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Author : R. Bettati
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.:/5 (23 download)
Download or read book Algorithms for End-to-end Scheduling to Meet Deadlines written by R. Bettati and published by . This book was released on 1990 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : W. Feng
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (31 download)
Download or read book Algorithms for Scheduling Tasks with Input Error and End-to-end Deadlines written by W. Feng and published by . This book was released on 1994 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "This paper describes heuristic algorithms for scheduling preemptive, imprecise, composite tasks with input error and end- to-end timing constraints. Each composite task consists of a chain of component tasks, where each component task is made up of a mandatory part and an optional part. Whenever a component task uses imprecise input, the mandatory and optional parts of the component task may be extended in order to compensate for input error. We use a two-level scheduler. At the high level, the scheduler schedules the composite tasks preemptively on one processor, according to an existing algorithm for scheduling simple imprecise tasks. The result is the total amount of time budgeted to each composite task in order for all composite tasks to meet their end-to-end deadlines. The low-level scheduler then distributes the time budgeted for each composite task across its component tasks so as to minimize the output error of each composite task."
Author : Riccardo Bettati
Publisher :
ISBN 13 :
Total Pages : 152 pages
Book Rating : 4.:/5 (258 download)
Download or read book End-to-end Scheduling to Meet Deadlines in Distributed Systems written by Riccardo Bettati and published by . This book was released on 1994 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a distributed real-time system or communication network, tasks may need to be executed on more than one processor. For time-critical tasks, the timing constraints are typically given as end-to-end release times and deadlines. This thesis describes algorithms to schedule a class of systems where all the tasks execute on different processors in turn in the same order. This end-to-end scheduling problem is known as the flow-shop problem. We present several cases where the problem is tractable and evaluate two heuristic algorithms for the NP-hard general case. We generalize the traditional flow-shop model in two directions. First, we present two algorithms for scheduling flow shops where tasks can be serviced more than once by some processors. Second, we describe a technique to schedule flow shops that consist of periodic tasks and to analyze their schedulability. We generalize this technique and describe how it can be used to schedule distributed systems that can not be modeled by flow shops. We then describe how to combine local or global resource access protocols and end-to-end scheduling. Finally, we show that by using end-to-end scheduling we can simplify resource access protocols and thus increase the utilization of resources.
Author : André M. van Tilborg
Publisher : Springer Science & Business Media
ISBN 13 : 1461539560
Total Pages : 331 pages
Book Rating : 4.4/5 (615 download)
Download or read book Foundations of Real-Time Computing: Scheduling and Resource Management written by André M. van Tilborg and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains a selection of papers that focus on the state-of the-art in real-time scheduling and resource management. Preliminary versions of these papers were presented at a workshop on the foundations of real-time computing sponsored by the Office of Naval Research in October, 1990 in Washington, D.C. A companion volume by the title Foundations of Real-Time Computing: Fonnal Specifications and Methods complements this book by addressing many of the most advanced approaches currently being investigated in the arena of formal specification and verification of real-time systems. Together, these two texts provide a comprehensive snapshot of current insights into the process of designing and building real-time computing systems on a scientific basis. Many of the papers in this book take care to define the notion of real-time system precisely, because it is often easy to misunderstand what is meant by that term. Different communities of researchers variously use the term real-time to refer to either very fast computing, or immediate on-line data acquisition, or deadline-driven computing. This text is concerned with the very difficult problems of scheduling tasks and resource management in computer systems whose performance is inextricably fused with the achievement of deadlines. Such systems have been enabled for a rapidly increasing set of diverse end-uses by the unremitting advances in computing power per constant-dollar cost and per constant-unit-volume of space. End-use applications of deadline-driven real-time computers span a spectrum that includes transportation systems, robotics and manufacturing, aerospace and defense, industrial process control, and telecommunications.
