 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 transcript:

 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

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

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

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

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

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

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

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

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

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

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

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

Process Memory space Process

Frame no Page no

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

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

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

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