By Rosen Saul

The scope of the dialogue is proscribed to particular types of common function computing structures whose features contain multiprogramming, multiprocessors, verbal exchange traces serving many clients, and online terminal platforms. The target is to realize a greater realizing of computing structures in the course of the recommendations of size and function overview.

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Additional resources for Lectures on the Measurement and Evaluation of the Performance of Computing Systems

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Even when internal data shows that average response time is poor, it is possible, indeed even probable, that most users who are creating and editing small job files and occasionally submitting jobs to be run are getting better than adequate response. At the same time the student who is trying to complete a CAI (Computer Assisted Instruction) assignment in a half-hour segment of real time may find the response intolerable. 3. The system console. Among the innovations in large computer design introduced by the CDC 6000 systems, one very interesting one was the use of a twin cathode ray tube console driven by display programs in the system's peripheral processors.

The 6400 system is a separate computer with its own central memory and its own central processor and peripheral processors and channels. Thus there are really two distinct systems of the type illustrated in Fig. 1. In normal operation the 6500 runs two time-sharing processes and handles all on-line and remote computing activities, and the two systems share in the processing of user jobs. Measurement and analysis efforts are complicated by the fact that the two systems share a number of peripheral storage devices, and each may thus cause access delays for the other.

The S or secondary tables show the distribution of other parameters into these same classes. 5% of all input/output was done for the 16 jobs that used more than 512 seconds of central processor time. At the bottom of the table there are summary statistics that show means and standard deviations, etc. 55 seconds. This very large standard deviation, relative to the mean, is typical of service time distributions encountered in many computer performance studies. 6 is a summary report that gives a great deal of information about the total resources used by the system, and about the amounts of system resources used by the average job.

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