WGU C191 - Chapter 7,8 & 9 Problem set study Exam Questions and Correct Answers Guaranteed Success 2024/2025
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WGU C191
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WGU C191
WGU C191 - Chapter 7,8 & 9 Problem set study Exam Questions and Correct Answers Guaranteed Success 2024/2025
advantages of virtual memory - correct answer
only part of program needs to be in memory for execution --> logical address space > physical address space
allows address spaces ...
WGU C191 - Chapter 7,8 & 9 Problem set
study Exam Questions and Correct Answers
Guaranteed Success 2024/2025
advantages of virtual memory - correct answer
only part of program needs to be in memory for execution --> logical address space >
physical address space
allows address spaces to be shared by multiple processes --> less swapping
allows pages to be shared during fork (), speeding process creation
page fault - correct answer results from the first time there is a reference to a specific
page → traps the OS
Locality of Reference - correct answer behavior observed in many executing programs
in which memory locations recently referenced, and those near them, are likely to be
referenced in the near future
Demand Paging - correct answer brings a page into memory only when it is needed --
> less I/O and memory needed
could result in a lot of page-faults
Lazy Swapper - correct answer never swaps a page into memory unless page will be
needed
optimize Demand Paging - correct answer loading entire process image to swap space
at process load time
Pure Demand Paging - correct answer process starts with no pages in inventory
, Copy-on-Write (COW) - correct answer allows both parent and child processes to
initially share the same pages in memory
if either process modifies a shared page, only then is the page copied
modify (dirty) bit - correct answer can be used to reduce overhead of page transfers →
only modified pages written to disk
second chance algorithm - correct answer uses a reference bit
▪ If 1, decrement and leave in memory
▪ If 0, replace next page
fixed page allocation - correct answer proportional allocation -- allocate according to
size of process
global replacement - correct answer process selects a replacement frame from set of
all frames
- one process can take frame from another
- process execution time can vary greatly
- greater throughput
local replacement - correct answer each process selects from only its own set of
allocated frames
- more consistent performance
- possible under-utilization of memory
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