https://file.aiquickdraw.com/mathbot/file/1725898179460iy7a22m6.jpg

The image shows a scheduling problem for three processes (P1, P2, and P3). It is asking for three different scheduling techniques: 

1. **First In First Out (FIFO)**.
2. **Priority without preemption**.
3. **Priority with preemption**.

Each process has the following parameters:

- **P1**: 
  - Execution Time: 2 units
  - I/O Time: 2 units (at time 3)
  - Priority: 3

- **P2**:
  - Execution Time: 4 units
  - I/O Time: 3 units (at time 2)
  - Priority: 2

- **P3**:
  - Execution Time: 2 units
  - I/O Time: 1 unit (at time 2)
  - Priority: 1

Now, I will explain and fill each of the tables for the scheduling strategies:

### 1. FIFO (First In First Out):

In FIFO, the processes are scheduled in the order they arrive, without considering priority. Since all processes can start at the same time (t=0), the scheduling will follow the order of P1, P2, and P3.

- **P1** starts at time 0 and runs for 2 units, finishing at time 2.
- **P2** starts at time 2 and runs for 4 units, finishing at time 6.
- **P3** starts at time 6 and runs for 2 units, finishing at time 8.

This will look like:

```
P1: ████
P2: ████████████
P3: ████████
```

### 2. Priority Scheduling without Preemption:

In this case, we schedule processes based on their priority. Since P3 has the highest priority (1), it will go first, followed by P2 (priority 2), and P1 (priority 3).

- **P3** starts at time 0 and runs for 2 units, finishing at time 2.
- **P2** starts at time 2 and runs for 4 units, finishing at time 6.
- **P1** starts at time 6 and runs for 2 units, finishing at time 8.

The output will be:

```
P3: ████
P2: ████████████
P1: ████████
```

### 3. Priority Scheduling with Preemption:

Here, the processes are scheduled based on their priority, but a higher-priority process can preempt a lower-priority process if it becomes available.

- **P3** starts at time 0 and runs for 2 units, finishing at time 2.
- **P2** starts at time 2 and runs for 1 unit. After 1 unit (at time 3), **P1** becomes ready, but since P2 has a higher priority than P1, it continues running for its remaining 3 units, finishing at time 6.
- **P1** starts at time 6 and runs for 2 units, finishing at time 8.

This will result in:

```
P3: ████
P2: ████████████
P1: ████████
```

Would you like any additional details on how these schedules were determined?

---

Here are 5 questions related to this concept:

1. How does the priority-based preemptive scheduling differ from non-preemptive?
2. What is the main advantage of using preemptive scheduling over FIFO?
3. How do I/O wait times influence scheduling decisions in a real-world system?
4. What happens when two processes have the same priority level in priority-based scheduling?
5. How could round-robin scheduling be applied to the same set of processes?

**Tip**: Preemptive scheduling allows more important (higher priority) tasks to execute earlier, but it can lead to more frequent context switches, which might reduce efficiency.

Fill the last 3 tables based on scheduling processes P1, P2, and P3 with FIFO, priority without preemption, and priority with preemption.

Understand how to schedule processes P1, P2, and P3 using First In First Out (FIFO), priority scheduling without preemption, and priority scheduling with preemption. This guide covers core concepts of scheduling algorithms in operating systems.

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