3.12 Summary

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3.12 Summary

In this chapter we briefly described some of the fundamental concepts required to initiate the analysis of computer systems. The first dealt with the basic concept of time and how this unit can be used as a fundamental means to measure performance. This description was then followed by a description of the definition of events or actions within a domain. The concepts of time and event were then melded to yield a means to identify points from which to initiate measurement. The methods of measuring a system were then described, focusing on hardware and software monitoring and issues associated with each.

The next step in our investigation was to develop the concept of related actions making up larger actions and the duration of these activities. The duration was defined as the interval of a complex action or the time between successive repetitions of a specified sequence.

With the concept of intervals we could then focus on measuring a sequence of related actions. The focus of this section was to define response time in relationship to a computer system's modeling and performance analysis.

The concept of these complex interactions was addressed next. The concepts of dependent and independent actions were developed. These were then followed by the development of a definition for randomness of such events within a computer system. It was pointed out that this concept of randomness is an important one in simplifying some of our analysis techniques.

This discussion was then followed up with an introduction to the concept of a workload and what it represents in computer systems performance. The final section in this chapter discussed some of the hurdles facing the computer systems analyst in the design, development, operation, and completion of a performance study.



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Computer Systems Performance Evaluation and Prediction
Computer Systems Performance Evaluation and Prediction
ISBN: 1555582605
EAN: 2147483647
Year: 2002
Pages: 136

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