设置 JVM 以在抛出 OutOfMemoryError 时转储堆 [英] Set a JVM to dump heap when OutOfMemoryError is thrown

问题描述

我正在尝试设置我正在使用的服务器的 JVM，因此它会在发生 OOME 时将堆转储到文件中.

我知道我必须将此选项 -XX:-HeapDumpOnOutOfMemoryError 添加到 JVM 参数中的某处，但我不知道如何执行此操作.

仅供参考，我可以通过 PuTTY 访问服务器，所以我正在寻找执行此操作的命令行方式.

我使用的 JVM 是 OpenJDK64 位服务器 VM.

我不知道这是否相关，但该应用程序是一个战争文件.

PS : ps -ef|grep javatomcat 23837 1 0 Mar25 ?00:03:46/usr/lib/jvm/jre/bin/java -classpath :/usr/share/tomcat6/bin/bootstrap.jar:/usr/share/tomcat6/bin/tomcat-juli.jar:/usr/share/java/commons-daemon.jar -Dcatalina.base=/usr/share/tomcat6 -Dcatalina.home=/usr/share/tomcat6 -Djava.endorsed.dirs= -Djava.io.tmpdir=/var/cache/tomcat6/temp -Djava.util.logging.config.file=/usr/share/tomcat6/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager org.apache.catalina.startup.bootstrap 启动

我发现了一些东西，如果我错了，请纠正我:因为我使用的是 Tomcat，所以我决定在 tomcat.conf 文件中添加这些行:

JAVA_OPTS=-XX:-HeapDumpOnOutOfMemoryError

JAVA_OPTS=-XX:HeapDumpPath=/root/dump

JAVA_OPTS=-Xmx20m

你怎么看?

解决方案

HotSpot VM 中的这个选项 选项.我认为它在 OpenJDK VM 中是一样的，但如果不是，请告诉我.

-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=<转储文件的路径>

您也可以使用 jmap 手动生成内存映射，如果您知道进程 ID:

jmap -J-d64 -dump:format=b,file=<转储文件的路径>

您可以使用 JHat 来分析转储.>

jhat <转储文件的路径>

I am trying to set the JVM of the server I am working on, so it dumps a heap to file when an OOME occurs.

I know I have to add this option -XX:-HeapDumpOnOutOfMemoryError to the JVM arguments somewhere, but I can't figure how to do this.

FYI, I can access the server through PuTTY, so I am looking for a command line way of doing this.

The JVM I am using is OpenJDK64-Bit Server VM.

I don't know if that's relevant, but the application is a war file.

PS : ps -ef|grep java

tomcat   23837     1  0 Mar25 ?        00:03:46 /usr/lib/jvm/jre/bin/java -classpath :/usr/share/tomcat6/bin/bootstrap.jar:/usr/share/tomcat6/bin/tomcat-juli.jar:/usr/share/java/commons-daemon.jar -Dcatalina.base=/usr/share/tomcat6 -Dcatalina.home=/usr/share/tomcat6 -Djava.endorsed.dirs= -Djava.io.tmpdir=/var/cache/tomcat6/temp -Djava.util.logging.config.file=/usr/share/tomcat6/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager org.apache.catalina.startup.Bootstrap start

EDIT :

I found something, correct me if I'm wrong : since I am using Tomcat, I decided to add these lines in the tomcat.conf file:

JAVA_OPTS=-XX:-HeapDumpOnOutOfMemoryError

JAVA_OPTS=-XX:HeapDumpPath=/root/dump

JAVA_OPTS=-Xmx20m

What do you think ?

解决方案

This option from the HotSpot VM options. I would think it'd be the same in the OpenJDK VM but let me know if it's not.

-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=<path to dump file>

You can also manually generate a memory map using jmap if you know the process id:

jmap -J-d64 -dump:format=b,file=<path to dump file> <jvm pid>

You can use JHat to analyze the dump.

jhat <path to dump file>

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