List/Grid Tag Archives: JVM

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Add Some Entropy to Your JVM

Being able to generate true random numbers depends on the entropy in your system. Some claim, that this can be guaranteed by fair dice roll. Others think that replacing the OpenJDK’s ...
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How To Write Your Own Java / Scala Debugger

With this post we’ll explore how Java / Scala debuggers are written and work. Native debuggers such WinDbg for Windows or gdb for Linux/Unix get their power from hooks provided to ...
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Java Mission Control 5.2 is Finally Here! Welcome 7u40!

It has been a while since we last heard of this fancy little thing called Mission Control. It came all the way from JRockit and was renamed to Java Mission Control. This is one of the ...
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Dealing With Slow Resource Leaks

Finding resource leaks using Java-monitor Finding slow resource leaks is key to keeping your application servers up and running for very long times. Here I explain how I use Java-monitor ...
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Understanding the OutOfMemoryError

Whenever you find yourself staring a stacktrace with OutOfMemoryError in it, it should all be crystal clear. The program has got no more elbow room and is dying just because of lack ...
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5 Coding Hacks to Reduce GC Overhead

In this post we’ll look at five ways in which we can use efficient coding to help our garbage collector spend less CPU time allocating and freeing memory, and reduce GC overhead. ...
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Java Garbage Collection Distilled

Serial, Parallel, Concurrent, CMS, G1, Young Gen, New Gen, Old Gen, Perm Gen, Eden, Tenured, Survivor Spaces, Safepoints, and the hundreds of JVM startup flags. Does this all baffle ...
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Java Just-In-Time compilation: more than just a buzzword

A recent Java production performance problem forced me to revisit and truly appreciate the Java VM Just-In-Time (JIT) compiler. Most Java developers and support individuals have heard ...
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Garbage Collection in Java (4)

G1: Garbage First The G1 collector is the latest collector to be implemented in the hotspot JVM. Its been a supported collector ever since Java 7 Update 4. Its also been publicly stated ...
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Micro jitter, busy waiting and binding CPUs

Performance profiling a new machine When I work on a new machine, I like to get an understanding of it’s limitations.  In this post I am looking at the jitter on the machine ...
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