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Lecture3 - COT 5611 Operating Systems Design Principles...

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COT 5611 Operating Systems Design Principles Spring 2012 Dan C. Marinescu Office: HEC 304 Office hours: M-Wd 5:00-6:00 PM
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Lecture 3 – Wednesday January 18 n Reading assignment: class slides of Lectures 2 and 3 and the class notes “distributed systems-basic concepts” available online. n Last time 1. Man-made systems and the environment 2. Complex systems 1. Factors affecting complexity 2. Sources of complexity 3. Coping with complexity 1. Modularity 2. Abstractions 3. Hierarchy 4. Characteristics of complex systems 1. Propagation of effects 2. Incommensurate scaling 3. Tradeoffs 2/16/12 2 Lecture 3
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Today ¨ Computers as a distinct species of complex systems n Milestones in the evolution of computing and communication technology. n Factors affecting the complexity of computing and communication systems ¨ The software ¨ The exponential growth n Coping with complexity n Resource sharing and complexity n Scale-free systems or how nature deals with complexity. n Lessons learned. ¨ Names and fundamental abstractions Lecture 3 3 2/16/12
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Innovations are now full-circle M ICROPROCESSORS (1980s) MULTI-CORE M ICROPROCESSORS (2000s) WORLD WIDE WEB (1990s) GOOGLE , YouTube (2000s) FIBER OPTICS (1990s) WIRELESS (2000s) SENSORS DIGITAL CAMERAS (2000s) COLLECT PROCESS DISSEMINATE COMMUNICATE OPTICAL STORAGE HIGH DENSITY SOLID -STATE (1990s) SPINTRONICS (2000s) MILESTONES IN INFORMATION  PROCESSING BOOLEAN ALGEBRA (1854) DIGITAL COMPUTERS (1940s) INFORMATION THEORY (1948)  - Quantum Computing - Quantum Information Theory STORE 2/16/12 4 Lecture 3
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Factors affecting complexity of computing and communication systems Complexity of computing and communication systems New components New applications Interconnectivity + mobility, embedded devices Physical constraints Larger segment of population using the systems Optimization of resource consumption Timing Constraints 2/16/12 5 Lecture 3
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Analog, digital, and hybrid systems n Analog systems: ¨ the noise from individual components accumulate and ¨ the number of components is limited n Digital systems: ¨ are noise-free ¨ the number of components is not limited ¨ regeneration  restoration of digital signal levels ¨ static discipline the range of the analog values a device
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