monitor jvm memory

The reason is that during the test of the new version of our cluster application (three machines), the general JVM memory usage is about 1 GB, but after a period of running, it slowly increases to 4 GB, this is obviously abnormal. Positioning process: 1. first, follow the steps on the machine to try to reproduce the scene. When a problem occurs, open JDK's jvisualvm on a machine to observe the

Jinfo: You can output and modify the opts of the Java process at runtime.JPS: Similar to PS on UNIX, used to show the local Java process, you can view the local running a few Java programs, and display their process number.Jstat: A very strong monitoring VM memory tool. can be used to monitor the size of various heap and non-heap sizes and their memory usage with

Jinfo: You can output and modify the opts of the Java process at runtime.JPS: Similar to PS on UNIX, used to show the local Java process, you can view the local running a few Java programs, and display their process number.Jstat: A very strong monitoring VM memory tool. can be used to monitor the size of various heap and non-heap sizes and their memory usage with

JVM memory region division Anyone who has learned the C language knows that the C compiler often divides the management area into data segments and code segments when dividing the memory area. The data segments include the heap, stack, and static data areas. In Java, how is the memory divided? Since Java programs are e

http://backend.blog.163.com/blog/static/20229412620128233285220/Memory management and garbage collection are two of the core components of the JVM, and mastering its internal implementation is a prerequisite for Java developers to develop high-quality Java systems. Recently compiled some knowledge about JVM memory mana

Deep understanding of the memory management mechanism of JVM Notes Runtime data Region program counter JVM stack local method stack Java heap method area run frequent pool Direct Memory object access OutOfMemoryError exception Java heap overflow sample JVM stack and local me

Label: JVM Memory Model1. Specific JVM Program Execution Process Since Java programs are executed by JVM, when we talk about Java memory partition, it actually refers to JVM memory part

The configuration of my server:# OS specific support. $var _must_ is set to either true or false.Java_opts= "-xms1024m-xmx4096m-xss1024k-xx:permsize=512m-xx:maxpermsize=2048m"Body:Common memory overflows are listed in the following two ways:Java.lang.OutOfMemoryError:PermGen SpaceJava.lang.OutOfMemoryError:Java Heap Space---------------------------------------------------------Here, for example, the Tomcat environment, other Web servers, such as Jboss

The Java heap is described as follows: Heap = {old + new = {Eden, from, }} Memory is composed of perm and heap. Heap = {old + new = {Eden, from, }}JVM The memory model has two major blocks: New generation, The other is Old Generation. In New Generation Is called Eden Space, mainly used to store new objects, there are two more Specified vor spaces (from,

C-language friends know that the C compiler often divides the area of memory into data segments and code snippets, and data segments include heaps, stacks, and static data areas. So in the Java language, how is memory divided?Since Java programs are executed by the JVM, we are talking about the partitioning of the Java memory