List/Grid Tag Archives: JVM

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Java Thread: retained memory analysis

This article will provide you with a tutorial allowing you to determine how much and where Java heap space is retained from your active application Java threads. A true case study from an Oracle Weblogic 10.0 production environmen ...
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Weak, Weaker, Weakest, Harnessing The Garbage Collector With Specialist References

When and when not to use specialist references in Java Weak, Soft and Phantom references are dangerous and powerful. If they are used the wrong way they can destroy JVM performance; however, when used the correct way they can subs ...
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Under the JVM hood – Classloaders

Classloaders are a low level and often ignored aspect of the Java language among many developers. At ZeroTurnaround , our developers have had to live, breathe, eat, drink and almost get intimate with classloaders to produce the JR ...
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Should I use a 32- or a 64-bit JVM?

This is a question I have faced several times during my career in enterprise software development. Every once in awhile I’ve had to hand out recommendations for configuring a specific new environment. And more often than not, pa ...
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Escaping the JVM heap for memory intensive applications

If you’ve ever allocated large Java heaps, you know that at some point – typically starting at around 4 GiB – you will start having issues with your garbage collection pauses. I won’t go into detail about ...
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Why can’t I turn off the Garbage Collector?

Let’s start with a quick rewind to the early days of my career as a Java developer. I wanted to eliminate Garbage Collection (GC) pauses from a test that I was conducting. Lo and behold I was annoyed when I discovered that it co ...
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Should you trust the default settings in JVM?

JVMs are considered smart nowadays. Not much configuration is expected – just set the maximum heap to use in the startup scripts and you should be good to go. All other default settings are just fine. Or so some of us mistakenly ...
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Yammer Metrics, A new way to monitor your application

When you are running long term applications like web applications, it is good to know some statistics about them, like number of requests served, request durations, or the number active requests. But also some more generic informa ...
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Increasing heap size – beware of the Cobra Effect

The term ‘Cobra effect’ stems from an anecdote set at the time of British rule of colonial India. The British government was concerned about the number of venomous cobra snakes. The Government therefore offered a reward for ev ...
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Do you get Just-in-time compilation?

Remember the last time when you were laughed at by C-developers? That the Java is so slooooow that they would never even consider using a language like this? In many ways, the concept still holds. But for it’s typical usage – ...
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