monitor jvm memory

Click to enter _ more _java thousand ask1, how to monitor the operation of the JVMUnderstanding the JVM memory model look here: What is the Java memory modelUnderstanding JVM Memory Management Look here: How the

classloader,compiler,gc of the process;② monitors the size of various heap and non-heap sizes in VM memory, their memory usage, and the number of load classes.Jmap (Java Memory Map)Monitor the consumption of the JVM's physical memory in the process running, the process in

Detailed description of JVM memory partition and garbage collection mechanism, jvm garbage collection When writing Java code, you do not need to worry about whether your New object is released or when. Because the JVM has an automatic garbage collection mechanism. In our previous blog, we talked about the MRC (manual r

The JVM defines the range of data that is used during the execution of several programs. Some of the data in this area is created when the JVM is started and destroyed when the JVM exits. The rest of the data is dependent on each thread, created when the thread is created, and destroyed when the thread exits. Program Counter A program counter is a small

Chapter 2 JVM memory allocation and Chapter 2 jvm allocation Note: This blog is mainly based on the following three books: Distributed Java applications: basics and practices Deep understanding of Java Virtual Machine (version 2) 16 lessons that break the basic skills of programmers Note: For details about the JVM

Java memory composition:Heap and non-heap memory According to the official statement: "A Java virtual machine has a heap. The heap is the runtime data area, and the memory of all class instances and arrays is allocated from this place. The heap is created when the Java Virtual Machine is started ." "Memory outside of

Memory, as an important resource in the system, plays a key role in the stable operation and efficient operation of the system, unlike languages like Java and C, which do not require the developer to allocate memory and reclaim memory, but rather the JVM manages the allocation of object

Learn JVM easily (II)-memory model, visibility, Command Re-sorting, jvm Model In the previous article, we introduced the basic running process and memory structure of JVM, and had a preliminary understanding of JVM, in this articl

Deep understanding of Java Virtual Machine: JVM advanced features and best practices (in-depth analysis of JVM Based on issues such as memory management and high concurrency) Provides a comprehensive and in-depth analysis of JVM based on core content such as memory managemen

System CentOS6.4 Yum installed Tomcat6 and jdk1.6, the installation configuration process is as follows: Http://www.111cn.net/sys/CentOS/72007.htm The deployment of two projects A and B in Tomcat, as well as the time of memory overflow error in the deployment times, the system CPU load is soaring, and a, B, and only multiple a, or just multiple B-project systems are deployed separately for normal operation. View Log error: Outofmemoryerror:permgen

A deep understanding of one jvm [memory region] and a deep understanding of the jvm Region Before the beginning of this article, we need to declare that this series of articles discuss the hot spot VM. Most of the ideas in this article are based on Zhou Zhiming, who deeply understands the Java VM: JVM advanced features

JVM Memory Model The memory space of the Java Virtual machine (Java MACHINE=JVM) is divided into five parts, respectively:1. Program counter2. Java Virtual machine stack3. Local Method Stack4. Heap5. Method area. The following is an in-depth introduction to these five regions.1. Program Counter 1.1. What is a program c

: Get more detailed information about the heap.U-xloggc:[file]: Output GC information to a separate fileJstat: Virtual Machine Statistics monitoring toolReal-time monitoring of the virtual runtime of the class load, the various parts of the memory consumption, GC situation, JIT compilation and so on.Example: Every 250ms query process 2211 garbage collection situation, query 50 timesStep ①:JPS List all running JVM