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Performance Engineering Series – Tuning for Performance - Case Study – 5

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  JDK Nuances JDK upgrades is one of the most discussed topics as it is something that just cannot be changed without looking in to the code. This problem becomes more evident for large enterprise class applications. Despite the advances in JDK releases providing various optimizations / newer features, JDK8 we can still find JDK8 in being widely used.   This can perhaps be related to the development effort needed to upgrade the underlying code.   Even after taking the step of upgrading   / recompiling the code on newer JDK’s like JDK11, there still come some issues which arise due to the enhancements and we will look at one such instance today in this brief blog post.   To give a brief background this application is used for Indexing / Searching and uses Lucene to perform this task as I have described in the previous blog posts.    But one change from the previous posts was that the JDK was upgrade to JDK11 from JDK8 after which this particular...
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Performance Engineering Series – Tuning for Performance - Case Study - 1

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Introduction This series of articles will introduce the reader to explore more about Performance Engineering, specifically how to deal with actual issues of the product in a production deployment scenario.   This is the most discussed area and most of the people I have interacted with look forward to getting in to this role and deal with actual issues and make their contribution.   This work requires knowledge and understanding from a multitude of aspects like –        The product design         Usage profile of the product         CPU and Memory and Disk configuration of the platform         Software configuration – Memory settings         Connected software components and their impact The reader is expected to look at the problem holistically to make the best use of the resources being deployed and then tune the application to obtain the required performance.   As t...
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Performance Engineering Series – Tuning for Performance - Case Study – 3

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A curious case of continuous Full GC’s with G1GC Introduction Continuing on the previous articles where I had explained about tuning a JVM and the parameters involved, this article specifically deals with a curious case of the same JVM dumping out some unexpected messages in the logs during internal tests, the investigation and the final outcome.  Readers are expected to browse through the previous articles to get a better context of what is being discussed here.  The performance test environment consists of a replica of the entire setup in an exact similar architecture to what is deployed in production.  The test engineers do extensive tests in different conditions to simulate production conditions and to understand the behavior of the application in various conditions.  For first time readers let me (re)introduce the application under discussion -  This particular application is responsible for Indexing and Search for the entire data that lives in ...
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