As Donald Knuth says: "Programmers waste enormous amounts of time thinking about, or worrying about, the speed of noncritical parts of their programs, and these attempts at efficiency actually have a strong negative impact when debugging and maintenance are considered. Gather data, analyze it and create hypotheses: then test your hypotheses. ![]() The first step, however, should be to use and be guided by the tools and methodologies. We will highlight the most common tuning knobs that can often improve the speed of the average application by 200% or more relative to the default configuration. Performance tuning is usually about focusing on a few key variables.The following recipe is for the whole cookbook: General Performance RecipeĮvery major section of this cookbook will have a recipe summarizing the key points. Thank you to the IBM managers that helped support this project: Prasad Imandi, Dave Schell, Barry Foster, Melissa Modjeski, Keri Olson, Frank Schembari, Michael Stuy, Mike Morin, Sree Ratnasinghe, and others. Government Users Restricted Rights: Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corporation. Note: Before using this information, read the Notices section for information on terms of use, statement of support, trademarks, etc.Ĭopyright International Business Machines Corporation 2021. The nature of performance tuning is that 80% of the time, you should focus on a few key things, but 20% of the time you may need to deep dive into a very specific component. A large portion of the cookbook is more of a reference book. In general, this book is not intended to be read end-to-end. Detailed chapters and sub-chapters such as WAS, Java, etc. ![]()
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