Home » Tag Archives: JVM

Tag Archives: JVM

Dismantling invokedynamic

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Many Java developers regarded the JDK’s version seven release as somewhat a disappointment. On the surface, merely a few language and library extensions made it into the release, namely Project Coin and NIO2. But under the covers, the seventh version of the platform shipped the single biggest extension to the JVM’s type system ever introduced after its initial release. Adding ...

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ChronicleMap – Java Architecture with Off Heap Memory

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My last post was written a couple of weeks ago and after some valid feedback I’d like to clarify a couple of points as a preface to this article. The main takeaway from ‘Creating millions of objects with Zero Garbage‘ should be that with Chronicle you are not ‘limited’ to using jvm allocated on-heap memory when writing a Java program. Maybe ...

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Using jstat to report custom JVM metric sets

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I’ve always been missing possibility to configure custom headers in JStat. Of course there are a lot of predefined data sets, but it’ll be nicer if we could create our own data set. And as you probably already devised I’m writing this post because such functionality is of course available :) Unfortunately I haven’t found it in any documentation so ...

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Minor GC vs Major GC vs Full GC

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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, I was repeatedly confused about the (mis)use of the Minor, Major and Full GC events. This led to this blog post where I hope I manage to clear some of ...

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JVM Pressure – Context Switching Overhead

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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 to create an illusion of continuous progress. However, the suspension of the first process and scheduling of the second one requires the kernel to store the state of the first process and load the state ...

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Byteman – a swiss army knife for byte code manipulation

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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 reason why I am very thankful to have the opportunity to welcome guest bloggers here from time to time. Today it is Jochen Mader, who  is ...

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How JVMTI tagging can affect GC pauses

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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 how JVMTI tagging is handled during GC pauses. Spotting a problem One of our customers complained about the application being significantly less responsive with the Plumbr Agent attached. Upon analyzing the GC logs, we found an ...

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