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CS345 02 - Computer Systems

CS345 02 - Computer Systems - CS 345 Computer System...

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CS 345 Computer System Overview Chapter 2
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BYU CS 345 Computer Systems 2 Topics to Cover… OS Objectives OS Services Resource Manager Evolution Achievements Processes Memory management Information protection and security Scheduling and resource management System architecture
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BYU CS 345 Computer Systems 3 Operating System Objectives Operating systems are among the most complex pieces of software ever developed Convenience Makes the computer more convenient to use Efficiency Allows computer system resources to be used in an efficient manner Ability to evolve Permit effective development, testing, and introduction of new system functions without interfering with service Objectives
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BYU CS 345 Computer Systems 4 Operating System Services Program development Editors, debuggers, frameworks Program execution Initialization, scheduling Access to I/O devices Uniform interface, hides details Controlled access to files Authorization, sharing, caching Services
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BYU CS 345 Computer Systems 5 OS Services System access Protection, authorization, resolve conflicts Error detection and response Hardware errors: memory error or device failure Software errors: arithmetic errors, access forbidden memory locations, allocation errors Accounting collect statistics (billing) monitor performance used to anticipate future enhancements Services
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BYU CS 345 Computer Systems 6 OS as a Resource Manager Set of computer programs executes as ordinary computer software The key difference is in the intent Directs use of resources Relinquishes control of the processor to execute other programs Built around kernel or nucleus Portion of OS that is in main memory Contains most-frequently used functions Resource Manger
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BYU CS 345 Computer Systems 7 Evolution of Operating Systems Operating systems have evolved because New types of hardware and hardware upgrades Development of new services and needs Fixes to OS faults Serial Processing Batch Processing Multi-programmed Systems Time-Sharing Systems Distributed Processing Systems ???? Evolution Personal Computing
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BYU CS 345 Computer Systems 8 Evolution of an OS? Must adapt to hardware upgrades and new types of hardware. Examples: Character vs. graphic terminals Introduction of paging hardware Must offer new services, e.g., internet support. The need to change the OS on regular basis place requirements on it’s design: modular construction with clean interfaces. object oriented methodology.
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BYU CS 345 Computer Systems 9 Evolution of Operating Systems Early Systems (1950) Simple Batch Systems (1960) Multiprogrammed Batch Systems (1970) Time-Sharing and Real-Time Systems (1970) Personal/Desktop Computers (1980) Multiprocessor Systems (1980) Networked/Distributed Systems (1980) Web-based Systems (1990)
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BYU CS 345 Computer Systems 10 Early Systems Structure Single user system.
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