FIFO Algorithm
First In First Out page replacement algorithm simulator
Open Simulator
FIFO Simulator Details
- Implements the First-In-First-Out page replacement algorithm
- Replaces the oldest page in memory when a page fault occurs
- Features:
- Visual representation of memory frames
- Step-by-step simulation
- Page fault tracking
- Performance statistics
LRU Algorithm
Least Recently Used page replacement algorithm simulator
Open Simulator
LRU Simulator Details
- Implements the Least Recently Used page replacement algorithm
- Replaces the page that hasn't been used for the longest time
- Features:
- Access time tracking for each page
- Visual timeline of page usage
- Page fault analysis
- Performance comparison
LFU Algorithm
Least Frequently Used page replacement algorithm simulator
Open Simulator
LFU Simulator Details
- Implements the Least Frequently Used page replacement algorithm
- Replaces the page that has been used least frequently
- Features:
- Frequency counter for each page
- Usage statistics visualization
- Page fault tracking
- Performance metrics
MFU Algorithm
Most Frequently Used page replacement algorithm simulator
Open Simulator
MFU Simulator Details
- Implements the Most Frequently Used page replacement algorithm
- Replaces the page that has been used most frequently
- Features:
- Frequency tracking for each page
- Usage pattern visualization
- Page fault analysis
- Performance statistics
Second Chance
Second Chance page replacement algorithm simulator
Open Simulator
Second Chance Simulator Details
- Implements the Second Chance page replacement algorithm
- Gives pages a second chance before replacement
- Features:
- Reference bit tracking
- Circular queue visualization
- Page fault analysis
- Performance comparison
Random Replacement
Random page replacement algorithm simulator
Open Simulator
Random Replacement Simulator Details
- Implements the Random page replacement algorithm
- Randomly selects a page for replacement
- Features:
- Random selection visualization
- Page fault tracking
- Performance analysis
- Statistics comparison
Optimal Algorithm
Optimal page replacement algorithm simulator
Open Simulator
Optimal Simulator Details
- Implements the Optimal page replacement algorithm
- Replaces the page that will not be used for the longest time
- Features:
- Future reference prediction
- Optimal replacement visualization
- Page fault analysis
- Performance metrics
Page Replacement Algorithms - Theory
Page replacement algorithms are crucial in operating systems to manage memory efficiently. When a page fault occurs and there are no free frames available, the operating system must select a page to replace. Different algorithms use different strategies to make this selection:
Key Algorithms:
- FIFO (First In First Out): Replaces the oldest page in memory
- LRU (Least Recently Used): Replaces the page that hasn't been used for the longest time
- LFU (Least Frequently Used): Replaces the page that has been used least frequently
- MFU (Most Frequently Used): Replaces the page that has been used most frequently
- Second Chance: Gives pages a second chance before replacement
- Random: Randomly selects a page for replacement
- Optimal: Replaces the page that will not be used for the longest time (theoretical)
Performance Metrics:
- Page Fault Rate
- Memory Utilization
- Algorithm Overhead
- Implementation Complexity
How to Use the Simulators:
- Click on any simulator button to open the specific algorithm's simulation
- Enter the reference string (comma-separated page numbers)
- Set the number of frames in memory
- Click "Simulate" to see the algorithm in action
- Observe the step-by-step execution and results
- Compare different algorithms using the same input