Once the function, behaviour type and usage pattern data have been provided the model starts to produce useful information based on its estimations. The most important of this is the daily function usage estimation. This information is presented on the “Estimated Function Demand” sheet within the model, and provides as estimate, by year, of the average daily usage for each function. This is then used to provide an estimate of the average and peak operations per second for the system. Read the rest of this entry »
Example: User demand estimation
April 16, 2007
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The generic system performance profile
April 11, 2007
Generic Performance profile graph
When drawing a graph of the response time performance of a system with increasing load it will usually follow a standard profile, namely:
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A very low load increasing the load will actually improve the performance of the system slightly. This is because most systems use various caching mechanisms and if there is too little load none of the caches will have data in.
- As the load increases a near flat region will be experienced, where all requests act as if they have near dedicated resources available to them. Read the rest of this entry »
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