope with the use of worst case execution time to avoid overload situations. therefore scheduling algorithms that are able to prevent timing faults during overload are required. In this context, the value parameter has become useful to add generality and flexibility to such systems. In this paper, we present the scheduling algorithm called DMB (dynamic misses based), which is capable of dynamically changing tasks value in order to adjust their importance according to its timing faults rate. the main goal of DMB is to allow the prediction of timing faults during overloads and thereby support a dynamic tuning of tasks fault rate. It is used to enhance the features of the previously defined TAFT (time-aware fault-tolerant) scheduler. Obtained results show that DMB in conjunction with TAFT reached the most promising results during overloads, allowing to control tasks degradation in a graceful and determined way

关键词： Timing Processor scheduling Scheduling algorithm Digital multimedia broadcasting real time systems Dynamic scheduling Fault tolerance Automatic control Control systems Automation

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Towards a Layered Architecture for object-Based Execution in Wide-Area Deeply Embedded computing

Towards a Layered Architecture for Object-Based Execution in...

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international symposium on object-oriented real-time distributed computing

作者： Tarek Abdelzaher Qing Cao Raghu Ganti Dan Henriksson Maifi Khan Jin Heo Chengdu Huang Praveen Jayachandran Hieu Khac Le Liqian Luo Yu-En Tsai Department of Computer Science University of Illinois Urbana-Champaign Urbana IL USA

Sensor networks introduce a new application domain and set of challenges in distributed computing including new network-level programming languages, global system abstractions, and general-purpose communication protocols. these challenges are brought about by the tight integration of computation, communication, and distributed real-time interaction with the physical world. With the growing interest in interconnecting different sensor networks across a wide-area communication infrastructure, an overarching challenge becomes one of arriving at an agreed-upon global sensor network architecture that ensures interoperability. Unlike the Internet, where a layered communication stack (namely, the TCP/IP stack) defines the network architecture, a sensor network architecture must unify not only communication interfaces but also programming interfaces, since network communication and computation functions are tightly intertwined. In that sense, the sensor network architecture refers to a layered stack of distributed computing abstractions. this paper presents an architecture and key considerations in designing and interconnecting local and global sensor networks. Candidate protocols and middleware instantiations are described from the authors' ongoing work that meet the discussed considerations

关键词： Computer architecture Embedded computing distributed computing Protocols Sensor systems and applications Computer languages Physics computing LAN interconnection IP networks TCPIP

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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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international symposium on object-oriented real-time distributed computing

作者： Binoy Ravindran Edward Curley Jonathan S. Anderson E. Douglas Jensen ECE Department Virginia Polytechnic Institute and State University Blacksburg VA USA MITRE Corporation Bedford MA USA

We consider the problem of recovering from failures of distributable threads in distributed real-time systems that operate under 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 a 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 Yarn time factors Uncertainty Scheduling algorithm Subscriptions Protocols Sun Java Processor scheduling

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Compositional Schedulability Analysis of Hierarchical real-time Systems

Compositional Schedulability Analysis of Hierarchical Real-T...

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international symposium on object-oriented real-time distributed computing

作者： Arvind Easwaran Insup Lee Insik Shin Oleg Sokolsky Department of Computer and Information Science University of Pennsylvania Philadelphia PA USA

Embedded systems are complex as a whole but consist of smaller independent modules interacting with each other. this structure makes them amenable to compositional design. real-time embedded systems consist of realtime workloads having deadlines. Compositional design of such systems can be done using real-time components arranged in a scheduling hierarchy. Each component consists of some real-time workload and a scheduling policy for the workload. To simplify schedulability analysis for such systems, analysis should be done compositionally using interfaces that abstract timing requirement of components. To facilitate analysis of dynamically changing systems, the framework should also support incremental analysis. In this paper, we overview our approach to compositional and incremental schedulability analysis of hierarchical real-time systems. We describe a compositional analysis technique that abstracts resource requirement of components using periodic resource models. To support incremental analysis and resource bandwidth minimization, we describe an extension to this interface model. Each extended interface consists of multiple periodic resource models for different periods. this allows the selection of a periodic model that can schedule the system using minimum bandwidth. We also account for context switch overhead of components in these extended interfaces. We then describe an associative composition technique for such interfaces, that supports incremental analysis

关键词： real time systems Switches Resource management Timing Bandwidth Independent component analysis Embedded system Open systems Processor scheduling Abstracts

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XtreemOS: A Grid Operating System Making your Computer Ready for Participating in Virtual Organizations

XtreemOS: A Grid Operating System Making your Computer Ready...

