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Discuss queuing behavior and queuing discipline.

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  • Queuing behavior: It refers to action of customers while in a queue waiting for a service to begin. In some situations, there is possibility that incoming customers will Back (leave when they see that the line is too long), Renege (leave after being in line when they see that line is moving too slowly) or Jockey (move from one line to another if they think have chosen a slow line).
  • Queuing Discipline: It is the logical ordering of the customers in a queue and determines which customers will be chosen for service when the server become free. Common queuing discipline include: 
    • First In First Out (FIFO) 
    • Last In First Out (LIFO) 
    • Service In Random Order (SIRO) 
    • Shortest Processing Time First (SPTF) 
    • Service According To Priority (SATP).

In some jobs, queue discipline are based on due date and on expected processing time for the job.
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