PageReplacement_Algorithms

Page replacement algorithms to analyse page fault and belady's anomaly and thrashing.

Algorithms

1. Least Recently Used (LRU)
2. Most Recently Used (MRU)

Some Useful Information

• The reference string is randomly generated using a seed value. This seed value is generated using the current time. So, the reference string will be different every time the program is run.
• The user can provide 3 values as command line arguments. These values are:
  1. Maximum frame size
  2. Maximum page array size (the maximum number of pages in the reference string)
  3. Flag

Flags

• sf: Fixed reference string for each call as the frame size increments.
• sr: Random reference string for each call as the frame size increments.

How to run

1. Clone the repository
2. Run the following commands in the terminal to compile the code:

   g++ mru.cpp pbPlots.cpp supportLib.cpp -lm -o mru
   g++ lru.cpp pbPlots.cpp supportLib.cpp -lm -o lru

3. Run the following commands in the terminal to generate plots:

   ./mru <maxFrameSize> <maxPageArraySize> -<flag>
   ./lru <maxFrameSize> <maxPageArraySize> -<flag>

   Replace the placeholders with the desired values. ¹
   

This program will generate plots for the algorithms in "./plots/" folder.

Naming convention for the plots is as follows: "<Algorithm Name>-<flag>-<maxFrameSize>-<maxPageArraySize>"

Footnotes

1. Note: All three command line args must be provided. ↩