Author : John A. Stankovic
Publisher : Springer Science & Business Media
ISBN 13 : 1461555353
Total Pages : 280 pages
Book Rating : 4.4/5 (615 download)
Download or read book Deadline Scheduling for Real-Time Systems written by John A. Stankovic and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many real-time systems rely on static scheduling algorithms. This includes cyclic scheduling, rate monotonic scheduling and fixed schedules created by off-line scheduling techniques such as dynamic programming, heuristic search, and simulated annealing. However, for many real-time systems, static scheduling algorithms are quite restrictive and inflexible. For example, highly automated agile manufacturing, command, control and communications, and distributed real-time multimedia applications all operate over long lifetimes and in highly non-deterministic environments. Dynamic real-time scheduling algorithms are more appropriate for these systems and are used in such systems. Many of these algorithms are based on earliest deadline first (EDF) policies. There exists a wealth of literature on EDF-based scheduling with many extensions to deal with sophisticated issues such as precedence constraints, resource requirements, system overload, multi-processors, and distributed systems. Deadline Scheduling for Real-Time Systems: EDF and Related Algorithms aims at collecting a significant body of knowledge on EDF scheduling for real-time systems, but it does not try to be all-inclusive (the literature is too extensive). The book primarily presents the algorithms and associated analysis, but guidelines, rules, and implementation considerations are also discussed, especially for the more complicated situations where mathematical analysis is difficult. In general, it is very difficult to codify and taxonomize scheduling knowledge because there are many performance metrics, task characteristics, and system configurations. Also, adding to the complexity is the fact that a variety of algorithms have been designed for different combinations of these considerations. In spite of the recent advances there are still gaps in the solution space and there is a need to integrate the available solutions. For example, a list of issues to consider includes: preemptive versus non-preemptive tasks, uni-processors versus multi-processors, using EDF at dispatch time versus EDF-based planning, precedence constraints among tasks, resource constraints, periodic versus aperiodic versus sporadic tasks, scheduling during overload, fault tolerance requirements, and providing guarantees and levels of guarantees (meeting quality of service requirements). Deadline Scheduling for Real-Time Systems: EDF and Related Algorithms should be of interest to researchers, real-time system designers, and instructors and students, either as a focussed course on deadline-based scheduling for real-time systems, or, more likely, as part of a more general course on real-time computing. The book serves as an invaluable reference in this fast-moving field.
Author : Jose Rolim
Publisher : Springer
ISBN 13 : 3540455914
Total Pages : 667 pages
Book Rating : 4.5/5 (44 download)
Download or read book Parallel and Distributed Processing written by Jose Rolim and published by Springer. This book was released on 2003-06-26 with total page 667 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the proceedings from the workshops held in conjunction with the IEEE International Parallel and Distributed Processing Symposium, IPDPS 2000, on 1-5 May 2000 in Cancun, Mexico. The workshopsprovidea forum for bringing together researchers,practiti- ers, and designers from various backgrounds to discuss the state of the art in parallelism.Theyfocusondi erentaspectsofparallelism,fromruntimesystems to formal methods, from optics to irregular problems, from biology to networks of personal computers, from embedded systems to programming environments; the following workshops are represented in this volume: { Workshop on Personal Computer Based Networks of Workstations { Workshop on Advances in Parallel and Distributed Computational Models { Workshop on Par. and Dist. Comp. in Image, Video, and Multimedia { Workshop on High-Level Parallel Prog. Models and Supportive Env. { Workshop on High Performance Data Mining { Workshop on Solving Irregularly Structured Problems in Parallel { Workshop on Java for Parallel and Distributed Computing { WorkshoponBiologicallyInspiredSolutionsto ParallelProcessingProblems { Workshop on Parallel and Distributed Real-Time Systems { Workshop on Embedded HPC Systems and Applications { Recon gurable Architectures Workshop { Workshop on Formal Methods for Parallel Programming { Workshop on Optics and Computer Science { Workshop on Run-Time Systems for Parallel Programming { Workshop on Fault-Tolerant Parallel and Distributed Systems All papers published in the workshops proceedings were selected by the p- gram committee on the basis of referee reports. Each paper was reviewed by independent referees who judged the papers for originality, quality, and cons- tency with the themes of the workshops.
Author : Jacek Błażewicz
Publisher :
ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (897 download)
Download or read book Simple Algorithms for Multiprocessor Scheduling to Meet Deadlines written by Jacek Błażewicz and published by . This book was released on 1977 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Shi-Yu Huang
Publisher : Springer Science & Business Media
ISBN 13 : 940157975X
Total Pages : 472 pages
Book Rating : 4.4/5 (15 download)
Download or read book Intelligent Decision Support written by Shi-Yu Huang and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intelligent decision support is based on human knowledge related to a specific part of a real or abstract world. When the knowledge is gained by experience, it is induced from empirical data. The data structure, called an information system, is a record of objects described by a set of attributes. Knowledge is understood here as an ability to classify objects. Objects being in the same class are indiscernible by means of attributes and form elementary building blocks (granules, atoms). In particular, the granularity of knowledge causes that some notions cannot be expressed precisely within available knowledge and can be defined only vaguely. In the rough sets theory created by Z. Pawlak each imprecise concept is replaced by a pair of precise concepts called its lower and upper approximation. These approximations are fundamental tools and reasoning about knowledge. The rough sets philosophy turned out to be a very effective, new tool with many successful real-life applications to its credit. It is worthwhile stressing that no auxiliary assumptions are needed about data, like probability or membership function values, which is its great advantage. The present book reveals a wide spectrum of applications of the rough set concept, giving the reader the flavor of, and insight into, the methodology of the newly developed disciplines. Although the book emphasizes applications, comparison with other related methods and further developments receive due attention.
