List/Grid Tag Archives: JVM

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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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Printing Generated Assembly Code From The Hotspot JIT Compiler

Sometimes when profiling a Java application it is necessary to understand the assembly code generated by the Hotspot JIT compiler. This can be useful in determining what optimisation ...
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Garbage Collection in Java (3)

This follows on from my previous two garbage collection blog posts:Overview of GC in Hotspot. Parallel Garbage Collectors.Concurrent Mark Sweep The parallel garbage collectors in ...
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Garbage Collection in Java (2)

Parallel Scavenge Today we cover how Parallel GC works. Specifically this is the combination of running a Parallel Scavenge collector over Eden and the Parallel Mark and Sweep collector ...
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Garbage Collection in Java (1)

This is the first in a series of posts about Garbage Collection (GC). I hope to be able to cover a bit of theory and all the major collectors in the hotspot virtual machine over the ...
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Why does my Java process consume more memory than Xmx?

Some of you have been there. You have added -Xmx option to your startup scripts and sat back relaxed knowing that there is no way your Java process is going to eat up more memory than ...
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GC Memory Visualizer Tutorial – Part1

As you may have read from past articles, one of the key Java programmer skills to acquire is your ability to understand and assess the health of the JVM such as the Java heap memory ...
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Reducing memory consumption by 20x

This is going to be another story sharing our recent experience with memory-related problems. The case is extracted from a recent customer support case, where we faced a badly behaving ...
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