Interactive Lab

OS Simulation Lab

Run real OS algorithms step-by-step. See animated Gantt charts, memory frames, resource graphs and process queues — all in real time.

12 Simulations Real-time Animation Instant Results

CPU Scheduling

Animated Gantt charts with waiting time & turnaround time calculation

FCFS Scheduling

First Come First Serve — the simplest CPU scheduling algorithm with animated process queue.

CPU Scheduling Easy

Shortest Job First — preemptive & non-preemptive modes with starvation analysis.

CPU Scheduling Medium

Configurable time quantum with animated context switching and circular queue.

CPU Scheduling Medium

Priority Scheduling

Priority-based scheduling with preemptive mode and starvation highlighting.

CPU Scheduling Hard

Memory Management

Visualize page replacement with animated memory frames and hit/miss tracking

FIFO Page Replacement

First-In-First-Out — replace the oldest page. Visual frame animation with fault counter.

Page Replacement Easy

LRU Page Replacement

Least Recently Used — animated stack showing recency order with live hit/miss ratio.

Page Replacement Medium

Optimal Replacement

Bélády's algorithm — look ahead to minimize page faults. Compare with other policies.

Page Replacement Hard

Deadlock & Synchronization

Visual resource graphs, safety sequence detection, and semaphore animations

Deadlock Detection

Build resource allocation graphs, detect cycles and visualize deadlock conditions.

Banker's Algorithm

Safety algorithm simulation with resource matrix, need matrix, and safe sequence finder.

Producer-Consumer

Semaphore-based buffer simulation with animated producer/consumer threads.

Synchronization Medium

Disk Scheduling

Animated seek visualization with total seek time calculation

Disk Scheduling Suite

FCFS, SSTF, SCAN, C-SCAN and LOOK algorithms with animated head movement chart.