Question

Draw a Gantt chart that shows the completion times for each process
using first-come, first-served CPU scheduling.

Answer 1

While I can't literally draw a Gantt chart here, I can explain how to create one based on first-come, first-served (FCFS) CPU scheduling. Here's a step-by-step guide you can follow, along with a simple example.

1. **List your processes:** Identify the processes you need to schedule along with their burst times (time required for execution).

For example:
- Process P1: Burst time = 4
- Process P2: Burst time = 3
- Process P3: Burst time = 5
- Process P4: Burst time = 2

2. **Calculate the completion time for each process:** In FCFS scheduling, processes are executed in the order they arrive. If we assume they arrive in the order P1, P2, P3, and P4:

- Completion time of P1 = 4 (starts at 0, ends at 4)
- Completion time of P2 = 4 + 3 = 7 (starts at 4, ends at 7)
- Completion time of P3 = 7 + 5 = 12 (starts at 7, ends at 12)
- Completion time of P4 = 12 + 2 = 14 (starts at 12, ends at 14)

3. **Create the Gantt chart:** You can represent the execution time visually. Here’s how it would look based on the above example:

```
| P1 | P2 | P3 | P4 |
0 4 7 12 14
```

4. **Interpret the chart:** Each labeled section represents the time slice during which each process is executed. You should also be able to calculate metrics such as Turnaround Time and Waiting Time if needed.

### Example Gantt Chart Representation
```
0 4 7 12 14
| P1 | P2 | P3 | P4 |
```

To draw this out, you can use a piece of paper or a digital drawing tool to create the bars representing each process over time.