垃圾收集瓶颈的例子

问题描述

限时删除！！

我记得有人告诉我一个好的。但我不记得它。我花了最后20分钟与谷歌试图了解更多。

什么是坏/不伟大的代码的例子，导致由于垃圾收集性能打击？

解决方案

来自旧的

  public class Stack {
 private static final int MAXLEN = 10; 
 private Object stk [] = new Object [MAXLEN]; 
 private int stkp = -1; 
 
 public void push（Object p）{stk [++ stkp] = p;} 
 
 public Object pop（）{return stk [stkp--];} 
 
  

以这种方式重写pop方法有助于确保及时完成垃圾回收时尚：

  public Object pop（）{
 Object p = stk [stkp]; 
 stk [stkp--] = null; 
 return p; 
} 
  

I remembered someone telling me one good one. But i cannot remember it. I spent the last 20mins with google trying to learn more.

What are examples of bad/not great code that causes a performance hit due to garbage collection ?

解决方案

from an old sun tech tip -- sometimes it helps to explicitly nullify references in order to make them eligible for garbage collection earlier:

public class Stack {
  private static final int MAXLEN = 10;
  private Object stk[] = new Object[MAXLEN];
  private int stkp = -1;

  public void push(Object p) {stk[++stkp] = p;}

  public Object pop() {return stk[stkp--];}
}

rewriting the pop method in this way helps ensure that garbage collection gets done in a timely fashion:

public Object pop() {
  Object p = stk[stkp];
  stk[stkp--] = null;
  return p;
}

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