Page Replacement Policies ⭐

Implementation of various page replacement policies including First in First out (FIFO), Least Recently Used (LRU), Approximate LRU and Random on Looping, No Locality and 80-20 workloads.

Directory Structure 📁

page_replacement_policies
├─ checker.c
├─ CSV
│  ├─ FIFO_LOCAL.csv
│  ├─ FIFO_LOOP.csv
│  ├─ FIFO_RAND.csv
│  ├─ LRU_APPROX_LOCAL.csv
│  ├─ LRU_APPROX_LOOP.csv
│  ├─ LRU_APPROX_RAND.csv
│  ├─ LRU_LOCAL.csv
│  ├─ LRU_LOOP.csv
│  ├─ LRU_RAND.csv
│  ├─ RANDOM_LOCAL.csv
│  ├─ RANDOM_LOOP.csv
│  └─ RANDOM_RAND.csv
├─ definitions.h
├─ generate.c
├─ main.c
├─ Makefile
├─ plot.py
├─ plots
│  ├─ LOCAL_100_Unique.png
│  ├─ LOCAL_50_Unique.png
│  ├─ LOOP_100_Unique.png
│  ├─ LOOP_50_Unique.png
│  ├─ RAND_100_Unique.png
│  └─ RAND_50_Unique.png
├─ policy.c
├─ README.md
└─ workload.c

Feature Checklist ✅

✅ Least Recently Used(LRU)
✅ Approximate Least Recently Used (Clock-Hand Algorithm)
✅ First-In-First-Out(FIFO)
✅ Random

Instructions to Run 🏃

- Run `make` to build, execute and generate plots.
- Run `make check` to run the checker test file
- Run `make clean` to remove the build files 

Results and Conclusions 📰

• Workload of size 10000 pages

• Cache Size of 100

• 80-20

  Unique Pages = 100	Unique Pages = 50

• Random

  Unique Pages = 100	Unique Pages = 50

• Looping

  Unique Pages = 100	Unique Pages = 50

Complexity Analysis

FIFO Policy

• Using array for maintaining cache
• Space Complexity: O(cache_size)
• Time Complexity: O(cache_size*size)

LRU Policy

• Using array for maintaining cache and last accessed time
• Space Complexity: O(cache_size)
• Time Complexity: O(cache_size*size)

LRU Approx Policy

• Using array for maintaining cache and bit references
• Space Complexity: O(cache_size)
• Time Complexity: O(cache_size*size)

Random Policy

• Using array for maintaining cache
• Space Complexity: O(cache_size)
• Time Complexity: O(cache_size*size)