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Introduction to Distributed Systems

11 CSE 380 Computer Operating SystemsInstructor: Insup LeeUniversity of PennsylvaniaFall 2003 Lecture Note: Distributed Systems2 Introduction to Distributed Systems Why do we develop Distributed Systems ? availability of powerful yet cheap microprocessors (PCs,workstations), continuing advances in communication technology, What is a Distributed system? A Distributed system is a collection of independent computers thatappear to the users of the system as a single system. Examples: Network of workstations Distributed manufacturing system ( , automated assembly line) Network of branch office computers3 Distributed SystemsComparison of three kinds of multiple CPU systems4 Advantages of Distributed Systemsover Centralized Systems Economics: a collection of microprocessors offer a betterprice/performance than mainframes.

Advantages of Distributed Systems over Centralized Systems • Economics: a collection of microprocessors offer a better price/performance than mainframes. Low price/performance ratio: cost effective way to increase computing power. • Speed: a distributed system may have more total computing power than a mainframe.

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