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PAGE MANAGEMENT STRATEGIES, where in primary memory should data be placed,…
PAGE MANAGEMENT STRATEGIES
FETCH
when to bring data into primary memory
TYPES:
DEMAND PAGING
ANTICIPATORY PAGING
PLACEMENT
TYPES
Worst Fit
allocate the largest hole
weaknesses
produce the largest leftover hole, which may be big enough to hold another process
suffer external fragmentation
Best fit
the memory manager places a process in the smallest memory in which it will fit
weaknesses
produces the smallest leftover hole
suffer external fragmentation
First Fit
allocate the first hole that is big enough
weaknesses
Fragment the blocks near the beginning of the list
may cause internal fragmentation
it is the process of assigning blocks of memory on request
REPLACEMENT
Far Page
Second Chance and Clock Page
Random
LFU
LRU
Least-Recently-Used
FIFO
First-In-First-Out
FRAGMENTATION
typical computer problem. can be small and problematic
causes waste of space
types
internal fragmentation
external fragmentation
applies in memory or computer storage
causes:
inefficient management
capacity reduction/performance
where in primary memory should data be placed
which page should be replaced, if primary memory is full