是否可以创建堆转储以分析内存泄漏而无需垃圾回收？ [英] Can heap dump be created for analyzing memory leak without garbage collection?

问题描述

我们在生产中运行Java应用程序的VM上存在一些内存泄漏问题，Old Gen堆使用量每天都在快速增长，所以我想创建堆转储来分析它。

We have some memory leak issues on VMs in production which are running Java applications, the Old Gen heap usage grows fast every day, so I want to create heap dump to analyze it.

但是，我注意到VisualVM将在堆转储之前执行完整的GC，这将清除旧的Gen，在这种情况下，堆转储将是无用的。

However, I noticed that VisualVM will perform full GC before heap dump which will clean the Old Gen, in that case, the heap dump would be useless.

我也尝试使用以下命令：

I also tried to use the following command:

jmap -dump：live，format = b，file = heap.bin

jmap -dump:live,format=b,file=heap.bin

它还会触发一个完整的GC。

It will also trigger a full GC.

请问是否有办法可以在没有完整GC（或没有GC）的情况下创建堆转储？或者有更好的方法来分析内存泄漏吗？

May I ask if there is a way that heap dump can be created without full GC (or without GC)? Or is there any better way to analyze the memory leak?

JDK版本：1.7.0_45

JDK version: 1.7.0_45

谢谢。

推荐答案

要创建堆转储，将有一个Full GC。从堆中创建类直方图时也是如此。

To create a heap dump, there will be a Full GC. The same applies when creating Class histogram out of heap.

如果要分析Full GCs之间的内存泄漏，那么可能内存分析使用Java分析器（Mission Control，jProfiler等）是您唯一的选择。

If you want to analyze memory leak between Full GCs, then probably memory profiling using a Java profiler (Mission Control, jProfiler, etc) is your only option.

有关 Java任务控制堆配置文件。

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