jvm monitor

Brief introduction Starting with IBM I 7.1, IBM Classic Java Virtual Machine is no longer supported by IBM I. The IBM Technology for Java Virtual Machine (also known as the IBM J9 JVM) became the only supported JVM. This article is intended to illustrate the differences between the two JVMs, while helping users and developers migrate their applications from the Classic

I. Introduction of TOOLSJconsole: A Java GUI monitoring tool that can display a variety of data in a tabular format. Remote server VMS can be monitored through remote connections. A GUI program written in Java, used to monitor VMS, and to monitor remote VMS, is very easy to use and very powerful. Command line to play Jconsole, select the process is OK.It is important to note that before running the Jconsole

JVM Memory Model and jvm Model JVM defines the data regions used during execution of several programs. Some data in this region is created at JVM startup and destroyed at JVM exit. Other data depends on every thread. It is created when the thread is created and destroyed w

JVM Insider: detailed explanation of Java virtual machine, jvm Insider: Java Virtual Machine This article explains the internal architecture of Java Virtual Machine (JVM. Displays typical JVM core internal components that comply with Java SE 7 specifications. The displayed components are explained in two chapters. The

JVM Insider: detailed explanation of Java virtual machine, jvm Insider: Java Virtual Machine This article explains the internal architecture of Java Virtual Machine (JVM. Displays typical JVM core internal components that comply with Java SE 7 specifications. The displayed components are explained in two chapters. Th

This article says how to understand threads from a JVM's point of view, you can have a deeper understanding of the Java threading model, and some of the details of the GC will be more deeply understood. This paper is based on the OpenJDK7 implementation of hotspot.We know that the JVM is primarily implemented in C + +, and the class inheritance structure for the thread defined by the JVM is as follows:Class

JVM全称是java Virtual Machine(java虚拟机)，JVM屏蔽了与各个计算机平台相关的软件和硬件差异在接下来的日子里，我要通过写博客的形式学习JVM，让自己更懂得Java本系列文章是对《深入分析javaweb技术内幕》和《深入理解java虚拟机》的总结，欢迎大家一起吐槽，一起进步This article is the first in the JVM interpretation:JVM ArchitectureJVM ArchitectureBasic composition of the JVM(1) instructi

JVM garbage collection mechanism and jvm garbage collection Scope: areas to be recycled Among the five JVM memory models, three do not require garbage collection: Program counters, JVM stacks, and local method stacks. Because their lifecycle is synchronized with the thread, the memory they occupy will be automatica

How JVM works, how jvm works I. JVM Lifecycle The life cycle of a Java VM is a clear task for executing Java programs. It runs only when the program starts to run, and stops when the program ends. When you run three programs on the same machine, there will be three running Java virtual machines. The Java Virtual Machine always starts with a main () method. This m

Whether it is YGC or full gc,gc in the process of causing the program to break, the correct choice of different GC policies, tuning the JVM, GC parameters, can greatly reduce the problem caused by the work of the GC, resulting in the operation of the program to improve the efficiency of the Java program. However, the tuning of GC is a very complex process, due to different features of the program, such as: Web and GUI programs have a very big differen

JVM architecture and jvm Architecture JVM is an abstract computer. Based on the stack architecture, it has its own instruction set and memory management. It is the basis for Java cross-platform implementation. JVM interprets and executes bytecode, or compile the bytecode for code execution. The Java virtual machine arc

Eclipse modifies jvm parameter optimization methods (2 types) and jvm Optimization This article describes how to modify jvm parameter optimization methods in eclipse (two methods). The details are as follows: When you do not configure eclipse, you will always feel slow to start and use eclipse. In fact, you only need to configure eclipse-related parameters, there

Chapter 7 JVM performance monitoring and troubleshooting tools (1), jvm troubleshooting 1. Locate System Problems Basis GC log Heapdump/hprof File) Thread snapshot (threaddump/javacore file) Running log Exception Stack Tools used for analysis Jps: displays all JVM processes in a specified system. Jstat: Collects

Today, I just received an insite letter from csdn, explaining the reason why my previous article was removed from the blog homepage. In fact, I did not care much about the withdrawal of the article, however, I was a little frustrated when I was removed three or four times in a row, so I didn't post any more articles in those days, and I couldn't open the homepage of my blog after I debugged the network environment of my school. I finally got better recently. Suddenly I want to say that I have co

JVM exploration-Memory Management (1), jvm exploration Memory Management The first article in this series is expected to have two or three cases at the end of this series. Java is different from C and C ++. Java does not need Coder for manual memory management, and all of this is handed over to JVM for automatic memory management, to some extent, this reduces th

This is a creation in Article, where the information may have evolved or changed. Although written for many years of Java code, but basically only the JVM when blackbox processing. The book on the JVM has also seen several books, but the results are poor. See OPENJDK code? Not interested. I've had a few weeks of free time, so I decided to write a JVM in the Go la

Deep understanding of JVM structure and jvmJVM structure ---- 1. JVM Structure 2. JVM runtime data Zone 1) Program Counter (Program Counter Register) The program counter is used to store the JVM commands that each thread will execute next. If this method is native, the program counter does not store any information. 2)

Jvm runtime memory parsing and jvm runtime memory Parsing I. jvm Concept 　　Before learning about the concept of jvm, let's first understand the logic structure of the java platform. The picture is from deep java virtual machine. 　　 We can see that jdk contains jre, java language and java development tools and APIs. jr

JVM exploration-Memory Management (2), jvm exploration Memory Management In the previous article, we introduced the memory structure managed by JVM, that is, the Run-Time Data Areas. Now we will introduce JVM memory allocation and recovery.Static Memory Allocation and dynamic memory allocation

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 the heap in JVM is called non-heap memory )". JVM manages two types of memory: heap and n