Question

FCFS Gantt Chart with Completion Times

Answer 1

Certainly! To create a Gantt chart for the First-Come, First-Served (FCFS) scheduling algorithm, we'll need a set of processes with their arrival times and burst times (the time required to complete the process).

### Example Scenario

Let's consider the following processes:

| Process | Arrival Time | Burst Time |
|---------|--------------|------------|
| P1 | 0 | 4 |
| P2 | 1 | 3 |
| P3 | 2 | 1 |
| P4 | 3 | 2 |

### FCFS Scheduling

In FCFS, processes are executed in the order in which they arrive. Based on the example above:

1. **P1** arrives at time 0 and starts executing immediately.
2. **P2** arrives at time 1 but will wait until P1 finishes.
3. **P3** arrives at time 2 and will also have to wait.
4. **P4** arrives at time 3 and will be executed after P2.

### Gantt Chart

The execution is as follows:

1. **P1** executes from time 0 to time 4 (0 + 4).
2. **P2** starts at time 4 and executes until time 7 (4 + 3).
3. **P3** starts at time 7 and finishes at time 8 (7 + 1).
4. **P4** starts at time 8 and finishes at time 10 (8 + 2).

The Gantt chart will look like this:

```
| P1 | P2 | P3 | P4 |
0 4 7 8 10
```

### Completion Times

Now let’s calculate the completion time for each process:

- **Completion Time of P1**: 4
- **Completion Time of P2**: 7
- **Completion Time of P3**: 8
- **Completion Time of P4**: 10

### Summary of Completion Times

| Process | Completion Time |
|---------|-----------------|
| P1 | 4 |
| P2 | 7 |
| P3 | 8 |
| P4 | 10 |

This concludes the representation of the FCFS Gantt chart and the completion times for the given processes. If you need a different set of processes or further details, feel free to ask!