Our architect Ram Lakshmanan presented a talk on the topic: “GC Tuning & Troubleshooting Crash Course” in JAX London 2019 conference. Talk was very well received by the attendees.
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Recently we experienced an interesting production problem. This application was running on multiple AWS EC2 instances behind Elastic Load Balancer. The application was running on GNU/Linux OS, Java 8, Tomcat 8 application server. All of sudden one of the application instances became unresponsive. All other application instances were handling the traffic properly. Whenever the HTTP request was sent to this application instance from the browser, we were getting following response to be printed on the browser.
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TD Bank (one of the largest bank in Canada) use our products: GCeasy, FastThread and HeapHero.
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In this article, we have attempted to answer the most common questions around System.gc() API call. We hope it may be of help.
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Should I be running my application with few instances (i.e. machines) with large memory size or a lot of instances with small memory size? Which strategy is optimal? This question might be confronted often. After building applications for 2 decades, after building JVM performance engineering/troubleshooting tools (GCeasy, FastThread, HeapHero), I still don’t know the right answer to this question. At the same time, I believe there is no binary answer to this question as well. In this article, I would like to share my observations and experiences on this topic.
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JVM has provided helpful arguments to deal with OutOfMemoryError. In this article we would like to highlight those JVM arguments. It might come handy for you when you are troubleshooting OutOfMemoryError. Those JVM arguments are:
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Troubleshooting OutOfMemoryError or any memory related problem is done in manually even in 2019. Troubleshooting and identifying the root cause of OutOfMemoryError can even be automated, by following below mentioned 3 steps:
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There are a few distinct differences and subtle nuances between 32-bit JVM and 64-bit JVM. We thought we will try to clarify them through this question & answer article
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Confoo montreal is one of the well run, well-attended conference in Canada. This is one of the conferences where they serve 3-course hot lunch meals in a proper dining table with proper silverware :-). Great speakers all around the world, enthusiastic attendees, pleasant ambience (hotel Bonaventure), meticulous organization, beautiful Montreal city – all essential characteristics to make up an excellent conference.
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