Java堆转储&关闭 - 什么命令？ [英] Java heap dump & shut down - what order?

问题描述

我想检测 OutOfMemoryError ，进行堆转储，并自动退出Java程序。假设我的JVM有以下命令行参数：

I would like to detect an OutOfMemoryError, take a heap dump, and automatically exit the Java program. Say I have the following command-line arguments for my JVM:

-XX:OnOutOfMemoryError="kill -9 %p"
-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/usr/tmp

首先发生什么？进程是否转储内存然后退出，或者反过来？

Which happens first? Does the process dump memory and then quit, or the other way around?

推荐答案

我宁愿依赖于调用脚本更确定地处理订购，即

I would rather rely on calling into a script that handles the ordering more deterministically i.e.

-XX:OnOutOfMemoryError="/<SomeStandardLocation>/heapAndQuit.sh"

heapAndQuit.sh然后将使用一种方法来查找 pid 当前的过程。
识别pid的一种简单方法是使用您的进程写入的日志文件位置

heapAndQuit.sh will then employ a method to find the pid of the current process. One simple way to identify the pid is to use the log file location your process is writing to

lsof | grep /var/tmp/<yourlogfileName> | cut -d " " -f1 | uniq

然后我将使用 jmap 转储并且 kill -9 随后

I will then use jmap to dump and kill -9 subsequently

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