A modern, user-friendly FIFO Page Replacement Algorithm visualizer built using Python and CustomTkinter.

This simulator demonstrates how the FIFO page replacement method works using a step-by-step animated visualization.

• ✔ Modern Dark UI
• ✔ Step-by-Step Animation
• ✔ Clear Visualization
  • Step number
  • Page accessed
  • Frame status after each step
  • Fault occurrence
  • Total page faults
  • Hit ratio
• ✔ Input Controls
  • Set reference string (up to 10 pages)
  • Choose number of frames (3, 4, or 5)
  • Reset all inputs easily

1. Install Python

Make sure Python 3.8+ is installed.

2. Install Dependencies

pip install customtkinter

3. Run the Simulator

python main.py

• FIFO (First-In-First-Out) Page Replacement
  • The oldest loaded page is replaced first.
  • A queue is used to track the order of page arrival.
  • For every page reference:
    • If the page is not in memory → Page Fault
    • If frames are full → Replace the oldest page

========================= FIFO SIMULATION =========================
Reference String: [7, 0, 1, 2, 0, 3]
Number of Frames: 3

Step   Page     Frames After                  Fault
───────────────────────────────────────────────────────────────
1      7        7 - -                         YES
2      0        7 0 -                         YES
3      1        7 0 1                         YES
4      2        0 1 2                         YES
5      0        0 1 2                         No
6      3        1 2 3                         YES

==================================================================
TOTAL PAGE FAULTS: 5
HIT RATIO: 16.7%
==================================================================