Abstract
Figure 4 shows an example of modelling of a time-sharing system at a crude level where two functions: the processing and the roll-in or roll-out routines have been expanded into subgraphs.
In his models the author has chosen to put the emphasis on the parallelism of tasks, the synchronization of processes and the influence of resource sharing and his graphical representation was designed to express these features in the most convenient way.
The description presented in this article was intended to show the main difficulties of an actual implementation of the simulator on a computer system and anyone whishing to go into the details of the formalization should refer to [13] or [14].
Although this model was developped with the idea of a computer implemented simulator, the author has shown (see [13], [15], [16], [17]) that the Control Graph Models are also very useful as analytical tools for the evaluation of systems. In particular synchronization problems and resource deadlocks can be probed and some performance evaluation can be obtained quite easily in some cases.
It is hoped that further research will extend these capabilities so that new and better designed systems will be produced because their Control Graph Models were carefully constructed and thoroughly analysed and understood.
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Parent, M. (1974). Presentation of the control graph models. In: Gelenbe, E., Kaiser, C. (eds) Operating Systems. OS 1974. Lecture Notes in Computer Science, vol 16. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0029365
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DOI: https://doi.org/10.1007/BFb0029365
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