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advantages and disadvantages of longest processing time
If the shortest Processing time is for a 1st activity, schedule that job in the earliest Johnson's Rule Example: Vicki's Office Cleaners does the annual major
Jobs with the shortest processing time are scheduled first. Example: Machine shop has 5 unprocessed jobs (J1, J2, J3, J4, J5) numbers by order they entered
13 Sep 2016
19-2 Example of Job Sequencing: Shortest Processing Time Suppose we have the four jobs to the right arrive for processing on one machine Jobs (in order of
n Shortest processing time (SPT): Jobs are sequenced in order of the processing time required at the workstation, with the job requiring the least processing time at the workstation scheduled first. Additional criteria include: average wait time, average total completion time, and variance in completion times.
Shortest Processing Time (SPT) Earliest Due Date of priority rules. Average Completion time/Mean flow time =(Total processing time + total waiting time)/Number of jobs. Average lateness = total late days/number of jobs. Example. Given:
Find the flow time, tardiness and lateness for each job if they are processed in a) order A-B-C-D-E b) order of Shortest processing Time c) Order in Earliest Due
The second step is sorting out the shortest processing time among the jobs. Thirdly, calculate the flow time of each job by using the processing time. the flow time is the Example with Demo Solution by using the Priority Rules Example of SPT
The results depend on the rule which is chosen. In our first example we have chosen shortest processing time but in going through the examples all of the information which will be displayed is explained. Flow time. The time at which each job ends is given in a column of flow times.
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