Program for fifo lru and optimal page replacement algorithm

Page replacement happens when a requested page is not in memory page fault and a free page cannot be used to satisfy the allocation, either because there are none, or because the number of free pages is lower than some threshold. In FIFO algorithm, the operating system keeps track of all pages in the memory in a queue, the oldest page is in the front of the queue.

When a page needs to be replaced, the page in the front of the queue is selected for removal. The second line is the number of processes m. Remove the indexes page. Increment page faults. This code is contributed by PranchalK. Contains pages[i]. Add pages[i] ;. Enqueue pages[i] ;. Remove the first page of the queue from. Peek ;. Dequeue ;. Remove val ;. Write pageFaults pages, pages. Length, capacity ;. Next Find the transition point in a binary array. Recommended Articles. Minimize replacement of characters to its nearest alphabet to make a string palindromic.

Check if a string can be made equal to another string by swapping or replacement of characters. Article Contributed By :. Easy Normal Medium Hard Expert. Writing code in comment? Like Article. We use. Contains pages[i]. Add pages[i] ;. ContainsKey pages[i]. Add pages[i], i ;. Remove val ;. WriteLine pageFaults pages,. Length, capacity ;. Python3 program for page replacement algorithm. List of current pages in Main Memory. If i is not present in currentPages list.

Check if the list can hold equal pages. Increment Page faults. If page is already there in. Remove previous index of current page. Now append it, at last index. Contains i. RemoveAt 0 ;.