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1 TEUBNER-TEXTE zur Informatik Band 24 T. Schnekenburger/G. Stellner (Hrsg.) Dynamic Load Distribution for Parallel Applications

2 TEUBNER-TEXTE zur Informatik Herausgegeben von Prof. Dr. Johannes Buchmann, Darmstadt Prof. Dr. Udo Lipeck, Hannover Prof. Dr. Franz J. Rammig, Paderborn Prof. Dr. Gerd Wechsung, Jena Ais relativ junge Wissenschaft lebt die Informatik ganz wesentlich von aktuellen Beitragen. Viele Ideen und Konzepte werden in Originalarbeiten, Vorlesungsskripten und Konferenzberichten behandelt und sind damit nur einem eingeschrankten Leserkreis zuganglich. Lehrbucher stehen zwar zur Verfugung, konnen aber wegen der schnellen Entwicklung der Wissenschaft oft nicht den neuesten Stand wiedergeben. Die Reihe nteubner-texte zur Informatik" soli ein Forum fur Einzel- und Sammelbeitrage zu aktuellen Themen aus dem gesamten Bereich der Informatik sein. Gedacht ist dabei insbesondere an herausragende Dissertationen und Habilitationsschriften, spezielle Vorlesungsskripten sowie wissenschaftlich aufbereitete AbschluBberichte bedeutender Forschungsprojekte. Auf eine verstandliche Darstellung der theoretischen Fundierung und der Perspektiven fur Anwendungen wird besonderer Wert gelegt. Das Programm der Reihe reicht von klassischen Themen aus neuen Blickwinkeln bis hin zur Beschreibung neuartiger, noch nicht etablierter Verfahrensansatze. Dabei werden bewubt eine gewisse Vorlaufigkeit und Unvollstandigkeit der Stoffauswahl und Darstellung in Kauf genom men, weil so die Lebendigkeit und Originalitat von Vorlesungen und Forschungsseminaren beibehalten und weitergehende Studien angeregt und erleichtert werden konnen. TEUBNER-TEXTE erscheinen in deutscher oder englischer Sprache.

3 Dynamic Load Distribution for Parallel Applications Edited by Dr. Thomas Schnekenburger Dr. Georg Stellner Technische Universitat Munchen Springer Fachmedien Wiesbaden GmbH 1997

4 Dr. Thomas Schnekenburger Born 1964 in Villingen. Studies at the University of Stuttgart from 1984 to Received diploma in 1989 from the University of Stuttgart. Research assistant at the Technische Universitat Manchen from 1990 to Received Ph.D. in 1994 from the Technische Universitat Manchen. Project scientist at Siemens AG, Corporate Technology (ZT), Dept. Software beginning in Dr. Georg Stellner Born 1966 in Augsburg. Studied computer science at the Technische Universitat Manchen from 1986 to Received diploma in computer science in Researcher at the Technische Universitat Manchen from 1992 to Received Ph.D. from the Technische Universitat Manchen in Research interests: Distributed and parallel programming environments, checkpointing and load balancing methods. Gedruckt auf chlorfrei gebleichtem Papier. Die Deutsche Bibliothek - CIP-Einheitsaufnahme Schnekenburger, Thomas: Dynamic load distribution for parallel applications 1 SchnekenburgerlSteliner. - Stuttgart; Leipzig: Teubner, 1997 (Teubner-Texte zur Informatik; Bd. 24) ISBN ISBN (ebook) DOI / Das Werk einschlieblich aller seiner Teile ist urheberrechtlich geschotzt. Jade Verwertung auberhalb der engen Grenzen des Urheberrechtsgesetzes ist ohne Zustimmung des Verlages unzul1issig und strafbar. Das gilt besonders for VervielfAltigungen, Obersetzungen, Mikroverfilmungen und die Einspeicherung und Verarbeitung in elektronischen Systemen. Springer Fachmedien Wiesbaden 1997 Ursprünglich erschienen bei B.G. Teubner Verlagsgesellschaft Leipzig 1997 Umschlaggestaltung: E. Kretschmer, Leipzig

5 Preface Dynamic load distribution for parallel applications is one of the most important topics of research in the area of parallel and distributed systems. The German Science Foundation has been supporting research in this area by funding SFB 342 "Methods and Tools for the efficient Use of Parallel Systems" and GK "Cooperation and Resource-Management in Distributed Systems" since 1990 and 1995 respectively. This manuscript is the result of research in both projects done jointly in the department for informatics and electrical engineering of Technische Universitlit Munchen as well as by the industrial partner Corporate Research of Siemens AG, Munich. First, surveys and classifications of existing models and implementations are given. Based on this comprehensive framework, several systems for checkpointing, a distributed thread kernel, load distribution in large workstation networks, and adaptive load distribution systems have been implemented and tested. The structure and results obtained with such systems are also covered. Finally a middleware - based architecture and three application areas are used to test the systems described beforehand. Understanding the needs of large distributed applications and the efficient use of heterogenous networked resources is most important to make good use of the distributed computing power as it is available worldwide in the internet and also on a private basis in intranets. This manuscript will help the reader to understand the questions and can serve as a basis for future research and development as well as in training for distributed applications. Thanks to the editors of Teubner Verlag for their support, for the editors Thomas Schnekenburger and Georg Stellner, to the authors of the different chapters and the many colleagues of SFB 342 and Graduiertenkolleg, that have contributed to this manuscript. Munich, Arndt Bode Head of SFB 342

6 Contents 1 Introduction References. 2 Surveys and Classifications 2.1 General Classification of Load Distribution Objectives Integration Level Structure Entities and Targets Classification... References Classification and Survey of Strategies Classification of Load Distribution Strategies A Survey of Load Distribution Strategies in Examples References Classification of Load Models Introduction Load Models and Load Indices Classification of Load Models Summary... References Migration Mechanisms A Taxonomy for Migration Mechanisms Examples of Migration Mechanisms... References Exemplary Load Distribution Concepts: A Classification System Based Load Distribution Domain Specific Load Distribution Run-Time Environments for Load Distribution References. 3 Systems 3.1 Consistent Checkpointing Outline of the Algorithm of CoCheck Implementation of CoCheck for MPI Automatic Load Distribution with CoCheck for tumpi Performance Experiments Conclusion and Future Work References Load Distribution Strategies of the Distributed Thread Kernel DTK Introduction DTK Basics General Classification

7 8 CONTENTS Random OptimalLocal Load RBidding SBidding Comparison of DTK's strategies Related Work Conclusion & Future Work... References Economic-Based Dynamic Load Distribution In Large Workstation Networks Introduction Concepts and Design of Dynasty Performance Evaluation Classification Conclusions Future Work References ALDY - an Adaptive Load Distribution System Introduction Concepts and Design Example Related Work Classification Conclusion and Future Work.. References. 4 Applications 4.1 A Middleware-Based Architecture for Load Management Introduction IDL Technology Target Application Monitoring Strategy Load Management Mechanisms Architecture of an IDL-based Load Balancer Next Steps Classification.... References Cooperative Parallel Automated Theorem Proving Introduction Cooperative Theorem Proving SPTHEO and CPTHEO - two applications Classification Conclusions References Automatic Test Pattern Generation Parallel Test Pattern Generation i

8 CONTENTS Fault Parallelism Search Space Parallelism Summarizing the load balancing mechanisms 157 References MpSIM - Parallel Event Driven Simulation of Logic Circuits by Time Warp Parallel Discrete Event Simulation (PDES) Load Balancing within MpSIM Classification Tables 168 References Summary 171 About the Authors 173

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