JVM monitoring and diagnostic tools - command line

Study Silicon Valley Song Hongkang JVM From entry to mastery Learning notes of

summary

Performance diagnosis is a problem that software engineers often face and solve in their daily work , In today's world of user experience , Solving the problem of application performance can bring great benefits .
Java As one of the most popular programming languages , Its application performance diagnosis has been widely concerned by the industry . May cause Java There are many factors that cause performance problems in applications , Such as thread control 、 Disk read and write 、 Database access 、 The Internet I/O、 Garbage collection, etc . Want to position these issues , An excellent performance diagnosis tool is essential .
Java The usage of is relatively large ,Java Mainly doing backstage , Our various terminals , For example, browser ,app wait , Will centrally access the background , There is a high concurrency scenario , In this highly concurrent scenario, we need to pay special attention to performance .

experience 1： Use data to illustrate , Using knowledge to analyze problems , Use tools to deal with problems .
experience 2： There is no monitoring 、 Non tuning ！（ Without monitoring, there is no way to fine tune .）

jdk Of bin Simple command line tools under the directory

jdk Of bin Catalog , There are a series of auxiliary tools , These aids are used to get the target jvm Different aspects 、 Different levels of information , Help developers solve Java Some of the problems with apps .

You can double-click to open

The source location of the file can be opened above

jar The file is generated after the bytecode file is packaged ,

Direct decompression tools.jar See the following path of the file , These are the execution above exe Bytecode

Source code address