Some experiments in simulating OS/360 from performance data
Leonard J. Bass, Thomas Santos, Michael Sheets · 1974
Recent work has indicated that the time a program spends in memory is the primary determinant of the turnaround of the program. We constructed a simulation model of our OS/360 system, using as input performance data gathered by a software monitor, and experimented with differing models of the operating system, program behavior, and hardware configurations to determine an appropriate trade-off between the complexity of models used and the accuracy of the simulation. We constructed a fairly simple model which simulated, from resource requirements of programs, the time a collection of programs resided in memory to within 10% accuracy for the actual completion time of the various programs.