15+Scheduling - SCHEDULING SCHEDULING...

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SCHEDULING SCHEDULING Priority Rules for Dispatching 1)First Come First Served (FCFS) 2)Shortest Processing Time (SPT) 3)Earliest Due Date (EDD) 4)Longest Processing Time Examples: Jobs Time t 6 2 8 3 9 Due date 8 6 18 15 23 A B C D E
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SCHEDULING SCHEDULING Assume  the  letters  are  assigned  in  the  order  the  jobs  arrived. FCFS Schedule: ABCDE Jobs t Flow time Due date Lateness 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 Total 28 77 11
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SCHEDULING SCHEDULING Average cycle time = ( flow times)/(# of jobs)     = 77/5 = 15.4 days. Utilization             =  ( job times)/ ( total flow time)                            = 28/77 = 0.364 or 36.4%.   Avg. # of Jobs in the system=  ( total flow time)/ ( job times)                                                                        = 77/28 = 2.75 jobs. Average lateness = (total days late) / (# of jobs)                   = 11/5 = 2.2 days.
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SCHEDULING SPT Schedule: BDACE Jobs t Flow time Due date Lateness B 2 2 6 0 D 3 5 15 0 A 6 11 8 3 C 8 19 18 1 E 9 28 23 5 Total 28 65 9 Average cycle time = ( flow times)/(# of jobs) = 65/5               = 13 days.  
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This note was uploaded on 10/25/2011 for the course EIN 4401 taught by Professor Staff during the Fall '08 term at University of Florida.

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15+Scheduling - SCHEDULING SCHEDULING...

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