Author : Joseph Y-T. Leung
Publisher : CRC Press
ISBN 13 : 1135438854
Total Pages : 1215 pages
Book Rating : 4.1/5 (354 download)
Download or read book Handbook of Scheduling written by Joseph Y-T. Leung and published by CRC Press. This book was released on 2004-04-27 with total page 1215 pages. Available in PDF, EPUB and Kindle. Book excerpt: Researchers in management, industrial engineering, operations, and computer science have intensely studied scheduling for more than 50 years, resulting in an astounding body of knowledge in this field. Handbook of Scheduling: Algorithms, Models, and Performance Analysis, the first handbook on scheduling, provides full coverage of the most recent and advanced topics on the subject. It assembles researchers from all relevant disciplines in order to facilitate cross-fertilization and create new scheduling insights. The book comprises six major parts, each of which breaks down into smaller chapters: · Part I introduces materials and notation, with tutorials on complexity theory and algorithms for the minimization of makespan, total completion time, dual objectives, maximum lateness, the number of late jobs, and total tardiness. · Part II is devoted to classical scheduling problems. · Part III explores scheduling models that originate in computer science, operations research, and management science. · Part IV examines scheduling problems that arise in real-time systems, focusing on meeting hard deadline constraints while maximizing machine utilization. · Part V discusses stochastic scheduling and queueing networks, highlighting jobs that are not deterministic. · Part VI covers applications, discussing scheduling problems in airline, process, and transportation industries, as well as in hospitals and educational institutions.
Author :
Publisher :
ISBN 13 :
Total Pages : 568 pages
Book Rating : 4.:/5 (317 download)
Download or read book The Sixth Annual Workshop on Space Operations Applications and Research (SOAR 1992) written by and published by . This book was released on 1993 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Wolfgang A. Halang
Publisher : Pergamon
ISBN 13 :
Total Pages : 166 pages
Book Rating : 4.:/5 (321 download)
Download or read book Real Time Programming written by Wolfgang A. Halang and published by Pergamon. This book was released on 1992 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Paperback. The workshop on real time programming provides an opportunity to assess the state-of-the-art, to present new results, and to discuss possible lines of future developments. The book's primary focus is on software development for real time systems and real time operating systems. The 27 papers presented in this book, cover the following areas: scheduling, operating systems, tools, programming languages, experience and case studies.
Author : Jun Sun
Publisher :
ISBN 13 :
Total Pages : 38 pages
Book Rating : 4.:/5 (31 download)
Download or read book Bounding the End-to-end Response Times of Tasks in a Distributed Real-time System Using the Direct Synchronization Protocol written by Jun Sun and published by . This book was released on 1996 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "In a distributed real-time system, a task may consist of a chain of subtasks which execute on different processors. In order to guarantee that all timing constraints are met in such a system, it is imperative to be able to determine the end-to-end response time for each task. This report focuses on distributed systems where tasks are periodic and scheduled according to fixed priority scheduling algorithms. Moreover, if a subtask has predecessors, every instance of the subtask is released as soon as the corresponding instance of the immediate predecessor subtask completes. This report describes an algorithm that can be used to find upper bounds on the end-to-end response times of tasks in such a distributed real-time system."
