是否有可能改变垃圾收集器线程的优先级？ [英] Is it possible to change the priority of garbage Collector thread?

问题描述

Java垃圾收集器以优先级1运行，因此无法保证如果调用System.gc（）将实际执行。

有什么方法可以改变它的优先权吗？垃圾收集器是一个独立的线程（如汤姆霍廷在评论中，甚至不一定是一个单一的线程），它的优先级由Java虚拟机决定。这意味着你不能强制垃圾收集。调用 System.gc（）会告诉运行时环境，now可能是运行GC的好时机，但垃圾收集实际上不能保证立即完成。

Java garbage collector runs with priority 1, due to which it is not guaranteed that System.gc() will actually execute if called.

Is there any way to change its priority? This shall enable me to run if I want.

解决方案

Garbage Collector is an independent thread (as reminded by Tom Hawtin in a comment, not even necessarily a single thread) and is on a priority which is decided by the Java Virtual Machine. This means you can't force garbage collection. Calling System.gc() tells the runtime environment that "now" might be a good time to run the GC but garbage collection is actually not guaranteed to be done immediately.

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