Assignment 2 Page Replacement A computer has four page frames. The time of loading, time of last access, and the R and M bits for each page are as shown below (the times are in clock ticks): Page Loaded Last ref. RM 126 279 230 260 10 120 272 11 3. 160 280 11 1. Which page will NRU replace? 2. Which page will FIF0 replace? 3. Which page will LRU replace? 4. Which page will second chance replace?

Assignment 2 Page Replacement A computer has four page frames. The time of loading, time of last access, and the R and M bits for each page are as shown below (the times are in clock ticks): Page Loaded Last ref. RM 126 279 230 260 10 120 272 11 3. 160 280 11 1. Which page will NRU replace? 2. Which page will FIF0 replace? 3. Which page will LRU replace? 4. Which page will second chance replace?

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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A process refers to 5 pages, A, B, C, D, E in the order : A, B, C, D, A, B, E, A, B, C, D, E. If the page replacement algorithm is FIFO, the number of page transfers with an empty internal store of 3 frames is : Select one: a.9 b.10 c.8 d.7
Using the following page replacement algorithms, determine the number of faults in the following reference string given a physical memory size of 4 frames: 5 6 5 4 4 4 8 2 9 9 0 4 5 3 9 6 8 1 9 1 6 1 0 0 5 OPT. 3 frames
I'm bit confused on how paging allocation in this case. How would we know what the Best, worst, first, next page allocation would be for each of the requests? Assume the bolded USED* is the start for worst, first and next.
Write a program that implements the FIFO and LRU page-replacement algorithms presented in this chapter. First, generate a random page reference string to each algorithm, and record the number of page faults incurred by each algorithm. Implement the replacement algorithms so that the number of page frames can vary from 1 to 7. Assume that demand paging is used.
let the size of a finite buffer be 10 messages and variable N representing the number of messages currently available in the buffer i) how many semaphores are needed to execute multiple procedures and consumers concurrently and explain why? ii) if N=5 what will happen to a consumer upon a semawait() call iii) if N=10 what will happen to a consumer upon a semawait() call iv) if N=0 will you allow the consumer to access the buffer? What will happen if you fail to block the consumer? v) When you should allow any producer to access the buffer and why
Consider the following page address stream: 2 1 4 3 5 3 2 4 5 2 1 2 4 3 1 Which of the following causes the most page faults to occur on a machine with 3 frames? Scheme that causes the most faults: a) First in First out b) LRU and FIFO are the same number of faults c) FIFO and Opitimal are the same number of faults d) All have the same number of faults e) Least Recently Used f) No faults occurs g) LRU and Optimal are the same number of faults h) Optimal NUMBER OF FAULTS CAUSED: a)
This is what my professor said: Items are 4 bytes, pages are 2k, so ~512 items fit on a page. Even if we start in the beginning of a page, the first access will be a miss followed by ~200 hits, then a TLB miss followed by ~500 hits, so the hit rate is ~100%5. Page size 512 means 9 bits of offset and 7 bits of VPN. The offset is just the decimal version of 1 0111 0111 [unsigned] which is 375The offset is 0011 100 which is 28. Is he correct?
Consider the following page reference string: 3 1 4 1 5 9 2 6 5 3 5 Assuming demand paging with three frames, how many page faults would occur for the following replacement algorithms? Least recently used replacement First-in-first-out replacement
There are 5 page frames and 8 pages (numbered 0; 1; : : : ; 7). Assume that all frames are initially empty. The reference sequence is the following:7 1 2 3 1 4 2 0 5 6 2 5 0 3 1 2 1:(a) How many page faults will occur if the FIFO page replacement is used?(b) What if we use the "second chance" algorithm?Your answer should be justied (which references cause page faults and what is the reason).
Computer Science Given the reference string 2 1 3 5 3 4 3 1 Calculate the number of page faults using the OPTIMAL, LRU, FIFO page replacement algorithms with pure demand paging. Assume there are three total frames for the process. List the final contents of the frames.
“Dirty bit is used to reduce the overhead of page transfer”. Statewhether the given statement is true or false. Justify your answer withsuitable example.
4(a) The question for 4(a) is in the 1st image(7.3) - Filter ProcessesHint: Define an array of channels value[n] (int), and a set of filter processes Filter[i = 0 to n-1]. Each process Filter[i] (where 0 <= i <= n-2) receives a stream of integers through channel value[i], keeps the smallest, and sends out all other integers through channel value[i+1]. The last process Filter[n-1] receives only one integer through channel value[n-1], so it does not need to send out any integer. 4(b) Asynchronous message passing , Reader- Writer problem in 2nd image