如何垃圾收集直接缓冲java [英] how to garbage collect a direct buffer java

问题描述

我有一个内存泄漏，我已经隔离到错误处理的直接字节缓冲区。

I have a memory leak that I have isolated to incorrectly disposed direct byte buffers.

ByteBuffer buff = ByteBuffer.allocateDirect(7777777)

GC收集包含这些缓冲区的对象，但不会丢弃缓冲区本身。如果我实例化了足够的包含缓冲区的瞬态对象，我会得到这个令人鼓舞的消息。

The GC collects the objects that harbor these buffers but does not dispose of the buffer itself. If I instantiate enough of the transient objects containing buffers I get this encouraging message.

java.lang.OutOfMemoryError: Direct buffer memory

我一直在搜索这个问题，显然

I have been searching up this problem and apparently

buff.clear

和

 System.gc()

不起作用

推荐答案

我怀疑你的应用程序的某个地方有对ByteBuffer实例的引用，这就是阻止它垃圾收集。

I suspect that somewhere your application has a reference to the ByteBuffer instance(s) and that is preventing it from being garbage collected.

直接ByteBuffer的缓冲区内存是在普通堆之外分​​配的（因此GC不会移动它!!）。但是，ByteBuffer API没有提供显式处理/解除分配缓冲区的方法。所以我假设垃圾收集器会这样做......一旦它确定不再引用ByteBuffer对象。

The buffer memory for a direct ByteBuffer is allocated outside of the normal heap (so that the GC doesn't move it!!). However, the ByteBuffer API provides no method for explicitly disposing of / deallocating a buffer. So I assume that the garbage collector will do it ... once it determines that the ByteBuffer object is no longer referenced.

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