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 Just as processes share the CPU, they also share physical memory. This section is about mechanisms for doing that sharing. EXAMPLE OF MEMORY USAGE Calculation.

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Presentation on theme: " Just as processes share the CPU, they also share physical memory. This section is about mechanisms for doing that sharing. EXAMPLE OF MEMORY USAGE Calculation."— Presentation transcript:

1  Just as processes share the CPU, they also share physical memory. This section is about mechanisms for doing that sharing. EXAMPLE OF MEMORY USAGE Calculation of aneffective address ° Fetch from instruction ° Use index offset

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3 Relocatable Binding o Compiler o linker o loader C=a+b Reserve Memory Area

4 Object Module Binary Prog.. Source Program Java source program(.java) Class file (.class) Binary file (0,1) Memory allocation, swaping, paging process

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8 Process Free space 6 K.B. Process Free space 12 K.B. Free space 12 K.B. Free space 3 K.B. Process Memory space

9 Process Free space 6 K.B. Process Free space 12 K.B. Free space 12 K.B. Free space 3 K.B. Process Memory space

10 Process Free space 6 K.B. Process Free space 12 K.B. Free space 12 K.B. Free space 3 K.B. Process 6 K.B. Process

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12 Process Free space 6 K.B. Process Free space 12 K.B. Free space 12 K.B. Free space 3 K.B. Process Memory space

13 Process Free space 6 K.B. Process Free space 12 K.B. Free space 12 K.B. Free space 3 K.B. Process Memory space

14 Process Free space 6 K.B. Process Free space 12 K.B. Free space 12 K.B. Free space 3 K.B. Free space 3 K.B. Process 6 K.B. Process 1 K.B. free 1 K.B. free 2 Mb Process

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16 Process Free space 24 K.B. Free space 12 K.B. Free space 12 K.B. Free space 3 K.B. Process Memory space

17 Process Free space 24 K.B. Free space 24 K.B. Free space 12 K.B. Free space 12 K.B. Free space 3 K.B. Process Memory space

18 Process Free space 12 K.B. Free space 12 K.B. Free space 3 K.B. Free space 3 K.B. Process 6 K.B. Process Free space 24 K.B. Free space 18 K.B. 9 K.B. Free 3 K.B. Process

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20 Process Memory space Process

21 Frame no Page no

22 pd f P F P d d=offset Page noFrame no

23 Page no P=1 Logical & Physical = offset d=3

24 pd f P F P d d=offset Page noFrame no


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