Download or read book Predictive Dynamic Load Balancing of Parallel Hash joins Over Heterogeneous Processors in the Presence of Data Skew written by Columbia University. Dept. of Computer Science and published by . This book was released on 1994 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "In this paper, we present new algorithms to balance the computation of parallel hash joins over heterogeneous processors in the presence of data skew and external loads. Heterogeneity in our model consists of disparate computing elements, as well as general purpose computing ensembles that are subject to external loading (e.g., a LAN connected workstation cluster). Data skew manifests itself as significant nonuniformities in the distribution of attribute values of underlying relations that are involved in a join. We develop cost models and predictive dynamic load balancing protocols to detect imbalance during the computation of a single large join. New predictive bucket scheduling algorithms are presented that smooth out the load over the entire ensemble by reallocating buckets whenever imbalance is detected. Our algorithms can account for imbalance due to data skew as well as heterogeneity in the computing environment. Significant performance gains are reported for a wide range of test cases on a prototype implementation of the system."

Download or read book Euro Par 2001 Parallel Processing written by Rizos Sakellariou and published by Springer. This book was released on 2003-06-30 with total page 993 pages. Available in PDF, EPUB and Kindle. Book excerpt: Euro-Par – the European Conference on Parallel Computing – is an international conference series dedicated to the promotion and advancement of all aspects of parallel computing. The major themes can be divided into the broad categories of hardware, software, algorithms, and applications for parallel computing. The objective of Euro-Par is to provide a forum within which to promote the dev- opment of parallel computing both as an industrial technique and an academic discipline, extending the frontiers of both the state of the art and the state of the practice. This is particularlyimportant at a time when parallel computing is undergoing strong and sustained development and experiencing real ind- trial take up. The main audience for and participants in Euro-Par are seen as researchers in academic departments, government laboratories, and industrial organisations. Euro-Par aims to become the primarychoice of such professionals for the presentation of new results in their speci?c areas. Euro-Par is also int- ested in applications that demonstrate the e?ectiveness of the main Euro-Par themes. Euro-Par has its own Internet domain with a permanent web site where the historyof the conference series is described: http://www. euro-par. org. The Euro-Par conference series is sponsored bythe Association of Computer Machineryand the International Federation of Information Processing. Euro-Par 2001 Euro-Par 2001 was organised bythe Universityof Manchester and UMIST.

Download or read book Proceedings of the International Conference on Parallel and Distributed Information Systems written by and published by . This book was released on 1994 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advances In Multimedia Databases For The New Century A Swiss japanese Perspective written by Yoshifumi Masunaga and published by World Scientific. This book was released on 2000-04-19 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Switzerland-Japan Joint Seminar on Multimedia and Databases was held to achieve at least three goals. First, it enabled us to present and discuss our recent research results and exchange our ideas for further promotion of science and technology. The second goal was to establish a friendly relationship between the Swiss and the Japanese. The last, but not least, aim was to disseminate information about our plans by publishing the proceedings of this seminar. We thought that publishing the outcome of the seminar would be essential in order not to store the treasure — the seminar results — secretly.

Download or read book Web Age Information Management written by Hongjun Lu and published by Springer. This book was released on 2003-06-29 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: Database research and development has been remarkably successful over the past three decades. Now the field is facing new challenges posted by the rapid advances of technology, especially the penetration of the Web and Internet into everyone's daily life. The economical and financial environment where database systems are used has been changing dramatically. In addition to being able to efficiently manage a large volume of operational data generated internally, the ability to manage data in cyberspace, extract relevant information, and discover knowledge to support decision making is critical to the success of any organization. In order to provide researchers and practitioners with a forum to share their experiences in tackling problems in managing and using data, information, and knowledge in the age of the Internet and Web, the First International Conference on Web-Age Information Management (WAIM 2000) was held in Shanghai, China, June 21-23. The inaugural conference in its series was well received. Researchers from 17 countries and regions, including Austria, Australia, Bahrain, Canada, China, France, Germany, Japan, Korea, Malaysia, The Netherlands, Poland, Singapore, Spain, Taiwan, UK, and USA submitted their recent work. Twenty-seven regular and 14 short papers contained in these proceedings were presented during the two-day conference. These papers cover a large spectrum of issues, from classical data management such as object-oriented modeling, spatial and temporal databases to recent hits like data mining, data warehousing, semi-structured data, and XML.

