Multi-Class Analytical Models of the DECsystem-10 Job-Swapping Behavior

摘要

An improved model of the DECsystem-10 job-swapping behavior was developed. This model combines a previously developed closed queueing network model with a job-swapping model developed by Chen. Chen's swapping model provides an approximate solution to a network queueing model with a state-dependent probability transition. This combined model is then tested on a hypothetical, though realistic workload containing both interactive and batch jobs. The two classes of jobs are treated first as separate classes, as one class having the weighted average job characteristics of both classes, and as one class having just the interactive job characteristics. The results of these experiments and a comparison between Chen's swapping model and the classical are presented. The results of the experiment indicate that it is important to model multiple classes for systems which have a significant amount of batch activity.