Given the assumptions above and the page table below, translate the following virtualaddresses (expressed as base ten integers) to physical addresses (also base tenintegers). If the corresponding page is not resident in memory (NR), indicate a pagefault.2.Hint: rather than translating these values to binary or hexadecimal, you can use thefollowing formulas:= virtualAddress/pageSize] where x is x rounded down to theрageNumnearest integeroffsetdividing x by y.= virtualAddress mod pageSize where x mod y is the remainder afterphysicalAddress frameNum x pageSize offset.Show your work (a) VA 0PageFrame #03(b) VA 40951NR(c) VA 409622(d) VA 100004NR(e) VA 200005NR(f) VA 3000017NRO NLn ON

Assuming the page size to be 4KB. The calculations for physical addresses are given below: (a) VA =…

Answered: Given the assumptions above and the…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Suppose a disk has N cylinders, numbered from 0 to P. At some time, the disk arm is at cylinder X, and there is a queue of disk access requests for cylinders R1, R2, R3, R4. Explain which Disk scheduling algorithm should be the best to be used between the following a) FIFO b) CSCAN c) SSTF d) FSCAN e) CLOOK N: B • • Choose any acceptable numeric numbers for N, P, X, R1, R2, R3 and R4 • • Plagiarism Will be penalized heavily
Which of the following cache replacement algorithm that replaces the block in the set that has been in the cache longest with no reference to it? a. LRU b. FIFO c. LIFO d. LFU
Consider the following code snippet in C: char *base_url = malloc(11 * sizeof(char)); printf("Enter an 11 character URL: "); scanf("%s", base_url); char src[11]; char dst[11]; // copies base_url to src strncpy(src, base_url, 11); // copies src to dest strcpy(dst, src); printf("src: %s dst: %s\n", src, dst); Identify at least one potential buffer overflow vulnerability and explain why/how it can be exploited (i.e., not just that it’s a buffer overflow, but where the problem will manifest itself).
One problem with page-mapped FTLs is that they make the mapping tables too large Assume you have a page-mapped FTL. If each entry in the FTL takes 4 bytes (assuming it is an array), how large is the FTL? Assume the SSD is only 1 MB in size, and uses 1 KB pages. a) 1 KBb) 4 KBc) 1 MBd) 4 MBe) None of the above A basic file systems, assume a simple disk model where each disk read of a block takes D time units. Also assume the basic layout is quite like the very simple file system or (vsfs). 1. Assume that all data and metadata begin on disk. Assume further that all inodes are in separate blocks, and that each directory is only one block in size. How long (in term of D time units) does it take to open the file /a/b/c/d.txt? 2. Assume after opening the file, we read the file in its entirety. It is a big file, containing 1036 blocks. The inode itself has room for 12 direct pointers and 1 indirect pointer. Disk addresses are 4 bytes long, and disk blocks are 4KB in size. After opening…
Consider the following main memory word reference string; start with an empty cache all block initially marked as not valid Using Spatial Locality: 1 3 5 1 0 7 2 4 1 3 Find the number of requests? Find number of Hits? Find number of Misses? Please explain in details and fast!Thanks
In the event that each page is 1 KB in size, what are the page numbers and offsets (please supply them as decimal integers) for the following address references? (please provide the proper page numbers and offsets, as well as the stages of the computation)a. 2562 b. 23563 c. 11500
) Consider the following sequence of virtual memory references (in decimal) generatedby a single program in a pure paging system:100, 110, 1400, 1700, 703, 3090, 1850, 2405, 2460, 4304, 4580, 3640a. Derive the corresponding reference string of pages (i.e. the pages the virtual addressesare located on), assuming a page size of 1024 bytes. (Assume that page numberingstarts at 0)b. For the page sequence derived above, determine the number of page faults for each ofthe following page replacement strategies, assuming that two (2) page frames areavailable to the program.i. LRUii. FIFOiii. OPT (Optimal)
Which fields inside an entry in a log file will be made available to be processed by the log processing function that has been specified? The following piece of code causes an average of how many cache misses per entry, assuming that cache blocks are 64 bytes in size and that no prefetching is performed.
QUESTION 1: Explain the differences between Simple Paging and Virtual Memory paging, QUESTION 2: What is the difference between a Page and a Frame? QUESTION 3: Explain the differences between Resident Set Management and Page Replacement Policy.
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The heart of the recent hit game SimAquarium is a tight loopthat calculates the average position of 256 algae. You areevaluating its cache performance on a machine with a 1,024-byte direct-mapped data cache with 16-byte blocks (B = 16).You are given the following definitions:1 struct algae_position {2 int x;3 int y;4 };56 struct algae_position grid[16][16];7 int total_x = 0, total_y = 0;8 int i, j;You should also assume the following:sizeof(int) = 4.grid begins at memory address 0.The cache is initially empty.The only memory accesses are to the entries of the arraygrid. Variables i, j, total_x , and total_y are storedin registers.Determine the cache performance for the following code:1 for (i = 0; i < 16; i++) {2 for (j = 0; j < 16; j++) {3 total_x += grid[i][j].x;4 }5 }67 for (i = 0; i < 16; i++) {8 for (j = 0; j < 16; j++) {9 total_y += grid[i][j].y;10 }11 }A. What is the total number of reads?B. What is the total number of reads that miss in thecache?C. What is the miss…
Consider the following code snippet: .datamyArray word 01F2h, 1111h, 0ABDh, AAAAh.codemov ebx, offset myArrayadd ebx, 2 What is the value at the memory location ebx is pointing to? In other words, what value is referenced by [ebx]? Group of answer choices 1111 AAAA 0ABD 01F2

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