The size of Metaspace is controlled by setting -XX:MetaspaceSize.Īdditional JVM overhead - In addition to the above, some memory is consumed by the JVM itself. Metaspace - Metaspace stores the class definitions of your objects. The -Xss JVM option controls how much memory gets allocated for each thread’s stack. The stack is cleaned up as stack frames move out of context, so no GC is performed here. The stack stores primitive local variables and object references, along with the call stack (method invocations) itself. Java Stack - Each thread has its own call stack. Heap size is controlled by the -Xms and -Xmx JVM flags. When discussing Java memory and optimization, we most often discuss the heap because we have the most control over it, and it is where garbage collection (and GC optimizations) take place. Instance variables are stored in objects. Java Heap - The heap is where your class instantiations (or objects) are stored. Outside of the heap, memory is also consumed by Metaspace and the stack. The primary, but not singular, use of memory is in the heap. The JVM uses memory in a number of different ways. Tuning the memory use of your application requires understanding both how Java uses memory and how you can gain visibility into your application’s memory use. Profiling memory use of a Java application.
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