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Experience and techniques used at RTCC to analyze computer system performance have evolved through long exposure to the problem of assuring workable system designs or problem sohtions. The original development of the techniques discussed in this paper .began in mid-1963 for use with Gemini systems and the 7094-11. When probIems in computer size or speed arose, new computers were simulated. When I/O devices caused delays in processing, different I/O devices were simulated to improve performance. When programming design seemed inefficient (either control or application programs), new designs were modeled. Results of these studies were presented for management decision.
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