Lecture5 - 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 5 – Wednesday January 25 n Reading assignment: the class notes “Distributed systems-basic concepts” available online. n Last time ¨ 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 ¨ Storage systems n Atomicity n Why it is hard to implement atomicity Lecture 5 2/16/12 2
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Today ¨ Distributed systems n Middleware: ¨ Transparency (Access, Location, Concurrency, Replication, Failure, Performance, Scaling). n Motivating example  molecular dynamics computation n Communication in distributed systems ¨ Abstractions: process, thread, communication channel ¨ The state of a process ¨ Events: internal, communication ¨ Process history ¨ Space time diagrams ¨ Global state Lecture 5 2/16/12 3
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Desirable properties of middleware n Access transparency - local and remote information objects are accessed using identical operations; n Location transparency -information objects are accessed without knowledge
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This note was uploaded on 02/15/2012 for the course COP 5611 taught by Professor Staff during the Spring '08 term at University of Central Florida.

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Lecture5 - COT 5611 Operating Systems Design Principles...

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