monitor jvm memory

JVM Memory Structure I recently looked at some cases of Java Memory leakage and discussed it with several old buddies. I found that there are still many details that I didn't know before in the JVM. I will analyze them a little here. Let's take a look at the JVM internal str

Statement: This content is bloggers in the cattle online to see the answer published by netizens, because the feeling summed up is better, so excerpt come for everyone to learn.Content:Most JVMs divide the memory area into method area (non-heap), Heap (heap), program Counter Register (Application counter), VM stack (virtual machine stack, also translated into Java method stack), N Ative method Stack (local methods stack), where method area and Heap ar

), weak references (Weak Reference), virtual references (Phantom Reference) These 4 kinds of references are under the Java.lang.ref package:　　Strong references (Final Reference)Refers to references that are common in program code, such as Object obj = new Object (), as long as a strong reference exists, and the garbage collector never reclaims the referenced object.strong references have the following three features:1. A strong reference can directly access the target object;2. The object that t

Tomcat itself cannot run directly on the computer, and relies on a hardware-based operating system and a Java virtual machine. You can choose your own version of the operating system and the corresponding JDK (as long as it complies with the Sun-issued Java specification), but we recommend that you use the JDK published by Sun. Make sure that the version you are using is up to date because sun and other companies have been upgrading their Java virtual machines to improve performance. Some report

Creation of ObjectsA simple Creation object statement Clazz instance = new Clazz(); consists of a class load check, object allocation memory, concurrency processing, memory space initialization, object setting, execution ini method, and so on.The main processes are as follows:1. Class load CheckWhen the JVM encounters a new directive, it first checks to see if th

Jvm memory, I saw a summary from Niuke. I felt that it was well written. record it. Most JVMs divide the memory Area into Method Area (Non-Heap), Heap, Program Counter Register, and VM Stack (Virtual Machine Stack, also translated into JAVA Method Stack), Native Method Stack (local Method Stack), where Method Area and Heap are shared by threads, VM Stack, n

　　Most JVMs divide the memory area into method Area (non-heap) , Heap(heap) , program Counter Register (procedure counter) , VMStack (virtual machine stack, also translated into Java method stack), Native method Stack(local stack). 　　Method area and Heap are thread-shared .　　VM stack,native Method Stack and program Counter Register are non-thread-shared .Why is it divided into thread sharing and non-thread sharing? Please continue looking down.First,

New Object ();Main reference: "In-depth understanding of Java Virtual Machine", without the consent of the author and the original book to prohibit reprint.Data regions in the JVMThe data in the JVM is divided into the following areas:which1. Program Counter:A program counter is a small amount of memory space that is the line number indicator of the bytecode that is executed by the current thread . In other