16 Questions
In the context of page replacement policies, what is the optimal policy if we had knowledge of the future page accesses?
Choose the page which will be referenced farthest in the future
Which replacement policy takes into account the recent references and uses the concept of locality of references?
NRU (Not-Recently-Used)
What hardware support is available for each page frame to aid in replacement policies?
Referenced Bit (R) and Modified Bit (M)
Which replacement policy involves selecting the page that has not been used recently for replacement?
FIFO (First-In-First-Out)
What is the purpose of knowing about the optimal policy in page replacement?
To improve the performance of real algorithms
Which replacement policy focuses on selecting the least frequently used page for replacement?
NFU (Not Frequently Used)
Which algorithm removes a page at random from the lowest numbered non empty class?
Not Recently Used (NRU)
In the FIFO - Second Chance algorithm, what happens to old pages that have been used recently (R=1)?
They are given a second chance and moved to the end of the list
What does the 'hand' of the clock algorithm point to when required to evict a page with R=0?
The page to be replaced
Which page replacement policy replaces the page in memory that has been unused for the longest time?
Least Recently Used (LRU)
What is one possible implementation of the LRU policy that involves updating a list of pages after every memory reference?
Updating a list of pages, most recently used at front, least at rear
What characteristic distinguishes the Not Recently Used (NRU) algorithm from other page replacement policies?
It categorizes pages into four classes based on access time
In the context of page replacement policies, what is meant by 'dirty bit'?
A flag indicating whether a page has been modified
What drawback is associated with the FIFO - Second Chance algorithm?
Pages keep moving around in its list
'Hit ratio' is a metric commonly used to measure what aspect of page replacement policies?
Page replacement accuracy
'Locality of Reference' implies that...
Only pages used in the near past will be used in near future
Test your understanding of page replacement policies in operating systems with this quiz focused on the problem statement, optimal policy, and related concepts. Explore page replacement strategies and challenges in memory management.
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