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如何在OpenJDK中禁用垃圾回收线程？

[英]How to disable garbage collection threads in OpenJDK?

原文 2019-08-13 09:56:44 8 1 java/ garbage-collection

I'm working on a JVM project where I need to disable garbage collection in JVM and get the out of memory error. 我正在一个JVM项目上，我需要在JVM中禁用垃圾收集并获取内存不足错误。

When we call system.gc(), GC gets called after sometime and I also wrote a program which invokes GC without calling system.gc(). 当我们调用system.gc（）时，GC会在一段时间后被调用，我还编写了一个调用GC而不调用system.gc（）的程序。 And it seems like they both follow the different call stacks while invoking GC. 似乎它们在调用GC时都遵循不同的调用堆栈。

I need to disable the GC for my research project purpose and how can I do that. 我需要出于研究项目目的而禁用GC，以及如何执行此操作。

Where do GC threads get scheduled in the OpenJDK code for the program which doesn't call system.gc() explicitly. 在未明确调用system.gc（）的程序的OpenJDK代码中，GC线程在何处进行调度。

I'm using OpenJDK 11. 我正在使用OpenJDK 11。

1 个解决方案

There is no way to disable garbage collection entirely. 无法完全禁用垃圾收集。 Java 11 comes with an Epsilon (no-op garbage collector). Java 11带有Epsilon （无操作垃圾收集器）。 In JEP 318: 在JEP 318中：

Develop a GC that handles memory allocation but does not implement any actual memory reclamation mechanism. 开发一个可以处理内存分配但不实现任何实际内存回收机制的GC。 Once the available Java heap is exhausted, the JVM will shut down. 一旦可用的Java堆耗尽，JVM将关闭。

So, after a while will see the out of memory error. 因此，过一会儿就会看到内存不足错误。 It can be enabled by the -XX:+UseEpsilonGC option at JVM start. 可以在JVM启动时通过-XX:+UseEpsilonGC选项启用它。