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Page replacement algorithm
The page replacement algorithm is an algorithm used by the operating system to determine which pages in memory should be swapped out to make room for new pages. This topic provides you with articles related to the page replacement algorithm, which you can experience for free.
What are the page replacement algorithms?Page replacement algorithms include: 1. FIFO algorithm, which replaces the earliest page that enters the memory by maintaining a page queue; 2. LRU algorithm, which performs page replacement based on the access history of the page; 3. LFU algorithm, which performs page replacement based on the number of page accesses. To perform page replacement; 4. Clock algorithm, by using a clock pointer to traverse the page queue, replace the page pointed by the clock pointer; 5. OPT algorithm, decide which page should be replaced according to the best strategy, that is, choose to Pages that will not be visited for the longest time in the future are replaced.
How to understand the page replacement algorithmUnderstand the page replacement algorithm: When a page fault occurs, if there is no free page in the operating system memory, the operating system must select a page in the memory and move it out of the memory to make room for the page to be transferred in, and use it to select The rules for which pages to eliminate are called page replacement algorithms.
What is the page replacement algorithm?During the address mapping process, if it is found that the page to be accessed is not in the memory, a page fault interrupt will occur. When a page fault occurs, if there is no free page in the operating system's memory, the operating system must select a page in the memory and move it out of the memory to make room for the page to be transferred in, and the rules used to select which page to eliminate It's called the page replacement algorithm.
What page replacement algorithm is fifo?fifo refers to the first-in-first-out page replacement algorithm. The page that is first transferred into the memory for each replacement is the page that has been waiting the longest in the memory. Advantages: It is relatively simple to implement and does not require hardware support, so there is no need to increase the cost of the system.
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