Java is an object – oriented programming language, with powerful functions, simple and easy to use two characteristics. Many people say that Java runs slowly and has serious performance problems. In fact, this has nothing to do with Java, but relates to the performance optimization of Java applications. Here are some common ways to optimize Java performance.
1. Design optimization.
Design optimization is the upper layer of performance optimization and needs to be done before software development. Before software development, the system architect should evaluate various potential problems and technical difficulties that may exist in the system, and give a reasonable design plan, which is to optimize the “quality” of the system. In design optimization, designers must be familiar with frequently used design methods, design patterns, as well as major performance components and frequently used optimization ideas, and integrate them organically into the software system.
2. Code optimization.
Code tuning is the improvement and optimization of program code during software development or during software maintenance after software development. Code optimization involves a lot of coding skills, requiring developers to be familiar with the relevant language API, and the correct use of relevant API or class library in the appropriate scenario, while the flexible use of algorithms and data structures is also an important content of code optimization.
3. JVM optimization.
As the execution platform of Java software, JVM parameters, such as JVM heap size, garbage collection strategy, and so on, directly affect the performance of Java programs. Tuning at the JVM level requires an understanding of how the JVM executes and the basic memory structure, such as heap memory structure, GC types, and so on, and then setting appropriate JVM startup parameters based on the characteristics of the referenced program.
4. Database optimization.
Tuning a database can be divided into three parts: 1) Tuning SQL statements at the application layer involves a great deal of programming skill; 2) The main purpose of database optimization is to establish a database with a good table structure; 3) Optimize the database software.
5. Optimization of operating system.
Operating system tuning methods and parameters may vary. For example, on mainstream Unix systems, shared memory segments, semaphores, shared memory maximum (SHmmax), shared memory minimum (SHmmin), and so on are system resources that can be optimized. In addition, parameters such as the maximum number of file handles, virtual memory size, and disk block size may affect the performance of the software.