Many programmers think that the performance tuning of JVM and Mysql is not a big deal. They usually write code well, and they don’t know much about JVM. They think it’s tens of millions or even hundreds of millions of large traffic and large projects. Only use it, other general scenes are not used at all, until I meet such a scene——
Have you ever experienced such a scene
The online system CPU, IO, and memory are suddenly full, and the interface response time is too long
The online system is suddenly stuck and cannot be accessed, and GC alarms are frequently received
Sudden OOM memory overflow in online system, memory leak cannot be located
The online production environment does not know how to set various parameters of the JVM
Slow execution of online system SQL causes system interface timeout
Online database Mysql concurrency is too high causing deadlock
Online database Mysql jitters inexplicably and cannot be located
If you can't answer, you have to pay more attention! Regardless of the size of the project, if you want to understand Java code tuning, you must combine methods with production. Reasonable optimization can greatly improve work efficiency. The following are the problems that many developers often encounter:
- I have read tuning related knowledge points on the Internet, but I haven't done it, so forget it after reading it;
- Redis, Kafka, etc. are called directly at work, and they are at a loss when a problem occurs;
- Because tuning is just tuning a parameter, the focus is to optimize the code;
- The interviewer asked about the tuning experience, but it turned out that there was no actual operation at all;
- When encountering high-concurrency production problems, add machines and configurations, but there is no good solution.
If these problems are not resolved, there will be a high probability of repeated CRUD, staying up late and working overtime every day. If you don't want to be an obscure CRUDer all the time, if you want to have a role in the team, or your desire is simple-you want more money and less work to be close to home, then it is recommended that you must nibble on performance tuning.
Listen, you can gain:
1. Thoroughly master the bottom-level principles of JVM, and deal with interviews with large companies calmly
2. Ability to analyze, locate and solve JVM problems in the production environment of large systems
3. Thoroughly master the underlying optimization principles of Mysql and sweep all the interview questions about Mysql optimization
4. Ability to analyze and optimize various performance problems of Mysql in the online environment of large systems
5. Have the ability to build a large-scale distributed system with stable performance and high concurrency and high availability online environment
What do you need to learn and prepare for jvm?
mind Mapping
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Learning document
There is no unnecessary nonsense in the full text. One knowledge point corresponds to an explanation. When you need to learn JVM related knowledge points, this will be a good reference, and, if you want to learn tuning, you still need to start from the underlying principles, only understand The lower level things can be better tuned, right? Although you may not be able to use it later, but in the interview, if you want to go to some better company, these are the content that you must ask, how do you choose?
—, JVM memory area division
Two, JVM execution subsystem
Three. Garbage collector and memory allocation strategy
Fourth, write efficient and elegant Java programs
Five, performance optimization
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Interview
If you have an interview demand in a short period of time, and the interview is not ready yet, that’s okay, just grind your gun, and you’re not happy
Interview questions
Under the interview questions
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video
Of course, how can it be only with documents? In my opinion, reading documents is too wasteful of time. Come on, here is the video, the interview questions with joint manufacturers, explaining JVM and multi-threading, don’t hurry up and collect it.
Recently, my article focuses on sharing learning interview materials, because my public account: Java Architects Alliance background friends leave me with interview questions about whether there is such a knowledge point, and I have to prepare for the interview. It’s not the right way, so in addition to sharing interview materials, there are also corresponding learning materials
Friends who only need interview questions, come here directly: My code cloud address , and the corresponding information has been uploaded to my code cloud