Real-time scheduling algorithms like Rate Monotonic (RM) and Earliest Deadline First (EDF) are used to manage task execution in systems with strict time constraints. These algorithms ensure tasks meet their deadlines, a critical aspect for real-time applications.
- Fixed Priority: Tasks with shorter periods have higher priority.
- Preemptive: Higher priority tasks can interrupt lower priority ones.
- Utilization Bound: Can schedule tasks if CPU utilization is ≤ 69.3%.
- Use Case: Best suited for systems with periodic tasks and moderate CPU utilization.
- Dynamic Priority: Tasks with the closest deadline have the highest priority.
- Preemptive: Tasks with earlier deadlines can preempt ongoing tasks.
- Optimal: Can fully utilize CPU (up to 100%).
- Use Case: Ideal for systems with high CPU utilization and both periodic and aperiodic tasks.
| Feature | Rate Monotonic (RM) | Earliest Deadline First (EDF) |
|---|---|---|
| Priority | Fixed | Dynamic |
| Utilization Bound | 69.3% | 100% |
| Complexity | Simple | More complex |
RM offers simplicity but lower CPU utilization, while EDF is more complex but optimal for high-performance systems. The choice depends on system requirements and resource needs.