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Author: University of Illinois at Urbana-Champaign. Department of Computer Science Publisher: ISBN: Category : Buffer storage (Computer science) Languages : en Pages : 190
Book Description
In a real-time network, it is not practical to have one centralized scheduler manage all the network resources, e.g., the transmission links and buffer space. Instead, each node has its own scheduler which manages the various resources at that node. In an ideal case, the schedulers are completely independent, and the well-known scheduling and analysis techniques developed for single-node systems can be used, thus greatly simplifying the real-time network design. However the use of independent schedulers may lead to buffer overruns or missed deadlines and hence, network failure. This thesis addresses the problems that arise in scheduling real-time messages in a packet-switched network that has multiple schedulers and has limited buffer space. In our development of the schedulers and the mechanisms for synchronization between the schedulers, we address the following issues: the complexity of the scheduler, the complexity of the synchronization mechanism, the scheme for admission control, the achievable utilization of the network, the ability of the scheduler to meet diverse real-time requests, and the robustness of the scheduler under unpredictable conditions such as temporary overload.
Author: University of Illinois at Urbana-Champaign. Department of Computer Science Publisher: ISBN: Category : Buffer storage (Computer science) Languages : en Pages : 190
Book Description
In a real-time network, it is not practical to have one centralized scheduler manage all the network resources, e.g., the transmission links and buffer space. Instead, each node has its own scheduler which manages the various resources at that node. In an ideal case, the schedulers are completely independent, and the well-known scheduling and analysis techniques developed for single-node systems can be used, thus greatly simplifying the real-time network design. However the use of independent schedulers may lead to buffer overruns or missed deadlines and hence, network failure. This thesis addresses the problems that arise in scheduling real-time messages in a packet-switched network that has multiple schedulers and has limited buffer space. In our development of the schedulers and the mechanisms for synchronization between the schedulers, we address the following issues: the complexity of the scheduler, the complexity of the synchronization mechanism, the scheme for admission control, the achievable utilization of the network, the ability of the scheduler to meet diverse real-time requests, and the robustness of the scheduler under unpredictable conditions such as temporary overload.
Author: Kemal Bengi Publisher: Springer Science & Business Media ISBN: 1461509610 Category : Computers Languages : en Pages : 270
Book Description
The fast growing traffic demand in telecommunication networks, by use of the Internet and an increasing number of broadband services for multimedia com munications, requires new high performance networking technologies. As such, optical WDM networks are playing a pivotal role. Wavelength Division Mul tiplexing (WDM) with many hundreds of wavelength channels per fiber is ex tensively being exploited in wide area networks. With respect to the ongoing trend towards a completely packet-switched mode of operation for all services, WDM networks must be prepared accordingly. This work concentrates on optical packet-switched networking in local and metro area networks for realizing high-performance applications like virtual re ality, medical imaging, and supercomputing. It is well known that in those networks using a star, bus, or ring shared medium, an access protocol is nec essary to guarantee controlled and fair access for all attached nodes. Similar access protocols are to be developed and analyzed for WDM local and metro area networks. Already, many media access protocols for these networks have been described in the literature. However, some aspects of Quality-of-Service (QoS) for different service classes are still an open issue and subject to inten sive research activities. In the introduction, the author, Dr. Kemal Bengi, gives a short classification of media access protocols and network architectures for WDM local and metro area networks. The need for service classes is also em phasized.
Author: C. Siva Ram Murthy Publisher: MIT Press ISBN: 9780262133760 Category : Business & Economics Languages : en Pages : 472
Book Description
This book introduces the concepts and state-of-the-art research developments of resource management in real-time systems and networks. Real-time systems and networks are of increasing importance in many applications, including automated factories, telecommunication systems, defense systems, and space systems. This book introduces the concepts and state-of-the-art research developments of resource management in real-time systems and networks. Unlike other texts in the field, it covers the entire spectrum of issues in resource management, including task scheduling in uniprocessor real-time systems; task scheduling, fault-tolerant task scheduling, and resource reclaiming in multiprocessor real-time systems; conventional task scheduling and object-based task scheduling in distributed real-time systems; message scheduling; QoS routing; dependable communication; multicast communication; and medium access protocols in real-time networks. It provides algorithmic treatments for all of the issues addressed, highlighting the intuition behind each algorithm and giving examples. The book also includes two chapters of case studies.
