File systems Principles of Operating Systems Lecture 122 online filesystem is

File systems principles of operating systems lecture

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° File systems Principles of Operating Systems - Lecture 1 22 online filesystem is required for users to access data and code. ° Virtual memory ִ Job is swapped in and out of memory to disk.
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Personal Computing Systems ° Single user systems, portable. ° I/O devices - keyboards, mice, display screens, small printers. ° Laptops and palmtops, Smart cards, Wireless Principles of Operating Systems - Lecture 1 23 devices. ° Single user systems may not need advanced CPU utilization or protection features. ° Advantages: ִ user convenience, responsiveness, ubiquitous
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Parallel Systems ° Multiprocessor systems with more than one CPU in close communication. ° Improved Throughput, economical, increased reliability. Principles of Operating Systems - Lecture 1 24 ° Kinds: Vector and pipelined Symmetric and asymmetric multiprocessing Distributed memory vs. shared memory ° Programming models: Tightly coupled vs. loosely coupled ,message-based vs. shared variable
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Distributed Systems ° Distribute computation among many processors. ° Loosely coupled - no shared memory, various communication lines ° client/server architectures Principles of Operating Systems - Lecture 1 25 ° Advantages: resource sharing computation speed-up reliability communication - e.g. email ° Applications - digital libraries, digital multimedia
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Real-time systems ° Correct system function depends on timeliness ° Feedback/control loops ° Sensors and actuators ° Hard real-time systems - Principles of Operating Systems - Lecture 1 26 Failure if response time too long. Secondary storage is limited ° Soft real-time systems - Less accurate if response time is too long. Useful in applications such as multimedia, virtual reality.
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Summary of lecture ° What is an operating system? ° Early Operating Systems ° Simple Batch Systems ° Multiprogrammed Batch Systems Principles of Operating Systems - Lecture 1 27 ° Time-sharing Systems ° Personal Computer Systems ° Parallel and Distributed Systems ° Real-time Systems
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