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CS533 Concepts of Operating Systems Class 5

CS533 Concepts of Operating Systems Class 5. Event-Based Systems. Questions. Why does thread programming de-emphasize I/O? What do interactive applications, network services, and operating system kernels have in common? How does reactive programming relate to interrupt handling?

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CS533 Concepts of Operating Systems Class 5

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  1. CS533 Concepts of Operating SystemsClass 5 Event-Based Systems

  2. Questions • Why does thread programming de-emphasize I/O? • What do interactive applications, network services, and operating system kernels have in common? • How does reactive programming relate to interrupt handling? • Where is the boundary between interrupt handling and scheduled thread execution? • What are the implications of mixing these models? CS533 - Concepts of Operating Systems

  3. Questions • What is the problem with making resource allocation decisions statically? • What is the Slashdot effect? • Why is massive concurrency not a good match for multi-threading? • Is web service embarrassingly parallel? • What transparency is imposed by the thread-per request model? • Why does it hurt? • Why does the event handling model help? CS533 - Concepts of Operating Systems

  4. Questions • How can resources be scheduled in reactive programming? • What is the problem with event handlers blocking or performing long-lived computation? • What does it mean for a service to be “well conditioned”? CS533 - Concepts of Operating Systems

  5. Questions • What is a thread pool? • Why do the following techniques help during heavy load? • Thread pool resizing • Event batching • Adaptive load shedding • Why does pipeline parallelism scale well? • Thread per stage vs thread per request CS533 - Concepts of Operating Systems

  6. Questions • Do Ousterhout and Welsh contradict each other? • What is hard about programming threads? • What is easy about programming threads? • What is hard about programming events? • What is easy about programming events? CS533 - Concepts of Operating Systems

  7. Questions • What is the relationship between the event-loop model and reactive programming? CS533 - Concepts of Operating Systems

  8. Reminder • Class 6 presenters • Discuss your presentation plans with me ahead of time • Mail me the final version of your slides BEFORE the class CS533 - Concepts of Operating Systems

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