Difference Between LRU and FIFO Page Replacement Algorithms in Operating System Last Updated : 07 Sep, 2023 Summarize Comments Improve Suggest changes Share Like Article Like Report Page replacement algorithms are used in operating systems to manage memory effectively. Page replacement algorithms are essential in operating systems for efficient memory management. These algorithms select which memory pages should be changed when a new page is brought. Least Recently Used (LRU) and First-In-First-Out (FIFO) are two popular page replacement algorithms. LRU (Least Recently Used)LRU keeps track of the page usage order based on the most recent access.When a page fault occurs, the page that has been least recently used is replaced.It requires additional data structures, such as a linked list or a priority queue, to maintain the order of page usage.The LRU algorithm provides better performance by minimizing the number of page faults.Read more about LRU page replacement.FIFO (First-In-First-Out)FIFO follows the simple principle of replacing the page that entered memory first.When a page fault occurs, the oldest page, which arrived earliest, is replaced.It does not require any additional data structures to maintain the order of page usage.The FIFO algorithm is straightforward to implement but may not always provide optimal performance.Read more about FIFO page replacement.LRU vs FIFODifferencesLRUFIFOPrincipleReplaces the least recently used pageReplaces the oldest page in memoryData StructureRequires additional data structure for tracking page usage orderNo additional data structure requiredPerformancePerforms better in reducing page faultsMay not always provide optimal performanceAccess Pattern SensitivitySensitive to the access pattern of pagesNot sensitive to the access patternImplementation ComplexityRelatively more complex to implementSimple to implementConclusionFinally, the LRU and FIFO page replacement algorithms provide distinct strategies for memory management in operating systems. LRU prioritizes replacing the most recently used page while accounting for the temporal locality of page accesses. It requires additional data structure to keep track of page usage and, in general, performs better in terms of decreasing page faults. FIFO replaces the oldest page in memory on a first-in-first-out basis. It does not take into account the frequency of page usage and doesn't require additional data structures. FIFO, on the other hand, may not always deliver ideal performance. Comment More infoAdvertise with us Next Article Counting Based Page Replacement Algorithm in Operating System A abhinavkuppasad27 Follow Improve Article Tags : Operating Systems Difference Between Similar Reads Counting Based Page Replacement Algorithm in Operating System Counting Based Page Replacement Algorithm replaces the page based on count i.e. number of times the page is accessed in the past. If more than one page has the same count, then the page that occupied the frame first would be replaced. Page Replacement: Page Replacement is a technique of replacing a 5 min read Page Replacement Algorithms in Operating Systems In an operating system that uses paging for memory management, a page replacement algorithm is needed to decide which page needs to be replaced when a new page comes in. Page replacement becomes necessary when a page fault occurs and no free page frames are in memory. in this article, we will discus 7 min read Difference between page and block in operating system In an operating system, a block is a variable-size storage that can either read a file or write data into a file. The page is a fixed-size memory unit that can be loaded into the processor from main memory. In this article, we will provide an overview of the page and block in the operating system an 7 min read Difference between Loading and Linking in Operating System An operating system acts as an intermediary between the user of a computer and computer hardware. The purpose of an operating system is to provide an environment in which a user can execute programs conveniently and efficiently. Linking and Loading are utility programs that play an important role in 4 min read Page Buffering Algorithm in Operating System The Page Buffering Algorithm is used in Operating systems and Database Management Systems as a key method to streamline data access and minimize disc I/O operations. It is largely used in virtual memory systems, where data is kept on secondary storage (disc) and brought into main memory as needed.Th 7 min read Difference between SSTF and LOOK disk scheduling algorithm Disk scheduling algorithms are used by operating systems to decide the order in which disk I/O requests are processed. Since disk access time is relatively slow, these algorithms aim to reduce the time it takes to read/write data by optimizing the movement of the disk arm.SSTF(Shortest Seek Time Fir 3 min read Like