如何使JVM释放内存回到操作系统[重复]

时间：2022-04-16 14:34:32

This question already has an answer here:

这个问题在这里已有答案:

I am using GC options XX:+UseParNewGC-XX:+UseConcMarkSweepGC for my application.

我正在使用GC选项XX:+ UseParNewGC-XX:+ UseConcMarkSweepGC用于我的应用程序。

As most of you are already experiencing JVM is good at increasing heap up to max heap size, however it does not release memory back to OS. I came across -XX:MaxHeapFreeRatio and -XX:MinHeapFreeRatio but these are ignored for Parallel Garbage Collectors.

正如大多数人已经体验到的那样,JVM擅长将堆增加到最大堆大小,但它不会将内存释放回操作系统。我遇到了-XX:MaxHeapFreeRatio和-XX:MinHeapFreeRatio但是对于并行垃圾收集器,这些都被忽略了。

Are there special options to force JVM release memory back to OS for -XX:MaxHeapFreeRatio and -XX:MinHeapFreeRatio combination.

是否有特殊选项可将JVM释放内存强制回OS-Max:MaxHeapFreeRatio和-XX:MinHeapFreeRatio组合。

1 个解决方案

#1

On my Java 1.8.0_45 -XX:+UseG1GC makes memory shrink. This is my test:

在我的Java 1.8.0_45 -XX上:+ UseG1GC使内存缩小。这是我的测试:

    MemoryPoolMXBean m = ManagementFactory.getMemoryPoolMXBeans().get(5);
    System.out.println(m.getName());
    byte[] a = new byte[512 * 1024 * 1024];
    System.out.println(m.getUsage().getCommitted() / 1024 / 1024);
    a = null;
    System.gc();
    Thread.sleep(1000);
    System.out.println(m.getUsage().getCommitted() / 1024 / 1024);

#1

On my Java 1.8.0_45 -XX:+UseG1GC makes memory shrink. This is my test:

在我的Java 1.8.0_45 -XX上:+ UseG1GC使内存缩小。这是我的测试:

    MemoryPoolMXBean m = ManagementFactory.getMemoryPoolMXBeans().get(5);
    System.out.println(m.getName());
    byte[] a = new byte[512 * 1024 * 1024];
    System.out.println(m.getUsage().getCommitted() / 1024 / 1024);
    a = null;
    System.gc();
    Thread.sleep(1000);
    System.out.println(m.getUsage().getCommitted() / 1024 / 1024);
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