A Note On Performance of Vm370 in the Integration of Models And Databases
A Note On Performance of Vm370 in the Integration of Models And Databases
John J Donovan
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Various performance studies of VM's are available in the literature [Hatfield, 1972; Goldberg, 1974]. We report here on a theore- tical analysis and in the next section on the practical implications of the degradation of response time as a function of the number of modeling machines. The direction of this work can be seen by considering a config- uration as in Figure 1, where several modeling facilities, each running on a separate virtual machine, are accessing and updating a database that is m...anaged by a database management system running on its separate virtual machine. What is the degradation of performance with each additional user? What determines the length of time the database machine takes to process a request? What is the best locking strategy? An access or update to the database machine may be initiated either by a user query, which would be passed on by the modeling machine, or by a model executing on the modeling machine. In either case, the database machine, while processing a request, locks out (queues) all other requests.
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