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Process Scheduling Simulator

Welcome to our advanced Process Scheduling Simulator, a comprehensive educational platform designed to demystify CPU scheduling algorithms through interactive visualization and hands-on experimentation.

Key Features

  • Dynamic Visualization: Watch processes come to life with our interactive Gantt charts, offering real-time visualization of CPU scheduling decisions and process execution flows.
  • Comprehensive Algorithm Support: Master five fundamental scheduling algorithms:
    • First Come First Serve (FCFS) - Non-preemptive, arrival-time based scheduling
    • Shortest Job First (SJF) - Non-preemptive, burst-time based scheduling
    • Shortest Remaining Time First (SRTF) - Preemptive version of SJF
    • Priority Scheduling - Priority-based process execution
    • Round Robin - Time-quantum based fair scheduling
  • Interactive Process Management: Create, modify, and control processes with customizable parameters including:
    • Arrival Time - When processes enter the system
    • Burst Time - CPU time required for execution
    • Priority Levels - For priority-based scheduling
    • Time Quantum - For Round Robin scheduling
  • Detailed Performance Metrics: Analyze scheduling efficiency through:
    • Average Waiting Time - Time spent in ready queue
    • Average Turnaround Time - Total time from arrival to completion
    • CPU Utilization - Efficiency of CPU usage
    • Context Switches - Number of process switches
  • Real-time Process Tracking: Monitor process states with:
    • Ready Queue Visualization
    • Context Switch Indicators
    • Process State Colors (Running, Preempted, Completed)
    • Timeline-based Execution Flow

Perfect For

  • Students: Reinforce your understanding of operating system concepts through practical experimentation
  • Educators: Demonstrate scheduling concepts with visual, interactive examples
  • Professionals: Refresh your knowledge of CPU scheduling mechanisms
  • Enthusiasts: Explore process scheduling behavior in a hands-on environment

Learning Outcomes

  • Understand the mechanics of different CPU scheduling algorithms
  • Compare and analyze algorithm performance metrics
  • Visualize process execution and scheduling decisions
  • Master concepts of process states and transitions
  • Gain practical insights into operating system scheduling

Start experimenting with different scheduling scenarios and discover how various algorithms handle process execution in real-time!

Select Algorithm

Process ID Arrival Time Burst Time Priority Completion Time TAT WT RT Actions

Simulation Results

Average Waiting Time
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Average Turnaround Time
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CPU Utilization
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Context Switches
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Process State Visualization

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Ready Queue State

Process Scheduling Algorithms

First Come First Serve (FCFS)

FCFS is the simplest scheduling algorithm that executes processes in the order they arrive in the ready queue. It follows a non-preemptive approach where each process runs to completion.

Advantages
  • Simple and easy to implement
  • No starvation as each process gets a fair chance
  • Minimal scheduling overhead
  • Suitable for batch systems
Disadvantages
  • High average waiting time
  • Not suitable for time-sharing systems
  • Poor response time for short processes

Shortest Job First (SJF)

SJF selects the process with the shortest burst time for execution. It can be preemptive or non-preemptive, minimizing average waiting time.

Advantages
  • Optimal for minimizing average waiting time
  • Efficient for batch processing
Disadvantages
  • Requires knowledge of future burst times
  • Can lead to starvation of longer processes

Shortest Remaining Time First (SRTF)

SRTF is a preemptive version of SJF, where the process with the shortest remaining time is selected for execution.

Advantages
  • Minimizes average waiting time
  • Responsive to short processes
Disadvantages
  • Complex to implement
  • Can cause starvation

Priority Scheduling

Processes are scheduled based on priority. Higher priority processes are executed first, which can be preemptive or non-preemptive.

Advantages
  • Flexibility in process management
  • Efficient for critical tasks
Disadvantages
  • Can lead to starvation of lower priority processes
  • Requires careful priority assignment

Round Robin (Time Slice Algorithm)

Round Robin assigns a fixed time quantum to each process in the queue, cycling through them. It's also known as the Time Slice Algorithm.

Advantages
  • Fair time allocation
  • Responsive to all processes
  • Suitable for time-sharing systems
Disadvantages
  • Can lead to high context switching overhead
  • Performance depends on time quantum size