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CGS 3763 Operating Systems Concepts Spring 2013

CGS 3763 Operating Systems Concepts Spring 2013. Dan C. Marinescu Office: HEC 304 Office hours: M- Wd 11:30 - 12:30 A M. Last time: Examples of client-server systems: Web Heterogeneous systems Remote Procedure call Today:

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CGS 3763 Operating Systems Concepts Spring 2013

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  1. CGS 3763 Operating Systems Concepts Spring 2013 Dan C. Marinescu Office: HEC 304 Office hours: M-Wd 11:30 - 12:30 AM

  2. Last time: Examples of client-server systems: Web Heterogeneous systems Remote Procedure call Today: Answers to student questions from last week’s lectures Threads Next time Reading assignments Chapter 4 of the textbook Chapters 4 textbook slides Lecture 17 – Friday, February 15, 2013 Lecture 17

  3. Questions from February 4th lecture • Which process is faster message passing or shared memory? • What are the advantages and disadvantages between message passing and shared memory? • More explanation on the Operating System Shell and C Shell. • What is the difference between child processes and threads? • More concepts on asynchronicity would help me better to analysis this topic. • How does interprocess communication come into play with the processes? • Are the fork and exec commands only in UNIX? Lecture 17

  4. Questions from February 6 lecture • More explanations of blocking and non-blocking messages. How does non-blocking increase optimization? • More explanations of Hourglass Architecture. • More on the idea of multiplexing and de-multiplexing. Does multiplexing and de-multiplexing compress data, or do something else? • Is peer-to-peer different that point-to-point communication? If so, what are advantages of each? • Are Sockets used in all network/internet communications or just some? • What are the benefits of using asynchronous communication instead of synchronous?And the opposite? Lecture 17

  5. Questions from February 8 lecture • Message buffering • Is IPV6 better than IPV4? If so, what makes it better? • What does the Data Link Layer consist of? • More example of how RPC’s differ from other procedure calls. • Are there any benefits to using encapsulation versus decapsulationmethods? Lecture 17

  6. Threads • Thread • the smallest sequence of programmed instructions that can be managed independently by an operating system scheduler • a light-weight process • multiple threads can share the same address space • On a single processor, multithreading generally occurs by time-division multiplexing, the processor switches between different threads. This context switching generally happens frequently enough that the user perceives the threads or tasks as running at the same time. • On a multiprocessor or a multi-core system the threads actually run at the same time, with each processor or core running a particular thread or task Lecture 17

  7. Single- and multi-threaded processes Lecture 17

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