Compares the results of the preimplementation simulation of the Video Graphic System, described in R-519 and R-696, with later hardware monitoring of the actual system. The earlier study revealed the complexity of the hardware/software interactions and the resultant inability to give simple, quantitative performance predictions. This was confirmed by the hardware study. General conclusions are: (1) Detailed simulation analysis is very useful in system design and implementation. (2) Simulating alternatives leads to better understanding of their differences. (3) Simulation is likely to reveal unexpected characteristics and interactions. (4) For determining system response, monitoring normal operations is less useful than running controlled tests with a known load. (5) In complex online systems, simulation results are likely to have significant quantitative errors, though qualitatively valid. (Presented at an ONR-SDC technical symposium, November 1971.)
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