Operating Systems Assignment 1

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Submitted By virus2001y
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Pages 3
General:
1. What devices do you own with operating systems (smartphones, tablets, computers). For each (up to 3): (5 points)
a. What OS does it run? What version? What is the update mechanism?
Answer) my computer OS is windows 8 and my smartphone OS is IOS 7. Windows update mechanism is Windows Updates and IOS update mechanism is ITunes.
Chapter 2
2. What is the main advantage for an operating-system designer of using a virtual-machine architecture? What is the main advantage for a user? (10 points)
Answer) OS designers can solve debug, network problem and security problem easily.
Users also can undergo many different OS on one physical system. It is easy to research and develop.

Chapter 3
3. Discuss three major complications concurrent processing adds to an OS. (10 points)
Answer) 1. Processes and system resources should protected from each other. 2. More than one process executing concurrently for protect performance degradation 3. It occurs deadlocks. So you can m

Chapter 4:
4. Provide a programming example where multithreading does not provide better performance than a single-threaded solution. (5 points)
Answer) Sequential program is not good at threaded. So example is Shell program.

5. Can a multithreaded solution using multiple user-level threads achieve better performance on a multiprocessor system than on a single-processor system? How does this change if kernel-level threads are used? Explain. (10 points)
Answer) multiple user-level threads cannot make different processors in multiprocessor system at the same time. So, it shows lower performance. But If change kernel-level threads, it can make different processors at the same time. It is good at multiprocessor system

Chapter 5 complications
6. Discuss how the following pairs of scheduling criteria conflict in certain settings. (15 points)
a.…...

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