METHOD AND APPARATUS FOR FORECASTING SYSTEM PERFORMANCE BY GRAPHIC EXPRESSION

PURPOSE:To attain efficient forecasting job by inputting the standby time from the standby of resource to its security and the occupied time from the security of the resource to its release in a form of independent graphs and in a form allowing the inclusiveness between the graphs, and calculating the performance together with parameter information. CONSTITUTION:The standby time from the waiting for the resource to its security of a system model of a forecast object is inputted to a graphic input device 1 in a form of, e.g., a rhombus, and the occupied time from the security of the system resource to its release is inputted thereto in a form of, e.g., a rectangular and also as the nesting structure represented by a rectangular 28, and they are displayed on a graphic output device 2. An English character or numeric or other symbols are inputted to a parameter input device 3 and displayed on a graphic output device 4. A forecast device 5 calculates the performance of the system model from the graphs of the device 1 and the information of the device 3 and they are displayed on a graphic output device 6. Thus, the standby and occupancy of the system resource are combined visually and the system model is described simply and sufficiently make the forecasting job efficient.