Operating System

Questions & Answers

This assignment includes two closely related (and reasonably short) papers, a landmark paper from Peter Denning describing working set theory and a paper from Carr and Hennessy on virtual memory management. Note that Hennessy is the other co-author of our Computer Architecture text. As usual, provide a summary and your reaction for each paper. Please refer back to the first couple of assignments and announcements for reaction expectations, this is a separate section of your report that is just as important as the summary. Peter Denning, "The Working Set Model for Program Behavior", Communications of the ACM, 1968. Richard Carr and John Hennessy, "WSClock -- A Simple and Effective Algorithm for Virtual Memory Management", Proceedings of the Symposium on Operating Systems Principles, 1981.


CECS 526 Assignment 5 Suppose a distributed system is implemented with the Raymond's tree-based algorithm for mutual exclusion, and the current tree configuration is shown below with Site B being the token holder. (Recall in the Raymond's tree structure, each node maintains a Holder variable to record its current parent node and a request queue Req.Q to record the sites where the requests the node has received from but not yet the token they are waiting for.)


English research about the differences between Android and iOS.


Problem 1.4 Background: Excel uses specific syntax to represent functions (such as those shown below) into an Excel workbook sheet. Problem: Input the below expressions into the indicated calculation tables and substitute x for the the values: -1, 0, 3, and A. What are the outputs from excel, are there any errors? If so, what do they mean? Cite any reference used. Example: f(x) = x + 1 Expression 1. f(x) = 2*+15 Expression 2. f(x) = x! Expression 3. f(x) = e-5x Expression 4. f(x) = log5 (x - 2)


Problem 1.3 Office hours will be offered every week with both the professor and the TAs. These will be scheduled avoiding student class conflicts to the degree possible. Go to the below when2meet link. Sign in using an arbitrary but unique 5 digit number as your name. Select the times that are not in conflict with your other classes or other regularly scheduled obligations. https://www.when2meet.com/?18345682-IYhV4 Indicate the number you used below. What was your number on When2Meet?


Problem 1.1 Install or otherwise gain access to one of the versions of Excel required for this class. Find the version information on the File/Account tab. Use your computer's screenshot function to take a screenshot of the Product Information. Insert the image on this worksheet.


What is a microkernel and what are over the advantages/disadvantages monolithic kernel?


This question is about space allocation method for files on a magnetic hard drive. a. Contiguous allocation is a way of allocate blocks to files. However, it can suffer from over or under estimation. Describe one problem that each will cause. . Another way of allocation is to used linked blocks. The slides suggest using FAT (file allocation table) to improve the performance. How can FAT improve the performance?


Consider using an SSD for storing student records a. Explain why updating student records can potentially take significant more time than adding new student records. b. All operating systems have buffers that store data to be written to the disk until a page of data is filled before writing to the disk (or until the OS explicitly force the buffer to be written). Name two reasons why using buffers are crucial in the case when appending new student records to the file.


(10 points) Consider the reader-writer problem. The following are two potential solution to the problem .Neither of them work. Explain why. a.Writer code the same as slide 71 of synchronization, reader code as follows: Reader code the same as slide 71 of synchronization, writer code as follows


5. (16 points) Consider deadlock avoidance with single resources. Assuming we have 4 process P1,P2, P3, P4. and 4 resources r1, r2, r3, r4. Consider all| 4 processes are writers (i.e. no resource scan be shared among processes). Suppose the processes are to acquire and release the release the resources in the following order (and assume the OS has the complete knowledge of the schedule beforehand) – we only show the first 8 requests. We also assume the following: if a request is denied, the process immediately quits and release all resources it is holding/waiting (if any). if a process have to wait for a resource (if another process is holding it), the avoidance algorithm can still grant the request and allow that process to wait all waiting queues for each resources are FIFO a.Draw the resource allocation graph before the first request is made b. Will the third request (P3 request r3) be granted? Explain your answer using the resource allocation graph. c. Is there any request after that one that will be denied? If so, show the first request that will be denied and explain why using the resource allocation graph. If not, show the request allocation graph at the of the 8-th request.


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