C Program First in First Out FIFO Page Replacement Algorithm in c. Previous Page. Program for FIFO Page Replacement: Explanation Click Here /.-Title: Page Replacement Algorithms Program Developed By: Pritesh Abhiman Taral. Related C Topics beta. Logic For The Optimal Page Replacement Algorithm - Optimal Page Replacement Algorithm Programming Help; Page Replacement Algorithm - Confused (not Asking For Someone To Do It For Me) Source Code For Page Replacement - Can Any One Help Me To Implemnt The Page Replacement Algorithms In C+.
Optimal Page Replacement Algorithm In C
FIFO Page Replacement Goal:- Program for FIFO page replacement Method. Method:- First in First out (Queue) Explanation:- This is the simplest page replacement algorithm.In a page replacement algorithm we decide when a page replacement occures then which frames are to be replaced. For evaluating an algorithm we take a particular string of memory references,called reference string. In FIFO page replacement algorithm- for each page we track the time when it was brought into the memory and when any replacement request comes then oldest page is chosen. If we choose a queue to hold all pages in memory then its more easy to understand and implement rather than tracking time of all pages.
If we are using a queue in our implementation then: 1.Replacement of any page takes place at the head of the queue and 2.Insertion of pages takes place at the tail of the queue.
Least Recently Used Page Replacement Goal:- Program for LRU page replacement Method. Method:- Replace the page that has not been used for the longest period of time. Explanation:- As we seen in Algorithm the problem is Belady's Anomaly and this lead us to discovery of an method that will have minimum page fault rate.But the problem in Optimal Page Replacement is that it requires the future knowledge.
So in the place of optimal we can take a approximation of optimal in which we look for the pages that has not been used for a long time and predict that they will not be used in near future. So whenever a replacement request comes then we replace the new page with the page which has not been used for a long time and this method page replacement is known as Least Recently used(LRU) method. For evaluating an algorithm we take a particular string of memory references,called reference string. The LRU method is often used and considered to be good. The problem with this algorithm that how to implement LRU and there are several methods of implementing LRU. To know you can check my post(about to come).
Fifo Page Replacement Algorithm In Chinese
Page Fault:- Page Fault is a interrput that occurs when a program request page that is not in real memory.Then this interrput sends signal to OS to fetch that page from Virtual memory and load it into RAM.Program explained here counts the no. Of page fault occurs when a input reference string is implemented onto Memory according to LRU replacement method. Example:- Reference string- 7,0,1,2,0,3,0,4 No. Of frames: 3 Frame NO.Reference String(Page Values)Initially7012222242-1-100000003-1-1-1111333When any page value already presented in frames then no page fault will occur.Program:-Output.