How do I replace LRU pages?
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Hereof, how does LRU page replacement work?
In the Least Recently Used (LRU) page replacement policy, the page that is used least recently will be replaced. Implementation: Add a register to every page frame - contain the last time that the page in that frame was accessed. Use a "logical clock" that advance by 1 tick each time a memory reference is made.
Subsequently, question is, what causes a page fault? Page Fault. A page fault occurs when a program attempts to access a block of memory that is not stored in the physical memory, or RAM. However, an invalid page fault may cause a program to hang or crash. This type of page fault may occur when a program tries to access a memory address that does not exist.
Beside above, what is meant by page replacement?
The page replacement algorithm decides which memory page is to be replaced. The process of replacement is sometimes called swap out or write to disk. Page replacement is done when the requested page is not found in the main memory (page fault).
Which is better FIFO or LRU?
FIFO keeps the things that were most recently added. LRU is, in general, more efficient, because there are generally memory items that are added once and never used again, and there are items that are added and used frequently. LRU is much more likely to keep the frequently-used items in memory.