Here is the example from paper called "Application Signature: A Way to Identify, Quantify and Report Change" which s presenting today at 4 pm by Richard Gimarc from CA Technologies, Inc and Kiran Chennuri from Aetna Life Insurance Company:
'...We readily admit that we are “standing on the shoulders of giants”; leveraging the work of others in the field to develop our own interpretation, implementation and use of an Application Signature....
... Perhaps the most influential work is by Igor Trubin. Starting in 2001, Trubin built on the ideas proposed by Buzen and Shum to develop the Statistical Exception Detection System (SEDS). Basically, SEDS “is used for automatically scanning through large volumes of performance data and identifying measurements of global metrics that differ significantly from their expected values”. Again, we see common ground with our use of an Application Signature. The points we leverage from Trubin’s work are:
- Identify when performance metrics exceed of fall below expectation
- Note and record the exceptions
- Estimate the size of each exception rather than just recording its occurrence
- Use control charts as a visual tool for examining current performance versus expected performance
What do you do when a change is identified?
- Quantify the change. Does your current measurement exceed the Signature by 5%, or 100%? We are considering implementing a technique similar to what was described by Trubin.
- Grade the change as either good or bad. If a metric increases, is that an indication of a bad change? Not always. Consider workload throughput; an increase in workload throughput is probably a good change. We need to find a way to customize each Application Signature metric to recognize and highlight both good and bad changes.
- Develop a historical record of changes. Again, this is an idea developed by Trubin. A historical record will provide the application development and support staff with a quantitative description of sensitive application characteristics that may warrant improvement.
Some other anthers' work are referenced. I need to read that carefully and will report here about that in the other posts. Looking forward to attend that presentation!
Richard and Kiran, thank you for referencing my work!
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