Preface
Regarding performance tuning, let me first talk about my feelings. Java performance tuning is not like learning a programming language, which cannot be mastered and applied through straight-line thinking. It has high requirements for the breadth and depth of the engineer’s technology. The requirements of senior engineers from the next-tier manufacturers are a must Performance tuning is required.
In the Internet age, a simple system includes applications, databases, containers, operating systems, networks and other technologies. Once performance problems occur online, you may need to coordinate multiple components to optimize. This is the breadth of technology; and many The performance problem is hidden deep, maybe because of a small code, or because of the wrong type of thread pool... But in the final analysis, the test is the level of our understanding of this technology, which is the depth of technology.
Obviously, performance tuning is not an easy task. But is there any way to do this well? Are there any good reference materials on the market for us to learn from? Some time ago, a friend of mine who has worked in Meituan for many years privately passed me two advanced notes on performance optimization that they are using internally. The notes start from actual combat and select high-frequency performance issues, and extract them through the underlying Java source code. The optimization ideas and the implementation principles behind it finally form a set of "tuning methodology that can be used after learning . " It is the best choice for our programmers to advance, the gap is more than a little! Due to space limitations, only the main content can be displayed in the form of screenshots. Friends who need the full HD version of the PDF I put the method of obtaining it at the end of the article! !
In my opinion, three things you need to have to optimize Java performance (personal opinion, don’t spray)
1. A solid computer foundation
2. Used to understand the nature of technology through source code
3. Good at questioning and summarizing
Not much to say, first come to the actual combat and then the concept
Performance tuning in action
Overview
Establish two standards for you. One is the performance tuning standard, which tells you which parameters can be used to measure system performance; the other is the tuning process standard, which shows you the strict tuning strategies that we can use to troubleshoot performance problems and solve the problems.
Java programming performance tuning
JDK is the basic library of the Java language. Familiar with the tool classes in each package in the JDK can help you write high-performance code. Here I will start from the basic data types, involving the tuning of containers in actual application scenarios, as well as the more important network communication tuning in the current Internet system architecture.
Multi-threaded performance tuning
At present, most servers are multi-core processors, and multi-threaded programming is widely used. In order to ensure the safety of threads, synchronization locks are usually used, which will bury many hidden dangers for the system; in addition, there are performance problems caused by high concurrency of multithreading, which will be explained in this module.
JVM performance monitoring and tuning
Java applications run on the JVM. Tuning the JVM can improve system performance. Here focuses on the creation and recycling of Java objects, memory allocation, etc. Design pattern tuning In architecture design, we often use some design patterns to optimize the architecture design. It will also share design optimization cases in combination with some complex application scenarios.
Database performance tuning
The database is most likely to become the performance bottleneck of the entire system. Here we focus on analyzing some commonly used tuning methods for databases.
Practice field
The content of the above six modules are all based on tuning at a certain point. Now is the time to mobilize what you have learned before. This module will take you into application scenarios where comprehensive performance problems occur frequently and learn about overall tuning. method.
- How to design a better distributed lock?
- Distributed transaction tuning of e-commerce system
- How to use cache to optimize system performance?
- Remember the performance bottleneck tuning of Double Eleven
Concept
Overview of Java performance tuning
Introduced the basic concepts of performance, two important laws (the barrel principle and Amdaihl's law), and the general process and precautions of system tuning.
Design Optimization
From the design level, introduce performance-related design patterns, components, and software design ideas that help improve performance.
Java program optimization
Introduce how to write high-performance Java code from the code level. The main content involved are string optimization, file I/O optimization, the use of core database structure, Java reference types, and some commonly used conventions.
Parallel program development and optimization
Introduce related content of parallel program development and how to improve system performance through multithreading. Has introduced the concurrent design evaluation mode, thread pool, the use of concurrent data structures, concurrency control methods, the optimization of "lock", the use of lock-free, and coroutines.
JVM tuning
Based on the JVM virtual machine level, introduces how to improve the performance of Java programs by setting reasonable JVM parameters.
Java performance tuning tool
It mainly introduces various tools for obtaining and monitoring program or system performance indicators, as well as troubleshooting tools related to Java applications.
to sum up
If an online product has not been tested for performance, it is like a time bomb. You don't know when it will have problems, and you don't know where it can withstand the limit. It can be said that performance tuning is one of the necessary skills for our programmers! If you don't know where to start when learning performance optimization, then these two documents should be able to help you!
Friends who need these two documents only need help:
——Like the article , follow me and add a small assistant to get it
