Seprate the queuing time from the process time

Posted on 2014-08-19
Last Modified: 2014-08-31

I have data for a process in such system which has is like that
Arrival time       end of process time                        

I have calculate the inter-arrival time between arrives and time between process and arrival which represents the waiting and process time. My question is how to know the process time and waiting time for each task.

Example for ten tasks:
inter-arrival time in hours     waiting                    process               time between arrivals and end of process
0                                                   0                             2.18 (as first one)           2.18
0.73                                               ?                              ?                                    1.50
0.03                                               ?                              ?                                     9.04
0.72                                               ?                              ?                                     3.79
0.13                                                                                                                     9.31
0.17                                                                                                                    1.94
0.53                                                                                                                    0.94
0.74                                                                                                                    4.32
2.93                                                                                                                    3.93
1.47                                                                                                                    4.45

how to calculate proceed and waiting time for each task ?
Question by:amq10
    LVL 6

    Expert Comment


    If I understand what you are asking, it is easier done with the Arrival time and End of Process time.
    Can you post the original data?


    Author Comment

    Hi John,
    Thanks for your comment. The deference between end of process and arrival will gives the process time and waiting time together. I need to know long the task takes in the process and in the waiting queue.

    Please find the attached, which  is a sample of the original data. Please note that the difference there are holidays and weekends between arrival and process have been removed in the processed times in the last two columns .

    LVL 6

    Assisted Solution


    Are these processes sequential?
    I have assumed yet, and done some calculations, but it is not making sense.

    I don't see any attachment on your previous post.


    Accepted Solution

    Thanks John for your reply. Actually, your calculation has a problem. That will be clear if you add the waiting time with  process time for each task will give different number,as you put the process time like the total. Andy way. I have sort it out. by doning this calculation

    = (waiting time for second task - inter arrival of the second task)+ (total time of task1-waiting time of task1)


    Author Closing Comment

    I have add the solution as I found it and selected it as the best solution. Although, the expert solution it doesn't work, I gave his the point as I respect his effort with me.

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