There are previously involved: a program source-into which a log output instruction for adjusting an application model is embedded; a simulation source for performance simulation corresponding to the program source; and initial parameter values for adjusting the application model. Software parts capable of storing a history of parameter values after adjustment are combined to create an application program and the application model. Logs obtained by executing the application program and the application model are compared, and the parameters of the application model are automatically adjusted in conformance with actual measurement results of the application program. The adjusting result is fed back to the application model, and added to the history of original software parts, in which the parameter initial values are changed at need.
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