Senior Project - CraytoR

To improve the performance of the CRAY X/MP running UNICOS, it is necessary to understand the scheduling of processes. Although parameters in the current scheduler can be altered and subsequent performance monitored, there are a number of drawbacks with this approach. The job mix is continuously changing, and it is difficult to determine the true effect of changes. To keep the job mix constant with this approach would require dedicated machine time which is not practical. Also the details of the process scheduling need to be monitored closer than allowed by this approach. It might also be necessary to alter the scheduling algorithm itself, which could cause considerable disruption in the real time environment. The goal of this project was to develop an event driven job scheduler simulator based on the actual job scheduler code from the X/MP, which could be used to study the behavior of UNICOS scheduling.