Probability Models for Multiprogramming Computer Systems
Journal of the ACM (JACM)
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The flow time of a job is the total time it spends in the computer system--from the time it is recognized to the time it is purged. The mean flow time is used to measure the service capability of a data processing shop because, the smaller the mean flow time, the more jobs that can be processed within a period of time. Since the progress of program development in a batch environment depends on the number of shots each programmer can have, a system management objective is to identify the factors which are essential to the flow time and ensure that the system is running optimally at all times.