How to Improve the Performance of LinuxJava-Linux general technology-Linux programming and kernel information. Analyzes Java thread heap to solve problems in Java applications. We can use the thread heap to analyze such situations as application suspension, long response time, and program crash. Before giving a detailed introduction to the thread heap technology, let's take a brief look at the thread heap itself.
Analyzes Java thread heap to solve problems in Java applications. We can use the thread heap to analyze such situations as application suspension, long response time, and program crash. Before giving a detailed introduction to the thread heap technology, let's take a brief look at the thread heap itself.
A Java thread heap is a snapshot of all threads of a running Java application. It displays information such as the current stack trace, status, and thread name. The thread list contains the threads created by the JVM itself (responsible for garbage collection, signal processing, and other management work) and the threads created by the application.
By sending a SIGQUIT signal to the JVM, you can get a thread heap. In a Unix operating system (Solaris, Linux, and HP-Unix), run the kill-3 command to obtain the thread heap. After the thread heap is output, the application continues to run normally. When you send SIGQUIT signals to the JVM, the JVM signal processor will respond to this signal through the output thread heap. When the program runs, you can get the thread heap at any point.
An example of thread heap
Listing 1 shows an example of a thread heap in a single-threaded application using Sun JVM 1.4.1. The main thread is the main application thread. All other threads are created by JVM and are responsible for some management work. When analyzing application-level problems, we usually only care about application threads. Next, we will analyze the stack trace of the main thread in Listing 1.
CODE: "main" prio = 5 tid = 0x002358B8 nid = 0x7f8 runnable [6f000 .. 6fc40]
At test. method1 (test. java: 10)
At test. main (test. java: 5) |
