Virtual memory

VIRTUAL MEMORY Presented by: - Aaina

CONTENTS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

VIRTUAL MEMORY ,[object Object],[object Object],[object Object],Virtual address (1) Not present (4) Page frames (3) Page frame + x present (5) Secondary storage Page frames CPU Logical page + x Mapper

NEED OF VIRTUAL MEMORY ,[object Object],[object Object]

IMPORTANCE OF VIRTUAL MEMORY ,[object Object],[object Object]

ADVANTAGES OF VIRTUAL MEMORY ,[object Object],[object Object],[object Object]

DISADVANTAGES OF VIRTUAL MEMORY ,[object Object],[object Object],[object Object],[object Object]

ADDRESS SPACE AND MEMORY SPACE ,[object Object],[object Object],[object Object],[object Object]

PAGE FRAME AND HIT RATIO ,[object Object],[object Object],[object Object],[object Object],total number of hits + total number of mis

PAGE REPLACEMENT ALGORITHMS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

FIFO ,[object Object],[object Object],[object Object],[object Object],hit hit hit time page p2* p2* p3 P3* P5 p2 P3 P5 P4* P3 P2* p4 P3 p2* p4 p5* P2 p4 p5* P2 p4 p5 P2 P1* P5 p3* p1 p2* P3 P1 p2* p3 1 2 3 4 5 6 7 8 9 10 11 12 P2 p3 p2 p1 p5 p2 p4 p5 p3 p2 p5 p2

LRU ,[object Object],[object Object],time page hit hit hit hit hit p2* p2* p3 P3* P5 p2 P3* P5 P2 P3 P5* P2 P3 P5 p4* p2* P5 P4 P2 p5* p4 P2 P5 P1* p2* P5 P1 P2 p3* P1 P2 p3* 1 2 3 4 5 6 7 8 9 10 11 12 P2 p3 p2 p1 p5 p2 p4 p5 p3 p2 p5 p2

OPT ,[object Object],[object Object],hit hit hit hit hit time page hit p2 p2 p3 P2 P3 P5 P2 P3 P5 P2 P3 P5 P4 P3 p5 P4 P3 P5 P4 P3 p5 P2 P3 P5 P2 P3 P5 P2 p3 P1 P2 p3 1 2 3 4 5 6 7 8 9 10 11 12 P2 p3 p2 p1 p5 p2 p4 p5 p3 p2 p5 p2

Virtual memory

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Virtual memory