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The problem involves scheduling three processes \(P1\), \(P2\), and \(P3\), and their characteristics are summarized in the table provided:

| Processus | Temps d'exécution | Temps d'E/S | Temps d'exécution | Temps d'E/S | Temps d'exécution | Priorité |
|-----------|-------------------|-------------|-------------------|-------------|-------------------|----------|
| P1        | 2 unités          | 5 unités    | 5 unités          | 1 unité     | 1 unité           | 3        |
| P2        | 9 unités          | 1 unité     | 1 unité           | 0 unité     | 0 unité           | 1        |
| P3        | 5 unités          | 2 unités    | 1 unité           | 5 unités    | 1 unité           | 2        |

We are asked to:

1. **Perform a FIFO (First In, First Out) scheduling** based on increasing process numbers.
2. **Perform a priority-based scheduling with preemption** (the lower the priority number, the higher the priority).

### Assumptions:
- All processes start at \(t=0\), and the input/output (E/S) operations can overlap with execution.

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#### For FIFO Scheduling:
- Processes are scheduled in the order \(P1 \rightarrow P2 \rightarrow P3\), without considering their priority or execution details.

#### For Priority Scheduling with Preemption:
- The scheduling must prioritize processes based on their given priority numbers, allowing preemption if a higher-priority process arrives during execution.

Would you like me to walk through the detailed solution for each scheduling strategy step by step?

### Follow-up Questions:
1. How does FIFO scheduling work when processes have different I/O times?
2. What is the role of preemption in priority scheduling?
3. How can we calculate the total time for process completion in both scheduling methods?
4. In priority scheduling, what happens if two processes have the same priority?
5. What happens if we adjust the starting times of the processes?

### Tip:
When simulating scheduling algorithms, it’s essential to maintain a timeline chart to track which process is executing at each time step, especially when dealing with I/O operations and preemption.

Effectuer un ordonnancement en FIFO et un ordonnancement par priorité avec préemption pour les processus P1, P2, et P3 caractérisés par leur temps d'exécution, temps d'E/S, et priorité.

Learn how to perform FIFO (First In, First Out) scheduling and priority-based preemptive scheduling for three processes (P1, P2, and P3). This example includes process execution time, I/O time, and priority values. Perfect for students learning about scheduling algorithms in operating systems.

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