Java 堆转储 - jsm-所有GC.heap_dump

发布于 2025-01-10 09:36:33 字数 460 浏览 4 评论 0原文

根据文档，jcmd 命令没有 -all 选项。 https://docs.oracle.com/javase/ 8/docs/technotes/guides/troubleshoot/tooldescr006.html

使用 -all 选项执行 jcmd。 GC没有触发，GC日志中看不到【Full GC（Heap Dump Initiated GC）。
使用 -all 选项执行 jcmd。 GC被触发，可以在GC日志中看到【Full GC（Heap Dump Initiated GC）。

-all 选项是否有任何特定行为且文档中未提及。

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养猫人 2025-01-17 09:36:33

要获取有关 jcmd（子）命令的帮助，请使用“help command”，但请注意，您仍然必须指定 pid 以满足 jcmd 的正式命令行模式，即

jcmd 0 help GC.heap_dump

打印

GC.heap_dump
Generate a HPROF format dump of the Java heap.

Impact: High: Depends on Java heap size and content. Request a full GC unless the '-all' option is specified.

Permission: java.lang.management.ManagementPermission(monitor)

Syntax : GC.heap_dump [options] <filename>

Arguments:
        filename :  Name of the dump file (STRING, no default value)

Options: (options must be specified using the <key> or <key>=<value> syntax)
        -all : [optional] Dump all objects, including unreachable objects (BOOLEAN, false)
        -gz : [optional] If specified, the heap dump is written in gzipped format using the given compression level. 1 (recommended) is the fastest, 9 the strongest compression. (INT, 1)

^{（使用JDK 17.0.2+8测试）}

To get help on a jcmd (sub)command, use “help command”, but note that you still have to specify a pid to meet jcmd’s formal command line pattern, i.e.

jcmd 0 help GC.heap_dump

which prints

GC.heap_dump
Generate a HPROF format dump of the Java heap.

Impact: High: Depends on Java heap size and content. Request a full GC unless the '-all' option is specified.

Permission: java.lang.management.ManagementPermission(monitor)

Syntax : GC.heap_dump [options] <filename>

Arguments:
        filename :  Name of the dump file (STRING, no default value)

Options: (options must be specified using the <key> or <key>=<value> syntax)
        -all : [optional] Dump all objects, including unreachable objects (BOOLEAN, false)
        -gz : [optional] If specified, the heap dump is written in gzipped format using the given compression level. 1 (recommended) is the fastest, 9 the strongest compression. (INT, 1)

^{(tested with JDK 17.0.2+8)}

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