List/Grid Tag Archives: JVM

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Minor GC vs Major GC vs Full GC

While working with the GC pause detection functionality in Plumbr I was forced to work my way through loads of articles, books and presentations about the subject. Throughout the journey, ...
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JVM Pressure – Context Switching Overhead

Context Switching (CS) is a valuable service provided by the underlying Operating System. It prevents greedy processes from CPU hogging, time-shares CPU between multiple threads/tasks/processes ...
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Why is my JVM having access to less memory than specified via -Xmx?

“Hey, can you drop by and take a look at something weird”. This is how I started to look into a support case leading me towards this blog post. The particular problem at hand was ...
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Byteman – a swiss army knife for byte code manipulation

I am working with a bunch of communities in JBoss and there is so much interesting stuff to talk about, that I can’t wrap my head around every little bit myself. This is the main ...
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How JVMTI tagging can affect GC pauses

This post is analyzing why and how Plumbr Agents extended the length of GC pauses on certain occasions. Troubleshooting the underlying problem revealed interesting insights about ...
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Java Flight Recorder (JFR)

JFR is a Java profiler which will allow you to investigate the runtime characteristics of your code. Typically you will use a profiler to determine which parts of your code are causing ...
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JVM is down with “OutOfMemory” error – what should I do?

Amazing as it may seem, but this particular cry “From the Depths” is frequently displayed among the results of search requests regarding JVM settings. You have probably been faced ...
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Starting multiple JBoss A-MQ JVMs on the same machine

So I haven’t been blogging as much recently — just been really busy. But my New Year’s resolution is to blog a little more sharing some things I come across frequently, even if ...
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How is Java / JVM built ? Adopt OpenJDK is your answer!

Introduction & history As some of you may already know, starting with Java 7, OpenJDK is the Reference Implementation (RI) to Java. The below timeline gives you an idea about the ...
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Testing JVM server-side JavaScript with Jasmine, Spock and Nashorn

JavaScript usage is not limited to client-side code in browser or NodeJS powered server-side code. Many JVM based projects are using it as internal scripting language. Testing this ...
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