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有没有办法使用 ibm-jdk for linux 进行实时堆转储？

发布于 2024-10-06 19:36:01 字数 114 浏览 6 评论 0原文

我知道当 JVM 上发生 OutOfMemoryException 时可以转储堆，但是否可以使用 jmap 或 jconsole 等工具请求实时转储代码>？

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寂寞美少年 2024-10-13 19:36:01

您需要注意，存在“系统”转储（基本上是操作系统核心文件）和“堆”，又名便携式堆转储（PHD）。后面的内容不太有用，因为它们不包含实际数据。然而它们默认是启用的。

在 AIX 或 Linux 上通常，您将设置 -Xdump:system（-Xdump:system:events=gpf+user 的缩写）以允许 kill -3 < ;pid> 触发堆转储。

顺便说一句，您可以使用默认选项 kill -ABRT。然而，这将终止您的 JVM。

运行 java -Xdump:what 来查看默认设置，例如：

> /usr/java6/bin/java -Xdump:what -version

Registered dump agents
----------------------
-Xdump:system:
    events=gpf+abort+traceassert,
    label=/home/u0002824/core.%Y%m%d.%H%M%S.%pid.%seq.dmp,
    range=1..0,
    priority=999,
    request=serial
----------------------
...
java version "1.6.0"
Java(TM) SE Runtime Environment (build pap3260sr9fp2-20110627_03(SR9 FP2))

打开系统转储时：

> /usr/java6/bin/java -Xdump:system -Xdump:what -version

Registered dump agents
----------------------
-Xdump:system:
    events=gpf+user+abort+traceassert,
    label=/home/u0002824/core.%Y%m%d.%H%M%S.%pid.%seq.dmp,
    range=1..0,
    priority=999,
    request=serial
----------------------
-Xdump:heap:
    events=systhrow,
    filter=java/lang/OutOfMemoryError,
    label=/home/u0002824/heapdump.%Y%m%d.%H%M%S.%pid.%seq.phd,
    range=1..4,
    priority=500,
    request=exclusive+compact+prepwalk,
    opts=PHD
----------------------
-Xdump:java:
    events=gpf+user+abort+traceassert,
    label=/home/u0002824/javacore.%Y%m%d.%H%M%S.%pid.%seq.txt,
    range=1..0,
    priority=400,
    request=exclusive+preempt
----------------------
-Xdump:java:
    events=systhrow,
    filter=java/lang/OutOfMemoryError,
    label=/home/u0002824/javacore.%Y%m%d.%H%M%S.%pid.%seq.txt,
    range=1..4,
    priority=400,
    request=exclusive+preempt
----------------------
-Xdump:snap:
    events=gpf+abort+traceassert,
    label=/home/u0002824/Snap.%Y%m%d.%H%M%S.%pid.%seq.trc,
    range=1..0,
    priority=300,
    request=serial
----------------------
-Xdump:snap:
    events=systhrow,
    filter=java/lang/OutOfMemoryError,
    label=/home/u0002824/Snap.%Y%m%d.%H%M%S.%pid.%seq.trc,
    range=1..4,
    priority=300,
    request=serial
----------------------
...

不要忘记在核心上运行 jre/bin/jextract。 * .dmp 文件。

You need to be aware that there are "system" dumps (basically OS core files) and "heap" aka portable heap dumps (PHD). The later ones are less usefull as they do not contain actual data. They are hower enabled by default.

On AIX or Linux Typically you will set up -Xdump:system (short for -Xdump:system:events=gpf+user) to allow kill -3 <pid> to trigger a heap dump.

BTW, you can with the default options use kill -ABRT <pid>. However this will terminate your JVM.

Run java -Xdump:what to see your defaults, like:

> /usr/java6/bin/java -Xdump:what -version

Registered dump agents
----------------------
-Xdump:system:
    events=gpf+abort+traceassert,
    label=/home/u0002824/core.%Y%m%d.%H%M%S.%pid.%seq.dmp,
    range=1..0,
    priority=999,
    request=serial
----------------------
...
java version "1.6.0"
Java(TM) SE Runtime Environment (build pap3260sr9fp2-20110627_03(SR9 FP2))

With turned on system dumps:

> /usr/java6/bin/java -Xdump:system -Xdump:what -version

Registered dump agents
----------------------
-Xdump:system:
    events=gpf+user+abort+traceassert,
    label=/home/u0002824/core.%Y%m%d.%H%M%S.%pid.%seq.dmp,
    range=1..0,
    priority=999,
    request=serial
----------------------
-Xdump:heap:
    events=systhrow,
    filter=java/lang/OutOfMemoryError,
    label=/home/u0002824/heapdump.%Y%m%d.%H%M%S.%pid.%seq.phd,
    range=1..4,
    priority=500,
    request=exclusive+compact+prepwalk,
    opts=PHD
----------------------
-Xdump:java:
    events=gpf+user+abort+traceassert,
    label=/home/u0002824/javacore.%Y%m%d.%H%M%S.%pid.%seq.txt,
    range=1..0,
    priority=400,
    request=exclusive+preempt
----------------------
-Xdump:java:
    events=systhrow,
    filter=java/lang/OutOfMemoryError,
    label=/home/u0002824/javacore.%Y%m%d.%H%M%S.%pid.%seq.txt,
    range=1..4,
    priority=400,
    request=exclusive+preempt
----------------------
-Xdump:snap:
    events=gpf+abort+traceassert,
    label=/home/u0002824/Snap.%Y%m%d.%H%M%S.%pid.%seq.trc,
    range=1..0,
    priority=300,
    request=serial
----------------------
-Xdump:snap:
    events=systhrow,
    filter=java/lang/OutOfMemoryError,
    label=/home/u0002824/Snap.%Y%m%d.%H%M%S.%pid.%seq.trc,
    range=1..4,
    priority=300,
    request=serial
----------------------
...

Do not forget to run jre/bin/jextract on the core. * .dmp files.

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