如何在JVM中调试挂起的线程？

问题描述

我正在一个远程Ubuntu服务器上运行一个持久的Java程序，我拥有root用户权限。一段时间后，某些CPU内核的使用率可达100％。日志显示无可疑，应用仍然可行，但吞吐量降低。

如何调试JVM，以便在仍然运行的时候找出原因？

解决方案

一个选项是，它包含在JDK中与Java 1.6。

您可以连接到本地应用程序或远程应用程序。

要连接到远程应用程序，请在远程服务器上运行 jstatd ，然后在本地运行VisualVM并输入服务器的IP地址。您应该获得一个运行中的Java应用程序列表，包括您希望探索的应用程序。如果您在列出应用程序时遇到任何问题，VisualVM网站提供了良好的文档。

I am running a durable Java program on a remote Ubuntu server, where I have root user rights. After some time, the usage on some CPU cores goes up to 100%. The logs show nothing suspicious and the application still works, but with reduced throughput.

How can I debug the JVM so that I can find out the cause of this, while it's still running?

解决方案

One option is VisualVM, which is included in the JDK starting with Java 1.6. I have found it useful in some situations in the past.

You may connect to local applications or remote applications.

To connect to a remote app, run jstatd on your remote server, and then run VisualVM locally and enter your server's IP address. You should be provided with a list of running Java applications including the one you wish to explore. If you have any trouble listing your application, good documentation is available at the VisualVM website.

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