Each JVM implementation had a different set of default and choose default settings based on the environment it runs in. It’s always good to know the default. Let’s see how to get the default. Using -XX:+PrintCommandLineFlags bash-3.2$ java -XX:+PrintCommandLineFlags -XX:InitialHeapSize=67108864 -XX:MaxHeapSize=1073741824 -XX:+PrintCommandLineFlags -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:+UseParallelGC This is the output on my laptop. The JVM choose […]
JVM
[JVM] How to track native code compilation for Java methods
JVM JIT is an awesome piece of Software craftsmanship. JIT compiles Java byte code to native platform code. The natively compiled code is stored in CodeCache, which is outside Java Heap and PermGen space. Watching this process can help in tuning CodeCache size if needed. Add the following parameter to JVM to see when a […]
[JVM] How to see Assembly code for your Java Program
It’s nice to know Java, but knowing how JVM actually executes is like Wow ! 🙂 JVM’s support diagnostic options that allows you to dump the actual Assembly that is generated by JVM for the specific runtime. Let’s quickly see how to enable this. To enable dumping Assembly, use following JVM options while running your […]