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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.
Continue reading “TCP: out of memory — consider tuning tcp_mem”
Cloudbees, who is the industry leader behind Jenkins CI/CD pipeline has optimized their garbage collection performance using GCeasy.
Continue reading “CloudBees GC performance optimized with GCeasy”
TD Bank (one of the largest bank in Canada) use our products: GCeasy, FastThread and HeapHero.
Continue reading “TD Bank using GCeasy”
In this article, we have attempted to answer most common questions around System.gc() API call. We hope it may be of help. Continue reading “All you need to know about System.gc()”
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.
Continue reading “LARGE OR SMALL MEMORY SIZE FOR MY APP?”
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:
Continue reading “OUTOFMEMORYERROR RELATED JVM ARGUMENTS”
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:
Continue reading “AUTOMATING – OUTOFMEMORYERROR TROUBLESHOOTING”
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.
Continue reading “DOES 32-BIT OR 64-BIT JVM MATTER ANYMORE?”