Lecture4 - 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 4 – Monday January 23 n Reading assignment: the class notes “Distributed systems-basic concepts” available online. n Phase 0 projects were due last Thursday!! n Last time ¨ 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. Lecture 4 2/16/12 2
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Today ¨ Names and fundamental abstractions ¨ Parallel systems n The speedup n Parallelism ¨ Bit-level parallelism ¨ Instruction-level parallelism ¨ Data parallelism ¨ Task-parallelism n Parallel architectures: SISD, SIMD, MIMD ¨ Distributed systems n Transparency (Access, Location, Concurrency, Replication, Failure, Performance, Scaling). n Communication in distributed systems Lecture 4 2/16/12 3
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Naming n Modularity along with abstraction, layering, and hierarchy allow a designer to cope with complexity; n Names and addresses  provide the means to connect modules.
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Lecture4 - COT 5611 Operating Systems Design Principles...

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