Download or read book EURO PAR written by and published by . This book was released on 2001 with total page 988 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Very Large Data Bases written by and published by . This book was released on 1999 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Web age Information Management written by and published by . This book was released on 2000 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the Twenty fifth International Conference on Very Large Databases Edinburgh Scotland UK 7 10 September 1999 written by Malcolm Atkinson and published by Morgan Kaufmann Publishers. This book was released on 1999 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the silver anniversary of one of the longest running database conferences. VLDB is among the best established forums for discussion in the international database community and is organized every year by the VLDB Endowment.

Download or read book Parallel Hash Join with Skew Handling on Multiprocessor Systems written by Walid R. Tout and published by . This book was released on 1993 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A New Dynamic Approach for Handling Data Skew Problems in Parallel Hash Join Computation written by Xiaofang Zhou and published by . This book was released on 1992 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: It assigns join subtasks to processors during runtime using a method based on the estimation of execution time required for the computation. Finally, we discuss briefly some further applications of our parallel hash join algorithm."

Download or read book Database Performance Tuning Handbook written by Jeff Dunham and published by McGraw-Hill Companies. This book was released on 1998 with total page 898 pages. Available in PDF, EPUB and Kindle. Book excerpt: Designed to support the senior applications programmer, technical support specialist, or database administrator with a strong working knowledge of multiple databases and programming languages.

Download or read book An Approximate Load Balancing Parallel Hash Join Algorithm to Handle Data Skew in a Parallel Data Base System written by Seong Geum and published by . This book was released on 1995 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A FRAMEWORK FOR SCALABLE DISTRIBUTED JOB PROCESSING WITH DYNAMIC LOAD BALANCING USING DECENTRALIZED APPROACH written by Dr P. SrinivasaRao and published by Lulu.com. This book was released on 2017-12-30 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: A distributed system consists of many heterogeneous processors with different processing power and all processors are interconnected with a communication channel. In such a system, if some processors are less loaded or idle and others are heavily loaded, the system performance will be reduced drastically. System performance can be improved by using proper load balancing [1, 4]. The aim of load balancing is to improve the performance measures and reduce the overall completion time and cost

Download or read book An Effective Algorithm for Parallelizing Hash Joins in the Presence of Data Skew written by International Business Machines Corporation. Research Division and published by . This book was released on 1990 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Predictive Dynamic Load Balancing of Parallel and Distributed Rule and Query Processing written by Columbia University. Dept. of Computer Science and published by . This book was released on 1994 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "Expert Databases are environments that support the processing of rule programs against a disk resident database. They occupy a position intermediate between active and deductive databases, with respect to the level of abstraction of the underlying rule language. The operational semantics of the rule language influences the problem solving strategy, while the architecture of the processing environment determines efficiency and scalability. In this paper, we present elements of the PARADISER architecture and its kernel rule language, PARULEL. The PARADISER environment provides support for parallel and distributed evaluation of rule programs, as well as static and dynamic load balancing protocols that predictively balance a computation at runtime. This combination of features results in a scalable database rule and complex query processing architecture. We validate our claims by analyzing the performance of the system for two realistic test cases. In particular, we show how the performance of a parallel implementation of transitive closure is significantly improved by predictive dynamic load balancing."

Download or read book Dynamic Load Balancing in Heterogeneous Distributed Environments written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Parallel and distributed architectures are emerging as commonplace platforms for high performance computing. The existence of standard parallel programming libraries facilitates the use of such platforms for running challenging applications in science or engineering. However, as compared to the homogeneous case, a number of additional factors should be taken into account in order to ensure an efficient execution on heterogeneous computing environments. In such systems one must consider not only the application's dynamic behavior but also the environment's dynamics. We dealt with the dynamic load balancing for parallel adaptive simulations in heterogeneous computing environments. Such applications are usually characterized by the fact that the workloads assigned to processors may change significantly and unpredictably. Our work followed two main directions. In a first step we developed a theoretical heterogeneous computational model and we extended and analyzed the well-known diffusion algorithms with respect to such a model. Afterwards, our variant of generalized diffusion was further compared with other approaches and was shown to be faster than another popular technique, the hydrodynamic algorithm. The possibility of using polynomial acceleration schemes in a dynamic context was further investigated. Other faster dynamic load balancing schemes were proposed and investigated. An incremental algorithm that is capable of taking advantage of an already computed fair distribution for computing a new one was described. In a second step, we designed and implemented a testbed for adaptive numerical simulations in heterogeneous computing environments. A tool, called HeRMeS, which allows to perform such simulations and that incorporates the methods developed at the first step, was designed and implemented. Experiments with the discussed methods and with HeRMeS were performed.