POPCORN -- A Paradigm for Global-Computing爆米花——全球计算范式.docVIP

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POPCORN -- A Paradigm for Global-Computing爆米花——全球计算范式.doc

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POPCORN – A Paradigm for Global-Computing A thesis submitted in partial fulfillment Of requirements for the degree of Master of Science in Computer Science by Shmulik London supervised by Prof. Noam Nisan Institute of Computer Science The Hebrew University of Jerusalem Jerusalem, Israel June, 1998 Acknowledgments I would like to thank my advisor, Prof. Noam Nisan for his great help and for sharing the enthusiasm of carrying out this project. I would also like to thank Ori Regev who have been an excellent companion for building the Popcorn System. Together they have made this project very enjoyable. I Thank Rivki Yagodnik and Gil Shafran for trusting our system and writing applications for it as part of their lab projects. Abstract Global Computing (GLC) refers to the idea of carrying out concurrent computations on a worldwide scale. GLC is inspired by the possibility of using the Internet as a platform for distributed computing. While it is unlikely that GLC will replace other forms of High Performance Computing, it has already been proven useful for some problems, which are beyond the capabilities of conventional systems [1][2]. There are several fundamental differences between the Internet and local distributed-computing environments. These differences reflect on the design of applications for GLC and call for a new programming paradigm. The Popcorn System [3][4], is an attempt to supply an infrastructure for general GLC applications. This work is concerned with the Popcorn programming paradigm, which was designed for the Popcorn System. We discuss the considerations taken in designing a paradigm for GLC, describe our resulting basic paradigm and give many extensions to it. We also discuss the design of representative applications under this paradigm and conclude with the implementation of an efficient Game-Tree Evaluation application in Popcorn. Contents Chapter 1 introduction 6 1.1. Global Computing 6 1.1.1. The Idea of Global Computing 6 1.1.2. The Vis