![]() ![]() This is so because LRU is a stack algorithm. of page fault may decrease or remain same if no of frame is increased. Belady's anomaly states that increasing number of frames will never increase number of page faults if LRU page replacement algorithm is used. This phenomenon is an example of Belady's anomaly. That means no of page faults has decreased with the increase in frame number. The outputs show that the no of page fault for 4 frames are 17 while the no of page fault for 5 frames are 16. Replace the page having the least counter value with current page.Ĭ++ implementation of LRU page replacement algorithm and Belady's anomaly # include using namespace std int page_faults ( int page, int n, int frame_size ). ![]() We basically need to replace the page with minimum counter. Find the page in the set that was least recently used.Simultaneously maintain the recent occurred counter (which has come most recently or least recently) of each page in a map called page_counter. Insert pages one by one until the size of page_set reaches frame_size or all page references are processed. Page_set holds less pages than frame_size.Set page_fault=0 & frame_size to the value given as input.Write a program to simulate Least Recently Used (LRU) page replacement algorithm for the following page reference string: 9, 10, 11, 7, 12, 8, 7, 6, 12, 5, 4, 3, 10, 11, 12, 4, 5, 6, 9, 4, 5.Ĭonsider (i) 4 frames and (ii) 5 frames. ![]() Submitted by Radib Kar, on November 21, 2018 In this article, we are going to see how no of page faults changes with increase in frame size in LRU replacement policy? ![]()
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