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![Consider a disk pack with a seek time of
20 micros seconds and a rotational speed of
1000000 rotations per minute (RPM). It has
1200 sectors per track and each sector can
store 512 bytes of data. Consider a file stored in
the disk. The file contains 8000 sectors. Assume
that every sector access necessitates a seek,
and the average rotational latency for accessing
each sector is half of the time for one complete
rotation. The total time (in microseconds)
needed to read the entire file is](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fdb81185c-f92d-4770-8105-1cb0c8b073bb%2F94482cbe-7161-4561-9b33-327dcc69b008%2Fzxy970b_processed.jpeg&w=3840&q=75)
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- Consider a memory system which only allows you to do sequential search. For example a read/write tapedrive. If you want to look for a file you have to search sequentially looking at the first file, then the secondfile and so on until you find the file. A reasonable strategy would be place the most recently retrieved fileat the front (imagine that the tape system can magically do this). This way the files that are accessed moreoften will be ”at the front” and require less searching time in the long run. Consider the case with only 3files A, B, and C.1. Let Xn denote the sequence of the memory system after the nth search. For example, if the files wereordered A and then B followed by C, then X0 = ABC. Enumerate the state space.2. If X0 = ABC, list all possible states of X1.3. If pA, pB, and pC = 1 − pA − pB are the probabilities with which files A, B, and C are accessed,respectively, determine the one-step state transition matrix.4. If pA = 0.6, pB = 0.10, pC = 0.3, determine the steady…A disk has a capacity of two tera-byte size. Say the file system uses a multi-level inode structure for locating the data blocks of afile.The inode stores pointers to data blocks, including a single indirect block, a double indirect block, and several direct blocks in the 64 B of available space.Now, it is given that the disk has a block size of 512 B. The maximum file size that can be stored in such a file system in MB (round off upto 2 decimal places).RCS adopts a reverse delta approach for storing multiple versions of a file. For example, assume a file has three revisions, 1.1, 1.2, and 1.3, RCS stores the file as of version 1.3, then, the differences between 1.2 and 1.3, and the differences between 1.1 and 1.2. When a new version is created, say 1.4, the difference between 1.3 and 1.4 is computed and stored, and the 1.3 version is deleted and replaced by 1.4. Explain why RCS does not simply store the initial version (in this case 1.1) and the differences between each successive version.
- A file has r=30,000 EMPLOYEE records of fixed-length. Consider a disk with block size B=512 bytes. A block pointer is P=6 bytes long and a record pointer is P R =7 bytes long. Each record has the following fields: NAME (30 bytes), SSN (9 bytes), DEPARTMENTCODE (9 bytes), ADDRESS (40 bytes), PHONE (9 bytes), BIRTHDATE (8 bytes), SEX (1 byte), JOBCODE (4 bytes), SALARY (4 bytes, real number). An additional byte is used as a deletion marker. a) Calculate the record size R in bytes. b) Calculate the blocking factor bfr and the number of file blocks b assuming an unspanned organization. c) Suppose the file is ordered by the key field SSN and we want to construct a primary index on SSN. Calculate the index blocking factor bfr i.Please solve d,e and fConsider user accounts on a computer system with a Web server configured to provide user Web areas. In general, this uses a standard directory name, such as “public_html,” in a user’s home directory. However, access control needs to be properly set to allow users (with or without user accounts on the system) to browse the webpages. Assuming there are one main page (index.html), two pictures files (a.jpg and b.jpg) stored in an sub-directory (Image) and one pdf file (c.pdf) stored in an sub-directory (Doc), all under the public_html. Specify the access control for each directory and files that allows everyone to view the webpage.
- Consider user accounts on a computer system with a Web server configured to provide user Web areas. In general, this uses a standard directory name, such as “public_html,” in a user’s home directory. However, access control needs to be properly set to allow users (with or without user accounts on the system) to browse the webpages. Assuming there are one main page (index.html), two pictures files (a.jpg and b.jpg) stored in an sub-directory (Image) and one pdf file (c.pdf) stored in an sub-directory (Doc), all under the public_html. (a) Specify the access matrix for each directory (excluding home directory) and files that allows everyone to view the webpage. (b) Draw a directed graph that represented to the access matrixImplement c/c++ to evaluate round robin algorithm with i/o burst.I want my code to able to read csv. The link is to my csv file https://jpst.it/2IURz. The code must also have input for quantum time. The code must contain this following:(i) Turnaround time of the jobs;(ii) Waiting time of the jobs; and(iii) Number of interrupts incurredConsider a computer system with three users: Alice, Bob, and Cyndy. Alice owns the file alicerc, and Bob and Cyndy can read it. Cyndy can read and write the file bobrc, which Bob owns, but Alice can only read it. Only Cyndy can read and write the file cyndyrc, which she owns. Assume that the owner of each of these files can execute it. Create the corresponding access control matrix. Cyndy gives Alice permission to read cyndyrc, and Alice removes Bob's ability to read alicerc. Show the new access control matrix
- The Harvard robotics club has organized a Robothon. n robots are placed alongthe edge of a circular area at the middle of the OAT(open air theatre). Each robot will move along arbitrary tracksinside the circle while leaving behind a heat signature along its trail. However, they have beenprogrammed not to cross their own trail or the trail of another robot, neither will they ever moveout of the circle. In case a pair of robots i and j meet at any point, they are removed from the sceneand the club will pay a reward sum of M[i, j] to the owners of these robots. Note that some robotscan keep moving infinitely without ever meeting another one. Given the reward matrix M whereM[i, j] = M[j, i], design a polynomial time algorithm that determines the maximum money theclub might potentially end up spending. For this particular problem, give a very brief justificationof the recurrence. Give pseudo-code for a dynamic program which solves the recurrence efficiently Youdo not need to prove…On the Christmas eve, Santa Claus will start working to deliver gifts to the lovely kids. Different from previous years that he secretly delivered the gifts, this year, he indeed wants to openly deliver the gifts to the kids and wish them a merry Christmas when delivering the gifts. However, the kids each have very different sleep schedules. Kid i is awake only in a single closed time interval [ai, bi]. Santa doesn’t want to disturb the sleeping kids, so each time he will find an awake kid, give the gift to the kid, wish the kid a merry Christmas, and talk with the kid until he/she falls asleep. However, Santa does want to meet and talk with as many kids as possible. Design a greedy algorithm which takes as input the number of kids n, and the n lists of intervals [ai, bi], and outputs the maximum number of kids m that Santa can talk to. You are expected to write the pseudocode of your algorithm.You are organizing a conference that has received n submitted papers. Your goal is to get people to review as many of them as possible. To do this, you have enlisted the help of k reviewers. Each reviewer i has a cost sij for writing a review for paper j. The strategy of each reviewer i is to select a subset of papers to write a review for. They can select any subset S; C {1,2, ..., n}, as long as the total cost to write all reviews is less than T (the time before the deadline): 2 Sij 1. (b) Show that for B = 2 this fraction is close to 1/3. [Hint: You can consider an instance with 3n + 1 papers and only n will be reviewed.]
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