Fa99 midterm 2 - University of California Berkeley College...

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Page 1/12 University of California, Berkeley College of Engineering Computer Science Division – EECS Fall 1999 Anthony D. Joseph Midterm Exam #2 November 10, 1999 CS162 Operating Systems Your Name: SID: Circle the letters of your CS162 login (1 per line): a b c d e f g h i j k l m n o p q r s t u v w x y z a b c d e f g h i j k l m n o p q r s t u v w x y z TA Name / Section: This is a closed book examination. You have two hours to answer as many questions as possible. The number in parentheses at the beginning of each question indicates the number of points given to the question; there are 100 points in all. You should read all of the questions before starting the exam, as some of the questions are substantially more time consuming. Write all of your answers directly on this paper. Make your answers as concise as possible. If there is something in a question that you believe is open to interpretation, then please ask us about it! Good Luck!! Problem Possible Score 1 12 2 28 3 15 4 12 5 15 6 18 Total 100
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CS 162 Fall 1999 Midterm Exam #2 November 10, 1999 Page 2/12 1. (12 points total) True / False and Why . Circle the correct answer and provide a short reason for your answer: a. Doubling the block size in the UNIX 4.2 BSD file system will exactly double the maximum file size. True / False Why: b. A direct mapped cache can sometimes have a higher hit rate than a fully associative cache with an LRU replacement policy (on the same reference pattern). True / False Why: c. Virtual memory address translation is useful even if the total size of virtual memory (summed over all programs) is guaranteed to be smaller than physical memory. True / False Why:
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CS 162 Fall 1999 Midterm Exam #2 November 10, 1999 Page 3/12 2. (26 points total) File system buffer cache management. a. (12 points) Unix systems use a 30 second write-behind policy for file system data.
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