What is the reason for using the LRU page replacement algorithm?

LRU (Least Recently Used) is a page replacement algorithm that is commonly used in computer operating systems and cache memory management.

The purpose of the LRU algorithm is to replace the least recently used page in memory to optimize and improve system performance and minimize page fault issues.

How does the LRU algorithm work?

The purpose of the LRU algorithm is to improve system performance, Which is based on the idea that the pages that have not been used for the longest time are the least likely to be used in the near future.

The algorithm keeps a log of pages used. So that when a new page needs to be loaded in memory but memory does not have enough space to load it, The LRU algorithm identifies the pages least recently used and removes them from memory to accommodate new page requests.

The LRU algorithm uses a queue or a list to track page usage order. Recently used pages will be moved to the front of the queue, which indicates the most recently used pages. The page at the end of the queue indicates least recently used.

LRU algorithm program in c: Implementing LRU Page Replacement Algorithm

#include 
#include 

// Function to find the index of the least recently used page
int findLRUIndex(int pages[], int n, int used[], int m) {
    int i, min = used[0], index = 0;
    for (i = 1; i 

LRU program in c with output:

Enter the number of pages: 12
Enter the page reference string: 2 3 1 4 2 5 3 4 6 7 4 3
Enter the number of memory frames: 3

LRU Page Replacement Simulation:
Memory frames after request 2: 2 Empty Empty 
Memory frames after request 3: 2 3 Empty 
Memory frames after request 1: 2 3 1 
Memory frames after request 4: 4 3 1 
Memory frames after request 2: 4 2 1 
Memory frames after request 5: 4 2 5 
Memory frames after request 3: 3 2 5 
Memory frames after request 4: 3 4 5 
Memory frames after request 6: 6 4 5 
Memory frames after request 7: 6 7 5 
Memory frames after request 4: 6 7 4 
Memory frames after request 3: 3 7 4