Author : André M. van Tilborg
Publisher : Springer Science & Business Media
ISBN 13 : 9780792391661
Total Pages : 346 pages
Book Rating : 4.3/5 (916 download)
Download or read book Foundations of Real-Time Computing: Scheduling and Resource Management written by André M. van Tilborg and published by Springer Science & Business Media. This book was released on 1991-07-31 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains a selection of papers that focus on the state-of the-art in real-time scheduling and resource management. Preliminary versions of these papers were presented at a workshop on the foundations of real-time computing sponsored by the Office of Naval Research in October, 1990 in Washington, D.C. A companion volume by the title Foundations of Real-Time Computing: Fonnal Specifications and Methods complements this book by addressing many of the most advanced approaches currently being investigated in the arena of formal specification and verification of real-time systems. Together, these two texts provide a comprehensive snapshot of current insights into the process of designing and building real-time computing systems on a scientific basis. Many of the papers in this book take care to define the notion of real-time system precisely, because it is often easy to misunderstand what is meant by that term. Different communities of researchers variously use the term real-time to refer to either very fast computing, or immediate on-line data acquisition, or deadline-driven computing. This text is concerned with the very difficult problems of scheduling tasks and resource management in computer systems whose performance is inextricably fused with the achievement of deadlines. Such systems have been enabled for a rapidly increasing set of diverse end-uses by the unremitting advances in computing power per constant-dollar cost and per constant-unit-volume of space. End-use applications of deadline-driven real-time computers span a spectrum that includes transportation systems, robotics and manufacturing, aerospace and defense, industrial process control, and telecommunications.
Author :
Publisher :
ISBN 13 :
Total Pages : 688 pages
Book Rating : 4.3/5 (91 download)
Download or read book Distributed Computing Systems, 14th Conference (ICDCS-14) written by and published by . This book was released on 1994 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 :
Publisher :
ISBN 13 :
Total Pages : 916 pages
Book Rating : 4.:/5 (31 download)
Download or read book Proceedings of the Second IEEE Symposium on Parallel and Distributed Processing, 1990 written by and published by . This book was released on 1990 with total page 916 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings of the Second IEEE Symposium on title], held in Dallas, December 1990, comprise 143 papers on topics in algorithm, task scheduling, networks, operating systems, databases, architecture, fault tolerance, VLSI design, graphis/image processing, artificial intelligence, languages/compil
Author : Yoginder Singh Dandass
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (552 download)
Download or read book Generalizing List Scheduling for Stochastic Soft Real-time Parallel Applications written by Yoginder Singh Dandass and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced architecture processors provide features such as caches and branch prediction that result in improved, but variable, execution time of software. Hard real-time systems require tasks to complete within timing constraints. Consequently, hard real-time systems are typically designed conservatively through the use of tasks' worst-case execution times (WCET) in order to compute deterministic schedules that guarantee task's execution within giving time constraints. This use of pessimistic execution time assumptions provides real-time guarantees at the cost of decreased performance and resource utilization. In soft real-time systems, however, meeting deadlines is not an absolute requirement (i.e., missing a few deadlines does not severely degrade system performance or cause catastrophic failure). In such systems, a guaranteed minimum probability of completing by the deadline is sufficient. Therefore, there is considerable latitude in such systems for improving resource utilization and performance as compared with hard real-time systems, through the use of more realistic execution time assumptions. Given probability distribution functions (PDFs) representing tasks' execution time requirements, and tasks' communication and precedence requirements, represented as a directed acyclic graph (DAG), this dissertation proposes and investigates algorithms for constructing non-preemptive stochastic schedules. New PDF manipulation operators developed in this dissertation are used to compute tasks' start and completion time PDFs during schedule construction. PDFs of the schedules' completion times are also computed and used to systematically trade the probability of meeting end-to-end deadlines for schedule length and jitter in task completion times. Because of the NP-hard nature of the non-preemptive DAG scheduling problem, the new stochastic scheduling algorithms extend traditional heuristic list scheduling and genetic list scheduling algorithms for DAGs by using PDFs instead of fixed time values for task execution requirements. The stochastic scheduling algorithms also account for delays caused by communication contention, typically ignored in prior DAG scheduling research. Extensive experimental results are used to demonstrate the efficacy of the new algorithms in constructing stochastic schedules. Results also show that through the use of the techniques developed in this dissertation, the probability of meeting deadlines can be usefully traded for performance and jitter in soft real-time systems.
Author : Jacek Blazewicz
Publisher : Springer Science & Business Media
ISBN 13 : 3642790348
Total Pages : 321 pages
Book Rating : 4.6/5 (427 download)
Download or read book Scheduling in Computer and Manufacturing Systems written by Jacek Blazewicz and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical and application-oriented analysis of deterministic scheduling problems arising in computer and manufacturing environments. The important classical results are surveyed with particular attention paid to single-processor scheduling, along with general models such as resource-constrained scheduling, flexible flow shops, dynamic job shops, and special flexible manufacturing systems. Polynomial and exponential-time optimization algorithms as well as approximation and heuristic ones are presented using a Pascal-like notation, before being discussed in the light of particular problems. Basic concepts from scheduling theory and related fields are described to assist less advanced readers.
