Which of the following instructions should only be done by the kernel? Give explanation

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  • Set value of timer.
  • Read the clock.
  • Clear memory.
  • Issue a trap instruction.
  • Turn off traps.
  • Modify entries in device-status table.
  • Switch from user to kernel mode.
  • Access I/O device.

2. Describe the differences between symmetric and asymmetric multiprocessing. What are two advantages and one disadvantage of multiprocessor systems?

3. What are some advantages of peer-to-peer systems over client-server systems?

4. What is the purpose of the command interpreter? Why is it usually separate from the kernel?

5. What are the two models of interprocess communication? What are some strengths and weaknesses of the two approaches?