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international symposium on object-oriented real-time distributed computing

作者： Christine Morin Paris Project-Team XtreemOS Scientific Coordinator IRISA/INRIA France

the overall objective of the XtreemOS project is the design, implementation, evaluation and distribution of an open source grid operating system (named XtreemOS) with native support for virtual organizations (VO) and capable of running on a wide range of underlying platforms, from clusters to mobiles. the approach we propose is to investigate the design of a grid OS, XtreemOS, based on the Linux existing general purpose OS. A set of system services, extending those found in the traditional Linux, will provide users with all the grid capabilities associated with current grid middleware, but fully integrated into the OS. the underlying Linux will be extended as needed to support VOs spanning across many machines and to provide appropriate interfaces to the Grid OS services. Installed on each participating machine, the XtreemOS system will provide for the grid what an operating system offers for a single computer: abstraction from the hardware, and secure resource sharing between different users. It would thus considerably ease the work of users belonging to VOs by giving them (as far as possible) the illusion of using a traditional computer, and releasing them from dealing with the complex resource management issues of a grid environment. By integrating grid capabilities into the kernel, XtreemOS will also provide a robust, secure and easy to manage infrastructure for system administrators

关键词： Operating systems Grid computing distributed computing Linux Middleware Resource management Kernel Programming profession Mobile computing Hardware

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Dependable and secure TMO scheme

Dependable and secure TMO scheme

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

作者： Kim, Jungin thuraisingham, Bhavani Univ Texas Dept Comp Sci Austin TX 78712 USA

ISBN: (纸本)076952561X

In a real-time distributed computing environment, security is critical to protect the system from unauthorized access especially since such systems are being used in time critical applications. Access Control mechanisms have been introduced during the last several decades and have offered a basic and powerful means for enforcing security. In this paper, we examine the concepts of the TMO (time Triggered Message Triggered object) scheme that provides guaranteed real-time services in a distributed object computing environment. We also examine access control mechanisms;such as the traditional model, the RBAC (Role-based Access Control) model and the UCON (Usage Control) model. the main contribution of this paper is applying the traditional, RBAC and UCON models to the TMO scheme in order to provide a secure real-time distributed environment.

关键词： distributed computer systems

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An ieee1394-based real-time distributed IPC system for collaborating TMO's

An IEEE1394-based real-time distributed IPC system for colla...

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

作者： Son, Jae Gi Park, Sang Hyun Kim, Jung-Guk Kim, Moon Hae Hankuk Univ Foreign Studies Seoul South Korea Konkuk Univ Seoul South Korea

ISBN: (纸本)076952561X

the TMO (time-triggered Message-triggered object) model is a well-known real-time object model for distributed timeliness computing. In a couple of years ago, we developed a Linux-based real-time kernel, named TMO-Linux, supporting deadline driven executions of TMO. TMO-Linux and its distributed IPC subsystem have been used well in developing networked control systems consisting of cooperating embedded devices, but there have difficulties in executing some TMO applications accurately due to the lack of timeliness in distributed communications. To overcome this problem, we newly developed a real-time distributed IPC over ieee1394 for the TMO-Linux kernel. In the new system, predictable delivery services for real-time messages are provided by isochronous transmissions of ieee1394. To implement predictable delivery services, each node is set to have its own isochronous channel for receiving data that is allocated to a fixed time-slot bandwidth in an ieee1394 flame. this paper presents an implementation technique for the ieee]394-based real-time distributed IPC and collaborations of computing nodes using TMO-Linux.

关键词： distributed computer systems

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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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