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Andrew S. Tanenbaum (OS) Edition 4 Exercise 3 Question 49 (Page No. 260)
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Virtual memory provides a mechanism for isolating one process from another. What memory management difficulties would be involved in allowing two operating systems to run concurrently? How might these difficulties be addressed?
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Andrew S. Tanenbaum (OS) Edition 4 Exercise 3 Question 48 (Page No. 260)
Can you think of any situations where supporting virtual memory would be a bad idea, and what would be gained by not having to support virtual memory? Explain.
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Andrew S. Tanenbaum (OS) Edition 4 Exercise 3 Question 52 (Page No. 260 - 261)
Write a program that simulates a toy paging system that uses the $\text{WSClock}$ algorithm. The system is a toy in that we will assume there are no write references (not very realistic), and process ... references. Explain what is needed to extend the program to handle a page reference stream that also includes writes.
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Andrew S. Tanenbaum (OS) Edition 4 Exercise 3 Question 51 (Page No. 260)
Write a program that simulates a paging system using the aging algorithm. The number of page frames is a parameter. The sequence of page references should be read from a file. For a given input file, plot the number of page faults per $1000$ memory references as a function of the number of page frames available.
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Andrew S. Tanenbaum (OS) Edition 4 Exercise 3 Question 50 (Page No. 260)
Plot a histogram and calculate the mean and median of the sizes of executable binary files on a computer to which you have access. On a Windows system, look at all .exe and .dll files; on a UNIX system look at ... of a page table entry. Assume that all programs are equally likely to be run and thus should be weighted equally.
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