jvm memory management

Optimize JVM memory to solve outofmemoryerror From the VM specification, we can see several exceptions.Java. Lang. stackoverflowerror :( very few)Java. Lang. outofmemoryerror: heap space (common)Java. Lang. outofmemoryerror: permgen space (frequently seen) The following are the most common examples: Java. Lang. outofmemoryerror Permgen space is a common exception. It refers to the exception

I. Diagram of the Java Technical System Module Ii. JVM memory Zone Model 1. Method Area It is also called "permanent generation" and "non-heap". It is used to store class information, constants, static variables, and memory areas shared by various threads. The default value is 16 MB and the maximum value is 64 MB. You can use the-XX: permsize and-XX

What is 1.JVM?　　Jvm:java virtual mechinal (Java vm). It is a fictional computer that is implemented by simulating various functions on a real computer. The main task of the JVM is to interpret its own set of instructions (bytecode, such as Java source code compiled into a class file to run on a virtual machine) and map to a local CPU instruction set or system call to the OS. The essence of the cross-platfor

The phenomenon of suspended animation in Java services (such as the Web page cannot open, open a blank page, the speed of access to a dramatic decline), you need to engineer in the first time dump JVM memory data, to analyze the reason. So how do I get the JVM memory dump file?Execute under the CMD console or Linux ter

A brief introduction to the jvm runtime data zone #160; #160; #160; the memory managed by JVM is divided into the following runtime data zones: program counters, Java virtual machine stacks, local method stacks, Java stacks, and method zones. #160; #160; This article mainly involves: java virtual machine station (java stack), java heap, and method zone. #16

Summary after reading Java Virtual Machine 1) Sun HotSpot JVM Memory Model 2) Sun HotSpot JVM Memory Allocation Iii) Sun HotSpot JVM memory monitoring 4) Sun HotSpot JVM garbage collect

Recently I have been familiar with a project that has been developed for several years. I need to port the database from MySQL to Oracle. First, I need to point the JDBC connection to MySQL and package it into tomcat to run it. There is no problem, however, when the JDBC connection is directed to Oracle, Tomcat continuously throws Java. lang. outofmemoryerror: I googled the Internet and learned about the running mechanism of Tomcat. I also solved the problem and shared it for future reference. 1

1.JVM run-time data region partitioningA. Procedure counter (program Counter Register)A small piece of memory space, which can be seen as the line number indicator of the byte code executed by the current thread. Each thread has a separate counter, and if the native method is currently executing, the counter value is empty. B.JVM Stack (Java Virtual machine Stack)Describes the

800x600 Normal 0 7.8 lb 0 2 false false en-US ZH-CN x-none Eclipse set JVM memory in Today, in Eclipse, when you test a document into a picture, the following error is reported: Java.lang.OutOfMemoryError:Java Heap Space As you can see from the above exception information, the JVM needs to use more memor