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InClassActivity19-sol - Activity#19(Solution 5:31 AM...

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ECSE-2660 Computer Architecture, Networks, & Operating Systems, Spring 2003 Page 1 of 2 Activity #19 (Solution) 4/1/2003 5:31 AM Activity 19.1 OS Structure, System Calls 1. (5 points) What is the main advantage of layered approach to OS design? The main advantage of the layered approach is modularity . By selecting the layers so that they only use functions and services of the lower-level layers we can simplify debugging and system verification. Grading: 1pt for trying, +3pts for pointing out “modularity”, +1pt for articulate explanation. 2. (5 points) List two disadvantages of layered approach to OS design? - Each layer carries some overhead, so the OS may become slow. - Deciding the order in which layers are defined is a hard problem. So the design itself is difficult. Read Section 3.5.2 of your textbook. Grading: 1pt for trying, +2pts for each correct item. 3. (10 points) What are the main advantages for an operating system designer of using a virtual machine architecture? - Complete protection of various system resources - Can research and develop new OS concepts without affecting current users. For instance, a bug in an experimental kernel will not destroy a user’s programs/files, and does not incur system downtime.
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