Programmer Group

This article is compiled and published by jiumo (Ma Zhi), chief lecturer of HeapDump performance communityPart 29 - calling the main() method of the Java main classMany articles have been written to introduce the assembly code execution logic corresponding to bytecode instructions, and some assembly code logic corresponding to bytecode instruct ...

1, Mental process In Java Concurrent Programming, the synchronized keyword is undoubtedly a frequently asked question. During the interview, many interviewers pay more attention to your understanding of the synchronized keyword and its underlying. If you can answer it, it will undoubtedly add points. The following is what I learned through mys ...

1. Preliminary cognition of class and object [object oriented concept]: 1. Object oriented is a way of thinking and an idea. For example: concepts and examples. Theory and practice. Name and reality, etc 2. Class is the general name of a class of objects. An object is an instance of this kind of materialization. 3. The benefits of obj ...

1, jps (Java Process status) view the running java process Start the following procedure: Parameters: -q: Show ID ONLY -l fully qualified name of the output program -m output the parameters passed to main when the process starts -v list JVM parameters View process details by jps Name: 1,jps  2,jps -q  3,jps -l  4,jps -m    ...

Introduction to JMH JMH is a tool set dedicated to code micro benchmarking. JMH is developed by the team implementing Java virtual machine. Since the JVM has become more and more intelligent, it may be optimized to varying degrees in the compilation stage, class loading stage and running stage of java files, so the code written by developers ...

1. Performance optimization case 1: adjusting heap size to improve service throughput 1.1. Modify tomcat JVM configuration In the production environment, Tomcat does not recommend configuring variables directly in catalina.sh, but in setenv.sh under the same level directory (bin directory) as Catalina. 1.2 initial configuration Writ ...

This article is compiled and published by jiumo (Ma Zhi), chief lecturer of HeapDump performance community Chapter 17 - x86-64 register The system of machine language that can be interpreted by different CPUs is called ISA (Instruction Set Architecture), or instruction set. Intel calls the 32-bit CPU Instruction Set Architecture among x86 seri ...

reference material: Silicon Valley JVM tutorial 22.JVM runtime parameters 22.1. JVM parameter options Official website address: https://docs.oracle.com/javase/8/docs/technotes/tools/windows/java.html 22.1.1. Type I: standard parameter option Server mode and Client mode The Hotspot JVM has two modes, server and client, which are set through th ...

1. Java's own tools and methods 1.1 the list set is spliced into comma separated strings 1.2 compare whether two strings are equal, ignoring case 1.3 compare whether two objects are equal 1.4 intersection of two List sets 2. apache commons tool class library 2.1 commons Lang, enhanced version of java.lang 2.2 common collections co ...

1. Function Isolated load class In some frameworks, middleware is isolated from application modules, and classes are loaded into different environments. Modify how classes are loaded The loading model of class is not mandatory. It should be loaded dynamically at a certain point in time according to the actual situation. Extended load so ...