GAPP version 2 will be present at HOTSOS 2011

The last couple of months I have worked very hard on method GAPP and have finally made a very big improvement to it. In the past GAPP was only able to pin point where in the architecture the biggest variance in response time was caused. The improvement to GAPP makes it now also possible to find within certain error also the service time per measured component in the architecture. The point is that sometimes the component causing the biggest variance in end user response time is not always the component responsible for the most service time of the total response time.

The second version of GAPP has now an extra step inside the method, which is “data modeling”, the data is first modeled by using normalized response times for different amount of servers by using the Erlang C formula. Next to this data mining is used with a generalized linear model and ridge regression, to solve near collinearities in the data. With this extra step in place the prediction of service time and wait time per measured component became possible. When I first verified it against real system data I was really happy to find out that it works very well. More information will follow soon in blogs and hopefully for the end of this year in a white paper.

I am very happy I get the opportunity from Hotsos to be able to present it next year in march 2011. Via this way I also like to thank everybody who inspired me and made this possible, especially Cary Millsap and Dr. Neil Gunther.

The link to the presentation abstract:



GAPP Performance Method at HOTSOS 2009

For some months ago (october 2008) I wrote an abstract for a paper to present at the HOTSOS 2009 symposium. Although I hoped I was selected to give the presentation, I was not selected by Hotsos. This was a pitty but looking at the people and the presentations who made it to the agenda of the HOTSOS 2009 symposium, it would have been very special to be there also. Due to the high quality of the sysmposium and the fact that it is the place to be for every performance geek out there, I planned together with my collegae Marco Gralike a trip to the symposium this year only as an attendee.

Last week I received unexpectedly an email from Cary Millsap with a very special opportunity within. Cary asked me if I was still interested in presenting at the comming symposium and although very little time I said of course YES. So although late I was added to the HOTSOS 2009 symposium agenda to give a presentation called “Practical Use of Method Gapp to Find Performance Bottlenecks for Business Processes in Complex Architectures”

I hope personal that I will give a presentation wich will be equally or even more interresting than the one I gave at the HOTSOS Symposium 2008. As a last word I really like to thank Cary Millsap for this opportunity.

Regards, Gerwin

Miracle Benelux organizes MasterClass with Cary Millsap and Jeff Holt

Below the advertisement of the Miracle Benelux (Anjo Kolk) event.

Miracle Benelux logoThe extreme Oracle Specialists

Wednesday 10th, December 2008

Miracle MasterClass with the ORACLE PERFORMANCE SPECIALISTS — Cary Millsap and Jeff Holt –, 20-21-22 Jan 2009

NL Versie
Wilt u meer leren over hoe u uw Oracle Database beten kan laten performen?
Met veel trots kan Miracle Benelux aankondigen dat
Cary Millsap en Jeff Holt van Method-R naar Nederland komen om hun
Oracle Performance MasterClass te geven. De kosten voor deze MasterClass bedraagt 1599 Euro. Echter ontvangers van deze mail kunnen boeken met een aantrekkelijke “kredietcrisis” korting van 300 euro.
Voer in het registratie formulier bij opmerkingen in –> Mailaanbieding. Dan kunt u deelnemen aan de MasterClass voor
maar 1299 euro
. Deze mailaanbieding is geldig t/m 29 december 2008. Als u ook erbij wilt zijn kunt u via onze website registreren of de agenda bekijken Agenda MasterClass 2009 » Voertaal bij de Masterclass is Engels. Lees meer »
Englisch version
Do you want to learn how to get your Oracle Database to perform better?
Miracle Benelux is proud to present that
Cary Millsap and Jeff Holt from Method-R are coming to the Netherlands to give their
Oracle performance MasterClass . The costs for this MasterClass will be 1599 Euro. However receivers from this email can book with a very nice creditcrisis discount of 300 euro. To get this discount enter in the field “opmerkingen” in the registration form –> Maildiscount. Then you can join us for the nice price of 1299 euro . This mail offer is only valid until 29 of december 2008. If you want to be there and join us for a great MasterClass then register through our website or Click here for the registration form. The form is in Dutch if you encounter any problem just email us at and we will help you! Read More »
Quote from a former student of Cary and Jeff
In 2002 (June 11-13), I took the Hotsos class taught by Jeff Holt and Cary Millsap and am very interested to see them teaching together again. In the past 6 years I have benefitted tremendously from what I learned.
Agenda MasterClass 2009 »
What is Method R?
Method R is a fast, effective, commonsense approach to optimizing a system. It was first documented in the book Optimizing Oracle Performanceby Method R founding members Cary Millsap and Jeff Holt. Read More about Method-R»


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