December 2012
Beginner
944 pages
31h 42m
English
Content preview from Operating System Concepts, 9th Edition
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CHAPTER 17
Distributed Systems
A distributed system is a collection of processors that do not share memory or a clock. Instead, each node has its own local memory. The nodes communicate with one another through various networks, such as high-speed buses and the Internet. In this chapter, we discuss the general structure of distributed systems and the networks that interconnect them. We also contrast the main differences in operating-system design between these systems and centralized systems.
CHAPTER OBJECTIVES
- To provide a high-level overview of distributed systems and the networks that interconnect them.
- To describe the general structure of distributed operating systems.
- To explain general communication structure and communication protocols.
- To discuss issues concerning the design of distributed systems.
17.1 Advantages of Distributed Systems
A distributed system is a collection of loosely coupled nodes interconnected by a communication network. From the point of view of a specific node in a distributed system, the rest of the nodes and their respective resources are remote, whereas its own resources are local.
The nodes in a distributed system may vary in size and function. They may include small microprocessors, personal computers, and large general-purpose computer systems. These processors are referred to by a number of names, such as processors, sites, machines, and hosts, depending on the context in which they are mentioned. We mainly use site to indicate the location ...
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