ating Systems: Reference String: 7,6,8,2,6,3,6,4,2,3,6,3,2,8,2,6,8,7,6,8 How many page faults will occur if the pro
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Q 1
Theory and Fundamentals of
Reference String: 7,6,8,2,6,3,6,4,2,3,6,3,2,8,2,6,8,7,6,8
How many page faults will occur if the program has three page-frames available to it and use Optimal replacement?
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- 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.In a main memory-disk virtual storage system, the page size is 1KByte and the FIFO 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.A system uses 3 page frames for storing process pages in main memory. It usesthe page replacement policy where it replaces the page that has not been referred bythe CPU for the longest time . Assume that all the page frames are initially empty.What is the total number of page faults that will occur while processing the pagereference string given below4 , 7, 6, 1, 2,7, 6, 1, 2, 7, 2,4,7,1,6Also calculate the hit ratio , miss ratio, page faults, page fault rate.
- list: .word 3, 0, 1, 2, 6, -2, 4, 7, 3, 7 size: .word 10 Develop a mips code with a Mars simulator that reads this sequence and counts those <0 (negative) and >=0 (zero or positive) and prints what it finds to the screen.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 Table3:43 0.00 VOp :4G .l (66 KB/S LTED Job status Job Factory Job Contorler Job User auth Restart Сopy Scan Print Get job status Actor Database Draw a conceptual architecture for an application to control printers. These were the requirements: The software handle different jobs : • Print • Scan • Copy • Restart The printer can handle one job at a time, however, users still can send an order to execute jobs for the printer while it is running. The printer will handle the jobs sequentially based on job schedule details which are: 1. User can schedule a job to run now 2. User can set time to run job, like restart tomorrow at 12:00 3. Users can create a recurring Job which is set to automatically repeat based on the job schedule. Only authorized users should be able to submit a job. The user should be able to get a status or result for their job. The screen below shows the conceptual architecture. We created a job component that contains an interface called job and other operations that…
- If a program has 471 bytes and will be loaded into page frames of 126 byteseach. assuming the job begins loading at the first page (Page 0) in memory, andthe instruction to be used is at bvte 132. answer the following questionsa. How manv pages are needed to store the entire iob?b. Compute the page number and exact displacement for each of the byteaddresses where the desired data is stored.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 frames). b.) Find the success frequency for the request list using a FIFO…Suppose we have a computer system with 44-bit logical addresses, page size of 64KiB, and 4 bytes per page table entry. b. Suppose we use two-level paging and arrange for all page tables to fit into a single page frame. How will the bits of the address be divided up? (show your work) c. Suppose we have a program with a 4GiB address space. Counting the program and all page tables, using the two-level page table scheme from the previous question, how much memory, in number of page frames, is used? (show your work)
- 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, 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 and divide by the page size to get 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. 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 frames). b. Find the success frequency for the request list using a FIFO replacement algorithm and a page…Assume 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 answerA process references five pages A, B, C, D and E in the following order, A, C, B, E, A, B, E, A, B, C, D, E. Assume the replacement algorithm is first-in-first-out. Find the number of page transfers during this sequence of references starting with an empty main memory with three page frames. Repeat for four page frames.