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GC easy – Universal Java GC Log Analyser

GC allocation stall

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TCP: out of memory — consider tuning tcp_mem

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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CloudBees GC performance optimized with GCeasy

Cloudbees, who is the industry leader behind Jenkins CI/CD pipeline has optimized their garbage collection performance using GCeasy.

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TD Bank using GCeasy

TD Bank (one of the largest bank in Canada) use our products: GCeasy, FastThread and HeapHero.

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All you need to know about System.gc()

In this article, we have attempted to answer most common questions around System.gc() API call. We hope it may be of help.

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LARGE OR SMALL MEMORY SIZE FOR MY APP?

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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OUTOFMEMORYERROR RELATED JVM ARGUMENTS

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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AUTOMATING – OUTOFMEMORYERROR TROUBLESHOOTING

Troubleshooting OutOfMemoryError or any memory related problem is done 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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DOES 32-BIT OR 64-BIT JVM MATTER ANYMORE?

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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