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Java堆转储（hprof文件）比驻留内存小得多

[英]Java heap dump (hprof file) is much smaller that resident memory

原文 2016-05-01 08:06:35 2 1 java/ garbage-collection/ heap-memory

When running top is see my RES is 4.7GB, which is fine, since I set -Xmx8g , but when I dump it to hprof file, I get about half a gig file. 当运行top时看到我的RES是4.7GB，这很好，因为我设置-Xmx8g ，但是当我将它转储到hprof文件时，我得到大约半个gig文件。

Isn't is suppose to contain all memory ? 不是假设包含所有内存吗？ By the way, even if I force GC (using jcmd) I still see 4.7G resident. 顺便说一句，即使我强制GC（使用jcmd）我仍然看到4.7G常驻。

1 个解决方案

Heap dump file (hprof) is not a memory dump, but object heap dump. 堆转储文件（hprof）不是内存转储，而是对象堆转储。 It contains only java objects. 它只包含java对象。

Heap dump file does not include - non-heap arreas of memory (eg code cache, metaspace, etc) - some heap objects (eg classes) are not included in dump - free regions reserved but not used in heap 堆转储文件不包括 - 内存的非堆区域（例如代码缓存，元空间等） - 某些堆对象（例如类）不包含在保留但未在堆中使用的无转储区域中

In your case, you probably have a lot of unused heap space. 在您的情况下，您可能有很多未使用的堆空间。 GC does not return used space to OS, so RES size remain 4.7G GC不会将已用空间返回到OS，因此RES大小保持为4.7G

Java 堆转储文件 (.hprof) 远大于 eclipse MAT 中的堆大小 - Java heap dump file (.hprof) is much larger than heap size in eclipse MAT

Java 致命错误文件显示 memory 不足，而堆转储要小得多 - Java fatal error file showing insufficient memory while heap dump is much smaller

有没有办法分析截断的Java堆转储（hprof文件）？ - Is there any way to analyze a truncated Java Heap Dump (hprof file)?

为什么我的Java堆转储大小比使用的内存小得多？ - Why is my Java heap dump size much smaller than used memory?

hprof（堆转储大小）远小于分配的堆 - hprof (heap dump size) considerably smaller than heap allocated

JConsole堆转储比内存使用量小得多 - JConsole heap dump much smaller than memory usage

Java HPROF堆转储缺少字段？ - Java HPROF heap dump missing fields?

Java VisualVM是否提供堆转储的正确堆大小（.hprof文件） - Does Java VisualVM gives correct Heap Size of heap dump (.hprof file)

为什么hprof文件的大小要比给jvm的内存量小得多 - why would an hprof file have a much smaller size than the amount of memory given to the jvm

内存不足异常 + 分析 hprof 文件转储 - Out of memory exception + analyzing hprof file dump

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