They are very important for identifying the performance bottlenecks of your application. They cannot obtain the method-level analytical data, such as the call relationship between different methods, and the frequency and duration that a method is called.However, they have the following drawbacks: You can use any or any combinations of the above command line tools to help you obtain the basic performance information about the target Java application. It allows you to obtain various information about the performance statistics, Java Flight Recorder (JFR), memory usage, garbage collection, thread stacking, and JVM runtime of the target Java process. jcmd - is more comprehensive than jstat.It allows you to obtain various information about loaded classes, Just-In-Time (JIT) compilation, garbage collection, and memory usage of the target Java process. jstat - is a light-weight versatile monitoring tool.jmap - allows you to obtain memory-related information of the target Java process, including the usage of different Java heaps, statistical information of objects in Java heaps, and loaded classes.jstack - allows you to obtain thread stack information of the target Java process, detect deadlocks, and to locate infinite loops.jinfo - allows you to view and tune various parameters of the target JVM in real-time.They can help you obtain information of the target Java virtual machine (JVM) from different aspects and different layers. The Java Development Kit (JDK) offers many built-in command line tools. The following section briefly describes each of these tools. Various performance diagnostic tools are available in the Java world, including simple command line tools, such as jmap and jstat, and comprehensive graphical diagnostic tools, such as JVisualvm and JProfiler. Brief Introduction to Java Performance Diagnostic Tools The JProfiler version discussed in this article is JProfiler10.1.4. This article describes some common Java performance diagnostic tools, and highlights the basic principles and best practices of JProfiler, an excellent representative of these tools. You need an excellent performance diagnostic tool to find these problems. Such factors include thread control, disk I/O, database access, network I/O, and garbage collection (GC).
Many factors may cause performance problems in Java applications. Its performance diagnosis has been attracting a lot of attention across the industry for a long time. Java is one of the most popular programming languages. Today, user experience matters the most, and improving application performance can provide significant advantages.
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Performance diagnosis is a problem that software engineers need to frequently face and solve in their daily work.
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