Buggy App is a simple java application that simulates different performance problems like Memory Leak, OutOfMemoryError, CPU spike, thread leak, StackOverflowError, deadlock, unresponsiveness, …
Continue reading “Buggy App – Simulate performance problems”What is GC Log, thread dump and Heapdump?
Java Virtual Machine (JVM) generates 3 critical artifacts that are useful for optimizing the performance and troubleshooting production problems. Those artifacts are:
Continue reading “What is GC Log, thread dump and Heapdump?”JAX Online 2020 – Why (& How to) write memory efficient code?
JAX – Online Edition 2020 is the conference for JAVA, architecture and software innovations. This conference had 4 major workshops and nearly 20 sessions presented by many speakers from all over the world! All were performed live, carried out with the video platform and designed interactively for the developers.
Continue reading “JAX Online 2020 – Why (& How to) write memory efficient code?”Surviving Covid19 – Effective way to cut-down IT spending!
Covid19 pandemic has already put a deep economic dent globally. US stock market has experienced the worst crash since 1987. Sooner or later, Enterprises have to figure out a plan to run their organizations on tight budgets. In this below 10 minute interview, our architect Ram Lakshmanan is sharing an effective way to cut down enterprise IT spending 20 – 30% without doing any lay-offs.
Continue reading “Surviving Covid19 – Effective way to cut-down IT spending!”7 JVM arguments of Highly Effective Applications
At the time (March 2020) of writing this article there are 600+ arguments that you can pass to JVM just around Garbage collection and memory. If you include other aspects, total JVM arguments count will easily cross 1000+. 😊. It’s way too many arguments for anyone to digest and comprehend. In this article, we are highlighting seven important JVM arguments that you may find it useful.
Continue reading “7 JVM arguments of Highly Effective Applications”Java – Missing font – Crashing App!
Eclipse MAT, Heaphero are all popular java tools to analyze large size heap dumps. Recently we ran in to an interesting problem when trying to analyze a heap dump file in Eclipse MAT. Tool was crashing because of missing font 😊. We thought we will share with you what we found out.
Continue reading “Java – Missing font – Crashing App!”MEMORY WASTED BY SPRING BOOT APPLICATION
One of the widely wasted resources in the world today is: Memory. Due to inefficient programming, surprising (sometimes ‘shocking’) amount of memory is wasted. We see this pattern repeated in several enterprise applications. To prove this case, we conducted a small study. We analyzed the famous spring boot pet clinic application to see how much memory it is wasting. This application has been designed by the community to show how the spring application framework can be used to build simple but powerful database-oriented applications.
Continue reading “MEMORY WASTED BY SPRING BOOT APPLICATION”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.
Continue reading “TCP: out of memory — consider tuning tcp_mem”All you need to know about System.gc()
In this article, we have attempted to answer the 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()”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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