Author: Gary M. Koob Publisher: Springer Science & Business Media ISBN: 0792394860 Category : Computers Languages : en Pages : 325
Book Description
Foundations of Dependable Computing: System Implementation, explores the system infrastructure needed to support the various paradigms of Paradigms for Dependable Applications. Approaches to implementing support mechanisms and to incorporating additional appropriate levels of fault detection and fault tolerance at the processor, network, and operating system level are presented. A primary concern at these levels is balancing cost and performance against coverage and overall dependability. As these chapters demonstrate, low overhead, practical solutions are attainable and not necessarily incompatible with performance considerations. The section on innovative compiler support, in particular, demonstrates how the benefits of application specificity may be obtained while reducing hardware cost and run-time overhead. A companion to this volume (published by Kluwer) subtitled Models and Frameworks for Dependable Systems presents two comprehensive frameworks for reasoning about system dependability, thereby establishing a context for understanding the roles played by specific approaches presented in this book's two companion volumes. It then explores the range of models and analysis methods necessary to design, validate and analyze dependable systems. Another companion to this book (published by Kluwer), subtitled Paradigms for Dependable Applications, presents a variety of specific approaches to achieving dependability at the application level. Driven by the higher level fault models of Models and Frameworks for Dependable Systems, and built on the lower level abstractions implemented in a third companion book subtitled System Implementation, these approaches demonstrate how dependability may be tuned to the requirements of an application, the fault environment, and the characteristics of the target platform. Three classes of paradigms are considered: protocol-based paradigms for distributed applications, algorithm-based paradigms for parallel applications, and approaches to exploiting application semantics in embedded real-time control systems.
Author: Jing Chen Publisher: Springer ISBN: 354024686X Category : Computers Languages : en Pages : 634
Book Description
This volume contains the 37 papers presented at the 9th International Con- rence on Real-Time and Embedded Computing Systems and Applications (RT- CSA 2003). RTCSA is an international conference organized for scientists and researchers from both academia and industry to hold intensive discussions on advancing technologies topics on real-time systems, embedded systems, ubiq- tous/pervasive computing, and related topics. RTCSA 2003 was held at the Department of Electrical Engineering of National Cheng Kung University in Taiwan. Paper submissions were well distributed over the various aspects of real-time computing and embedded system technologies. There were more than 100 participants from all over the world. The papers, including 28 regular papers and 9 short papers are grouped into thecategoriesofscheduling,networkingandcommunication,embeddedsystems, pervasive/ubiquitous computing, systems and architectures, resource mana- ment, ?le systems and databases, performance analysis, and tools and de- lopment. The grouping is basically in accordance with the conference program. Earlier versions of these papers were published in the conference proceedings. However, some papers in this volume have been modi?ed or improved by the authors, in various aspects, based on comments and feedback received at the conference. It is our sincere hope that researchers and developers will bene?t from these papers. We would like to thank all the authors of the papers for their contribution. We thank the members of the program committee and the reviewers for their excellent work in evaluating the submissions. We are also very grateful to all the members of the organizing committees for their help, guidance and support.
Author: Publisher: ISBN: Category : Computers Languages : en Pages : 688
Book Description
The proceedings of ICDCS-13 comprise 74 papers in the areas of distributed system architecture and shared memory; distributed operating systems; distributed databases and information systems; distributed system services and management; distributed applications and cooperative work; communication arc
Author: University of Illinois at Urbana-Champaign. Department of Computer Science
Author: University of Illinois at Urbana-Champaign. Department of Computer Science
Author: Shirish S. Sathaye
Author: Kemal Bengi
Author: C. Siva Ram Murthy
Author: Gary M. Koob
Author: Sudhir Madhava Rao
Author: Jing Chen
Author: Jose Duato
Author: 
Author: Padmini Vellore