If an operating system uses the FIFO page replacement algorithm and the main memory has only 3 frames, the number of page faults that will occur for the following sequence of page references is 4, 2, 5, 3, 2, 5, 4, 1, 3, 2, 4 Select one: 6 5 оо 8 7
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- Please DO NOT respond to this question by copy/pasting the code provided elsewhere on the site, none of those work. Thanks. Virtual Memory Lab This lab project addresses the implementation of page-replacement algorithms in a demand-paging system. Each process in a demand-paging system has a page table that contains a list of entries. For each logical page of the process, there is an entry in the table that indicates if the page is in memory. If the page is in memory, the memory frame number that page is resident in is indicated. Also, for each page, the time at which the page has arrived in memory, the time at which it has been last referenced, and the number of times the page has been referenced since the page arrived in memory are maintained. The page table data structure is a simple array of page-table entries (PTEs). Each PTE contains five fields as defined below: struct PTE { int is_valid; int frame_number; int arrival_timestamp; int…b) Given the following references string and page frames References string = 701243932107312 Page frames=5 i) Draw memory allocation using FIFO and Belady's Optimal algorithm.Develop a data type for a buffer in a text editor that implements the following API:public class BufferBuffer() create an empty buffervoid insert(char c) insert c at the cursor positionchar delete() delete and return the character at the cursorvoid left(int k) move the cursor k positions to the leftvoid right(int k) move the cursor k positions to the rightint size() number of characters in the bufferAPI for a text bufferHint : Use two stacks
- In a main memory-disk virtual storage system, the page size is 1KByte and the OPTIMAL algorithm is used for page replacements. A given program has been allocated three page frames in the main memory and it makes the following 16 memory references when it starts executing (the addresses are given in decimal):500, 2000, 2500, 800, 4000, 1000, 5500, 1500, 2800, 400, 5000, 700, 2100, 3500, 900, 2400 Fill in the contents of the three page frames after each memory reference in a table and calculate the hit ratio. Hint: denote by 'a' the page consisting of locations 0 through 1023 in memory. Similarly, b: 1024-2047, c: 2048-3071, d: 3072-4095, e: 4096-5119 and f: 5120-6143. Round to three decimal places.Cache Memory Caches depend on the locality principle – if you access memory locations near to each other, then you will get better performance because the cache will pull in a bunch of nearby locations every time you access main memory. Assume that multi-dimensional arrays in C are stored in “row major order”, that is, the elements in each row are stored together Example: int test[3][5] = { {1, 2, 3, 4, 5}, {6, 7, 8, 9, 10}, {11, 12, 13, 14, 15} } Would be laid out in memory like: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Which of these two programs fragments (a or b) should have better cache performance? You need only answer “a” or “b” – no explanation needed. // begin fragment a int big[100,1000]; for (i=0, i<100, i++) { for (j=0, j<999, j++) { big[i,j] += big[i,j+1]; } } // end fragment a // begin fragment b int big[100,1000]; for (j=0, j<999, j++) { for (i=0, i<100, i++) { big[i,j] += big[i,j+1]; } } // end fragment bAssume a system using paged virtual memory with a page size of 512. Physical memory in this system contains fewer than 512 frames. See the following two code examples: Example 1: int arr[512][512]; // Each row occupies exactly 1 page for (i = 0; i < 512; i++) { for (j = 0; j< 512; j++) { cout << arr[i]]; } Example 2: int arr[512][512]; // Each row occupies exactly 1 page for (i = 0; i< 512; i++) { for (j = 0; j< 512; j++) { cout << arr[j]0); } For each of these examples, give the number of page faults that will occur. Explain the reasoning for your answers. Use the editor to formot your answer
- 2. Use the Least Recently Used Page Replacement Algorithm allocate memory space for four pages. For this sequence: ABDBAEFCDFAEBCDAECFABFAIn C programming, write a method int ksyscall_proc_get_name(char *name). *Copies the current process name to the buffer provided * char *name - pointer to the buffer to copy the name. If there is an error return -1, if success return 0.Hide Assignment Information Instructions Programming Assignment One: This problem studies the effect of changing page sizes in a demand paging system. The following sequence of requests for program words is taken from a 460-word program: 10, 11, 104, 170, 73, 309, 185,245,246,434,458, and 364. Main memory can hold a total of 200 words for this program, and the page frame size will match the size of the pages into which the program has been divided. Calculate the page numbers according to the page size; divide by the page size, and the quotient gives the page number. The number of page frames in memory is the total number, 200, divided by the page size. For example, in problem (a) the page size is 100, which means that requests 10 and 11 are on Page 0, and requests 104 and 170 are on Page 1. Therefore, the number of page frames is two. a.) Find the success frequency for the request list using a FIFO replacement Algorithm and a page size of 100 words (there are two page…
- aton 24 Following is a mapping of Logical Memory to Physical Memory using a Page Table. You are required to fill the Page Table: yet vered Physienl Memery ced out of Logical Mumery Рage 0 Page 1 1 Page 5 2 Page 2 3 Page 4 ag question Рage 2 Page 3 Page 4 5 Page 0 6. 7 Page 1 8 Page 3 Page 5 Page Tablex86 assembly language Write a general-purpose program with loop and indexed addressing that adds 12h to 0th, 3rd , 7th , 11th ,15th ,19th , … elements of a DWORD array. For example, in array: Array1 DWORD 12h, 13h, 14h,15h, 16h, 17h, 18h, 19h, 1ah, 1bh, 1ch, 1dh, 1eh, 1fh becomes: Array1 : 24h, 13h, 14h, 27h,16h,17h,18h, 2bh, 1ah, 1bh, 1ch, 2f, 1eh, 1fh I did the following code buts it wrong. I need to do it without using no Lea, no HLT, and no RPT. How would I do that? .CODE LEA SI,ARRAY1MOV CX,4MOV AX,0ADD [SI],12HADD SI,0CHADD [SI],12H;repetition with indexed addressing modeRPT:ADD SI,10HADD [SI],12HLOOP RPTHLTVectors store a linear arrangement of values, accessed by a single index. Two-dimensional arrays store a tabular arrangement of values, accessed by two indexes, for example matrix[i][j], where i is the row index, and j is the column index. A common two-dimensional array that you should have seen early on in your education is a multiplication table. For example, here is the multiplication table up to 5 x 5: 1 2 3 4 5 1 1 2 3 4 5 2 2 4 6 8 10 3 3 6 9 12 15 4 4 8 12 16 20 5 5 10 15 20 25 Write a program that asks the user for the number of rows and columns for a multiplication table and prints out the corresponding results.