mid01 - Prof.Schwan YOURNAME Closedbook,closednotes...

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CS 6420 ‐ Midterm ‐ Winter 1999 Prof. Schwan YOUR NAME: Closed book, closed notes. 1) Short questions: 25 mins. (Questions marked with * have more weight) a. By giving some concrete examples of OS functionality, explain the difference between monolithic kernels and microkernels. b. Define ‘Events’ in SPIN, describe why they are important, and how/why their performance is important to that of the SPIN kernel itself. c. Contrast the notion of ‘strand’ in SPIN with that of ‘Processor Context’ in the Aegis operating system built on Exokernel. d. The Microkernel paper by Liedtke describes a number of specific techniques for specific machines to turn what are thought of as expensive kernel operations’ into cheap ones. Examples include address space switches, thread switches and IPC, on Pentium or PowerPC processors. Describe at least one such technique in some detail. e. Try your best to argue that the Cache Affinity’ model’s assumptions are inappropriate, for the target machines addressed by this paper.
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  • Fall '08
  • Staff
  • monolithic kernel, Microkernel, scheduler
 activation, Prof.
Schwan, scheduler
 activation
 abstraction, ‘expensive
 kernel
 operations

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