Consider a system in which a process is allocated three frames in memory. Given the page requests of this process as "1, 4, 5, 3, 4, 5, 6, 1, 7, 5, 6, 1, 3, 2, 6, 5, 2, 1, 5, 2", trace the utilization of the three frames by this process when using the Optimal, FIFO, LRU replacement algorithms. To compare the efficiency of using each algorithm, find the total number of page faults and the effective access time. Assume that the memory access time is 100 nanoseconds and the average page-fault service time is 4 microseconds. Number of page faults- Effective Access Time-. 4561756132652 Number of page faults. Effective Access Time. Number of page faults. Effective Access Time= Optimal Replacement FIFO Replacement LRU Replacement

Consider a system in which a process is allocated three frames in memory. Given the page requests of this process as "1, 4, 5, 3, 4, 5, 6, 1, 7, 5, 6, 1, 3, 2, 6, 5, 2, 1, 5, 2", trace the utilization of the three frames by this process when using the Optimal, FIFO, LRU replacement algorithms. To compare the efficiency of using each algorithm, find the total number of page faults and the effective access time. Assume that the memory access time is 100 nanoseconds and the average page-fault service time is 4 microseconds. Number of page faults- Effective Access Time-. 4561756132652 Number of page faults. Effective Access Time. Number of page faults. Effective Access Time= Optimal Replacement FIFO Replacement LRU Replacement

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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Similar questions

1) Given 6 memory partitions of 230 KB, 790 KB, 120 KB, 600 KB, 335 KB and 540 KB (in order). How would the first-fit, best-fit and worst first algorithms place processes of size 210 KB, 20 KB, 195 KB, 100 KB, 200 KB and 125 KB (in order)? Indicate which-if any-requests cannot be satisfied. Comment on how efficiently each of the algorithms manages memory.
Given 6 memory partitions of 230 KB, 790 KB, 120 KB, 600 KB, 335 KB and 540 KB (in order). How would the first-fit, best-fit and worst - first algorithms place processes of size 210 KB, 20 KB, 195 KB, 100 KB, 200 KB and 125 KB (in order)? Indicate which-if any-requests cannot be satisfied. Comment on how efficiently each of the algorithms manages memory. P
:Consider the following sequence of page references 9,8 ,6 ,9 ,5 ,9 ,7,8,6.7.6 .5 .Assuming that all the frames are initially empty, indicate the contents of memory after each reference .Calculate the number of page faults a. FIFO Page replacement algorithm with 4 frames: 6 9 5 9 7 6 7 5 Reference String Frame 1 Frame 2 Frame 3 Frame 4 Page Faults Page faults: b. LRU Page replacement algorithm with 4 frames: Reference 9| 5 9 7 6 6 5 String Frame 1 Frame 2 Frame 3 Frame 4
Give a comparison of FIFO, LRU and OPTIMAL algorithms in term of Page faults with three and four frames in each case for the reference string of pages duly demanded in Main Memory. Reference String: 2, 3, 3, 2, 1, 4, 0, 0, 3, 2, 1, 1, 2, 3, 4
Consider the following virtual page reference string: 1, 2, 3, 4, 2, 1, 5, 6, 2, 1, 2, 3, 7, 6, 3, 2, 1, 2, 3, 6. How many page faults would occur for the following replacement algorithms, assuming the physical memory has a total size of one, two, three, or four physical pages? Assume that all physical pages are initially empty (i.e., the system is newly started), so your fırst unique pages will all cost one fault each. • Strict LRU replacement (assuming all the timestamps in the history can be captured and stored precisely) • FIFO replacement Number of physical frames LRU FIFO 20 20 2 3 10 14 4.
Think of a search engine that employs TF*IDF weights and a vector space model to provide results. A simple system would need to go over every page in the collection to compute the similarity between the query and each item. Briefly describe how an inverted index may be used to enhance the IR system's performance.
Another placement algorithm for dynamic partitioning is referred to as worst-fit. In this case, the largest free block of memory is used for bringing in a process. Discuss the pros and cons of this method compared to first-, next-, and best-fit. What is the average length of the search for worst-fit?
Consider an i786 demand paging system that adopts a page size of 2,000 bytes. Process A is allotted FOUR empty page frames initially and receives the following sequence of virtual addresses: 73 1380 2370 6380 9973 4500 11020 4245 Conduct a page trace analysis to indicate the number of page faults and then compute the numbers of page faults by using the following algorithms. i)First-In-First-Out (FIFO) algorithm and Optimal page replacement algorithm.
Consider the below algorithm: for (i=1;i < n;i++){ for (j=1;j < m;j++){ Alloc[i][j]=( 2i *( j+1 ) % 7) } } For n=13 and m=6 answer the following questions This part of the problem involves in deriving the Allocation matrix for a set of threads for implementing Banker's algorithm. Consider the system has five threadts (T0~T4) and five resourses (A~E) [Remember all threads are in CAPITAL letter]. Currents allocation matrix follows the following rule: T0 has allocated resources equal to the value of row A[2] of Alloc[i][j] array, T1 has equal to row A[3], T2 has equal to row A[6], T3 has equal to row A[10] and T4 has equal to row A[12]. What is the allocated resource for thread T0
Consider the weighted interval scheduling problem, we have the following iterative solution (see 1.2.6 (and earlier sections if needed) of L6) to the problem: Assume we have n requests (1. n). For each request i, v(i) is the value of /. Recall we have defined function previous in class. ***** Line 1: for i from 0 to n, M[i]:= 0. Line 2: for i from 1 to n, M[i]:= max(v(i) + M[previous(i)], M[i-1]) SEE Per a) Write down precisely what is the intended meaning of the data structure M[...] b) Why do we do line 1? c) Explain the meaning of M[i]:= max(v(i) + M[previous()], M[i-1]) in Line 2.
Apply FIFO , LRU and OPTIMAL page replacement algorithms for following page reference string 3,4,2,3,4,3,4,5,7,6,4,3,2,3,4,5,4. Assume 3 frames and all frames are initially empty. Show all the steps. 2A.