The working set model for program behavior
Communications of the ACM
Performance evaluation in network computers
ANSS '73 Proceedings of the 1st symposium on Simulation of computer systems
Performance evaluation in network computers
ANSS '73 Proceedings of the 1st symposium on Simulation of computer systems
Quasi-real simulation as a tool for the implementation of modular computer systems
ANSS '79 Proceedings of the 12th annual symposium on Simulation
Using simulation to evaluate system performance
DAC '74 Proceedings of the 11th Design Automation Workshop
Dynamic dispatching in job class scheduled systems
AFIPS '75 Proceedings of the May 19-22, 1975, national computer conference and exposition
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In this paper we present some results obtained from using simulation as a tool for evaluating alternative methods of improving system performance in network computers. We begin by describing a GPSS model which was developed to evaluate the current computer center operations at the University of Illinois. While using actual data from the center to verify that the model accurately predicts each job's total time in the system, we evaluate the resource utilization within the center. Then we use the simulator to show that a proposed dynamic priority assignment algorithm yields better throughput than the existing algorithm while maintaining a higher level of CPU and memory utilization. Next, turning our attention to a hypothetical network of three centers, we use a generalization of our model to demonstrate the effects of load leveling between centers on the total system throughput. Here we also explore the merits of “pay-for-priority” schemes in both a single center and in a network of three centers. Finally, we discuss the process of tuning the simulator model to the real world system including the problems of benchmark data generation and system parameter determination.