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Tag Archives: JVM

Simplicity and Value of HotSpot’s -XshowSettings Flag

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A handy HotSpot JVM flag (option for the Java launcher java) is the -XshowSettings option. This option is described in the Oracle Java launcher description page as follows:                 -XshowSettings:category Shows settings and continues. Possible category arguments for this option include the following: all Shows all categories of settings. This is the default ...

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Improved Documentation of HotSpot Options in Java 8

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One of the small but welcome features introduced with Oracle’s HotSpot implementation of Java 8 is the addition of many common HotSpot Java launcher (java) options/flags to the launcher’s documentation. In the past, a developer interested in even some fairly common HotSpot JVM options has had to potentially look in multiple different sources to find “official” documentation on these flags. ...

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Introducing Cucumber for Java + STANDARD Values

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As software developers, we all have our favorite tools for making us successful. Many are perfect for the job when getting started but are soon outgrown. Others require too much setup and training to “dip your toes in the water” just to simply find out if they are the right tool. Cucumber JVM is a testing framework that enhances JUnit ...

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5 Tips for Reducing Your Java Garbage Collection Overhead

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What are some of the most useful tips for keeping your GC overhead low? With the upcoming-yet-delayed-once-again release of Java 9, the G1 (“Garbage First”) garbage collector is set to become the default collector of the HotSpot JVM. From the serial garbage collector all the way to the CMS collector, the JVM has seen many GC implementations throughout its lifetime, ...

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JIT Compiler, Inlining and Escape Analysis

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Just-in-time (JIT) Just-in-time (JIT) compiler is the brain of the Java Virtual Machine. Nothing in the JVM affects performance more than the JIT compiler. For a moment let’s step back and see examples of compiled and non compiled languages. Languages like Go, C and C++ are called compiled languages because their programs are distributed as binary (compiled) code, which is ...

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