Given the following page-reference string, show the allocation of 3 frames of memory using FIFO ,...
Given the following page-reference string, show the allocation of 3 frames of memory using FIFO , LRU and OPT. How many page faults for FIFO, LRU and OPT?
3,1,2,1,3,1,4,1,3,2,4,2,5,6,4,6,2,1,6,5
Homework Answers
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First-In-First-Out (FIFO) Replacement:
On a page fault, the frame that has been in memory the longest is replaced.
Optimal Replacement:
It looks forward in time to see which frame to replace on a page fault.
Least Recently Used (LRU) Replacement:
On a page fault, the frame that was least recently used in replaced.
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