强制或生成jvm核心转储（IBM JVM） [英] force or generate jvm core dump ( IBM JVM )

问题描述

可能重复：

我可以强制生成JVM崩溃日志文件吗？

如何在Java应用程序服务器上或一般情况下强制或生成JVM核心转储？

How can I force or generate a JVM core dump on an Java application server or in general?

推荐答案

问题（摘要）：要诊断与在WebSphere Application Server Community Edition上运行的客户应用程序的挂起或性能不佳相关的问题，用户需要生成各种转储并发送它们到IBM支持诊断。

Problem(Abstract): To diagnose the problems related to hang or poor performance of customer applications running on WebSphere Application Server Community Edition, users would be required to generate the various dumps and send them to IBM Support for diagnosis.

此技术说明解释了当WebSphere Application Server Community Edition作为操作系统服务运行时如何生成所需的转储。此技术说明适用于IBM Java SDK 1.5.0和IBM Java SDK 1.6.0

This technote explains how to generate required dumps when WebSphere Application Server Community Edition is running as an operating system service. This technote applies to IBM Java SDK 1.5.0 and IBM Java SDK 1.6.0

原因：当客户应用程序遇到挂起或性能不佳时IBM Java SDK 1.5.0或IBM Java SDK 1.6.0上的WebSphere Application Server Community Edition，并且服务器作为操作系统服务运行，用户无法使用服务器进程的相应命令/ shell窗口。因此，无法从键盘发送用户信号以触发转储。

Cause: When customer applications experience hang or poor performance with WebSphere Application Server Community Edition on IBM Java SDK 1.5.0 or IBM Java SDK 1.6.0, and the server is running as an operating system service, the corresponding command/shell window of the server process is not available to users. As a result, user signals can not be sent from the keyboard to trigger dumps.

解决问题：当JVM进程命令窗口为可用，生成转储如下：

Resolving the problem: When the JVM process command window is available, generating dumps is straight forward as follows:

Windows：
如果JVM设置配置为触发用户转储信号，在命令窗口按 CRTL + Break 以生成转储。

Linux：如果JVM设置配置为在用户信号处生成转储，请在shell窗口中按 CTRL + \ 。

Linux: If the JVM setting is configured to generate the dumps at user signal, press CTRL+\ on the shell window.

AIX：如果JVM设置配置为在用户信号下生成转储，请在shell窗口中按 CTRL + \ 。

AIX: If the JVM setting is configured to generate the dumps at user signal, press CTRL+\ on the shell window.

注意：为了在用户信号下生成java核心转储，系统核心转储，堆转储和快照转储，必须通过JVM选项配置转储代理，如下所示： / p>

Note: In order to generate java core dump, system core dump, heap dump and a snap dump at user signal, the dump agents must be configured through JVM options as follows:

-Xdump:java+heap+system+snap:events=user

有关如何配置转储代理的更多信息，请访问 -Xdump 。

For more information on how to configure dump agents, visit using -Xdump.

但是，如果WebSphere Application Server Community Edition作为操作系统服务运行，则命令窗口可能不可用。在Windows上使用javaw.exe启动JVM进程时也会出现这种情况。

However, if WebSphere Application Server Community Edition is running as an operating system service, the command window may not be available. This case will also arise when JVM process is started with javaw.exe on windows.

在前面的情况下，用户需要找到JVM的相应进程ID按照以下步骤处理和使用操作系统供应商提供的或IBM提供的工具来生成转储。

In the preceding circumstances, user is required to find the corresponding process-id of the JVM process and use operating system vendor supplied or IBM supplied tools to generate the dumps by following the below steps.

Windows： WinDbg可以从以下位置下载Microsoft Dev工具站点生成系统核心转储。在WinDbg控制台上使用以下命令生成系统核心转储：

Windows: WinDbg can be downloaded from Microsoft Dev tools site to generate system core dumps. Use the following command at the WinDbg console to generate the system core dump:

dump /f <dumpfile> 

其中dumpfile包含目录路径和系统核心转储文件的名称。
确保使用 / f 选项代替 / ma 。 / f 生成完全转储，其中 / ma 生成小型转储。 IBM Java SDK 1.5.0 / 1.6.0提供的jextract工具仅支持完全转储。

Where dumpfile includes the directory path and the name of the system core dump file. Make sure that /f option is used instead of /ma. The /f generates full dump where as /ma generates mini dump. Only full dumps are supported with the jextract tool supplied with IBM Java SDK 1.5.0/1.6.0.

Windows的SendSignal实用程序。为此，必须设置JVM以生成用户信号的转储。要在用户信号处生成Java核心转储，堆转储，系统核心转储和快照转储，必须在启动时向JVM提供以下选项：

SendSignal utility for Windows. For this, the JVM must be setup to generate the dumps on user signals. To generate the java core dump, heap dump, system core dump and a snap dump at user signal, the following option must be supplied to JVM at startup:

-Xdump:java+heap+system+snap:events=user 

注意：SendSignal实用程序可用于生成所有类型的转储，其中WinDbg仅生成系统核心转储。

Note: The SendSignal utility can be used to generate all types of dumps where as WinDbg generate only system core dumps.

Linux和AIX ：Linux和AIX的信号是 SIGQUIT 。使用该命令发送用户信号以触发各种转储：

Linux and AIX: The signal for Linux and AIX is SIGQUIT. Use the command to send the user signal to trigger the various dumps:

kill -3 <PID>  

为此，必须设置JVM以在用户信号上生成转储。要在用户信号处生成Java核心转储，堆转储，系统核心转储和快照池，必须在启动时向JVM提供以下选项。

For this, JVM must be setup to generate the dumps on user signal. To generate the java core dump, heap dump, system core dump and a snap sump at user signal, the following option must be supplied to JVM at startup.

-Xdump:java+heap+system+snap:events=user 

注意：必须使用jextract工具处理系统核心转储文件，并且必须将输出发送给IBM支持人员。应该使用来自遇到问题的同一JVM的jextract来处理系统核心转储：

Note: System core dump files must processed using the jextract tool and the output must be send to IBM support. The jextract from the same JVM that experienced the problem should be used to process the system core dump:

<JAVA_HOME>/jre/bin/jextract <dumpfile>   

其中dumpfile是系统核心转储的文件名。

Where dumpfile is the filename of the system core dump.

这将产生一个zip文件.zip。需要将zip文件发送给IBM支持。

This will produce a zip file .zip. The zip file needs to be sent to IBM support.

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