Solution FCFS
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Solution FCFS

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Solution of example by using the FCFS rules:

    The FCFS sequence is simply A-B-C-D-E. The "flow time" in the system for this sequence measures the time each jobs depends waiting plus being processed.

Job Sequence Processing Time Flow Time Due Date Delays
A 6 6 8 0
B 2 8 6 2
C 8 16 18 0
D 3 19 15 4
E 9 28 23 5
  28 77   11

The First Come First Serve rule results in the following measures of effectiveness:

Average completion time   = total flow time / no. of jobs
                                         = 77days / 5
                                        = 15.4days
Utilisation     = total processing time / total flow time
                     = 28days / 77days
                    = 36.4%
Average no. of jobs   = total flow time / total processing time
                                = 77days / 28days
                                = 2.75 jobs
Average job delays = total delays days / no. of jobs
                                = 11days / 5
                                = 2.2days

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