Simulation Using GPSS
Simulation Modeling and Analysis
Simulation Modeling and Analysis
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International Business Machines' (IBM) Job Entry Subsystem 3 (JES 3) is the integral part of the MVS operating system that is responsible for controlling all jobs from their entry into the system until their exit out of the system. JES 3 maintains total awareness of each job while it is in the system and services the jobs upon request. These services include: prearing the job for execution, selecting the job for execution, and the processing of SYSIN/SYSOUT data. This paper reports the findings of the performance evaluation study of JES 3 through the use of a General Purpose Simulation System (GPSS) model of JES 3 and exhibits the benefits of using simulation models to study complex sytems such as JES 3. Once the model was developed, it was used to evaluate the effects of varying the job scheduler parameters of JES 3 in the batch job environment. The input workload and service times for the model were derived from System Management Facilities (SMF) and Resource Management Facilities (RMF) data from the modeled system.