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This chapter delves into various page replacement algorithms used in memory management, highlighting the limitations of exact LRU and introducing approximate LRU methods such as reference bits and sampled LRU. It discusses the clock algorithm and second chance strategies while also addressing Belady's anomaly, which challenges conventional expectations regarding page fault occurrences with increased memory frames. The chapter emphasizes the importance of efficiently managing memory references to optimize system performance.
Chapter 1924 sections
This chapter delves into various page replacement algorithms used in memory management, highlighting the limitations of exact LRU and introducing approximate LRU methods such as reference bits and sampled LRU. It discusses the clock algorithm and second chance strategies while also addressing Belady's anomaly, which challenges conventional expectations regarding page fault occurrences with increased memory frames. The chapter emphasizes the importance of efficiently managing memory references to optimize system performance.
Approximate LRU uses reference bits to manage memory more efficiently than exact LRU.
The clock algorithm provides a second chance to recently accessed pages, improving replacement decisions.
Belady's anomaly illustrates that increasing memory frames can lead to more page faults, contradicting intuitive expectations.
A memory management strategy that uses reference bits to approximate the least recently used algorithm by tracking page usage within defined intervals.
A page replacement algorithm that arranges pages in a circular list and gives recently accessed pages a second chance before replacing them.
An occurrence where increasing the number of page frames results in a higher number of page faults, which is counterintuitive as one would expect fewer faults with more frames.
Total Questions
2
Estimated Time
4 min
Passing Score
70%
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