Explore the features and functions of JVM monitoring tools and improve application performance optimization techniques!

In-depth analysis of the functions and features of JVM monitoring tools to help you optimize your application!

When developing and deploying Java applications, we often need to monitor and tune the performance of the application. The JVM monitoring tool is an important tool to help us achieve this goal. This article will deeply analyze the functions and characteristics of JVM monitoring tools, and use specific code examples to allow readers to better understand and apply these tools and effectively tune their own applications.

JVM monitoring tool is a tool used to monitor the running status and performance indicators of the Java virtual machine (JVM). They can provide rich information, such as memory usage, thread status, garbage collection status, etc., to help us find problems and optimize performance. Commonly used JVM monitoring tools include JConsole, VisualVM and JMC (Java Mission Control).

First, let’s introduce JConsole. JConsole is a lightweight monitoring tool that comes with JDK, with the advantages of ease of use and real-time performance. We can monitor the application's memory usage, thread status, garbage collection, etc. in real time through JConsole. The following is an example of using JConsole to monitor:

public class JConsoleDemo {
    public static void main(String[] args) throws InterruptedException {
        byte[] bytes = new byte[128 * 1024 * 1024];

        // 模拟长时间运行的线程
        new Thread(() -> {
            while (true) {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }).start();

        // 保持程序运行，方便监控
        Thread.sleep(Long.MAX_VALUE);
    }
}

We can use JConsole to monitor this sample program through the following steps:

1. Open the command prompt and enter the JDK's binUnder contents.
2. Enter the jconsole command to open the JConsole tool.
3. Select the running Java process in JConsole and click the "Connect" button.
4. In the "Overview" tab, we can see the application's memory usage, thread information, etc.

Next, let us introduce VisualVM. VisualVM is a powerful all-in-one virtual machine monitoring and performance analysis tool that can interact with local or remote Java applications. VisualVM is characterized by extensibility and plug-in support, and corresponding plug-ins can be installed according to different needs. The following is an example of using VisualVM monitoring:

public class VisualVMDemo {
    public static void main(String[] args) throws InterruptedException {
        byte[] bytes = new byte[64 * 1024 * 1024];

        // 使用VisualVM插件的示例
        ProfilerPlugin profilerPlugin = new ProfilerPlugin();
        profilerPlugin.start(bytes);

        // 模拟长时间运行的线程
        new Thread(() -> {
            while (true) {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }).start();

        // 保持程序运行，方便监控
        Thread.sleep(Long.MAX_VALUE);
    }
}

We can use VisualVM to monitor this sample program through the following steps:

1. Open the command prompt and enter the bin# of VisualVM ##Under contents.
Enter the
2. visualvm command to open the VisualVM tool.
Select the running Java process in VisualVM and click the "Connect" button.
3. In the "Monitor" tab, we can see the application's memory usage, thread information, etc.
4. In the "Plug-ins" tab, we can choose to install and start the Profiler plug-in to perform performance analysis.

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