Shulou(Shulou.com)06/02 Report--

Java performance tuning is a headache. Why do you say that? Today, a simple system includes applications, databases, containers, operating systems, networks and other technologies. Once there are performance problems online, you may have to coordinate various components to optimize. In addition, many performance problems are hidden deeply, either because of a small code or because of the wrong type of thread pool.

Layer 1: Java programming performance tuning

JDK is the basic library of the Java language. Familiarity with the utility classes in various packages in JDK can help you write high-performance code. The course starts with the basic data types, covering the tuning of containers in practical application scenarios, as well as the tuning of network communications, which is more important in the current Internet system architecture.

Layer 2: multithreaded performance tuning

At present, most of the servers are multi-core processors, and multi-thread programming is widely used. In order to ensure the safety of threads, synchronous locks are usually used, which will bury a lot of hidden dangers for the system; in addition, there are performance problems caused by high concurrency of multithreads, which will be explained at this level.

Layer 3: JVM performance monitoring and tuning

Java applications run on JVM, and tuning JVM can improve system performance. This level focuses on the creation and recycling of Java objects, memory allocation, and so on.

Layer 4: design pattern tuning

In architecture design, we often use some design patterns to optimize architecture design. Here, Liu Chao will share design optimization cases with some complex application scenarios.

Layer 5: database performance tuning

The database is most likely to become the performance bottleneck of the whole system. Here, Liu Chao will focus on analyzing some common tuning methods of the database.

In addition, for Java performance optimization, we should not only understand the system architecture and application code, but also pay attention to the JVM layer and even the bottom layer of the operating system. Sometimes, a deep understanding of the underlying source code of Java can achieve twice the result with half the effort. In addition to the problems mentioned above, performance tuning also follows some general principles, such as on-demand optimization, 28 principles, creating performance test suites, and so on.

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