Ruby Class对象垃圾收集 [英] Ruby Class object garbage collection

问题描述

在ruby中，所有的类都是Class类的对象。由于类也是对象，Ruby VM是否遵循类对象的垃圾收集策略？什么决定了类对象对于垃圾收集是安全的？

解决方案

一个更具体的例子，类似于Andrew Cholakian的答案是使用ObjectSpace。例如：

  2.1.1：001> ObjectSpace.count_objects [：T_CLASS] 
 => 884 
 2.1.1：002> 10000.times {Class.new} 
 => 10000 
 2.1.1：003> ObjectSpace.count_objects [：T_CLASS] 
 => 20884 
 2.1.1：004> GC.start 
 =>无
 2.1.1：005> ObjectSpace.count_objects [：T_CLASS] 
 => 884 
  

这表明匿名类（不是保存在任何地方的常量中，或者被这些类的任何实例使用）确实收到垃圾。

In ruby all classes are objects of class Class. Since classes are also objects, does a Ruby VM follow the same Garbage Collection strategy for class objects? What determines that a class object is safe for garbage collection?

解决方案

An even more concrete example, similar to Andrew Cholakian's answer is to use ObjectSpace. For example:

2.1.1 :001 > ObjectSpace.count_objects[:T_CLASS]
 => 884 
2.1.1 :002 > 10000.times { Class.new }
 => 10000 
2.1.1 :003 > ObjectSpace.count_objects[:T_CLASS]
 => 20884 
2.1.1 :004 > GC.start
 => nil 
2.1.1 :005 > ObjectSpace.count_objects[:T_CLASS]
 => 884 

This shows that anonymous classes (not saved in a constant anywhere or used by any instances of those classes) do indeed get garbage collected.

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