From: nobu@...
Date: 2014-12-13T09:11:47+00:00
Subject: [ruby-core:66826] [ruby-trunk - Bug #10537] Repeated creation and garbage collection of WeakRef instances against a single object leaks memory

Issue #10537 has been updated by Nobuyoshi Nakada.


Yes, I confirmed the performance difference too.
I have no idea why it is slow, though.

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Bug #10537: Repeated creation and garbage collection of WeakRef instances against a single object leaks memory
https://bugs.ruby-lang.org/issues/10537#change-50393

* Author: Alex Boyd
* Status: Closed
* Priority: Normal
* Assignee: 
* Category: lib
* Target version: 
* ruby -v: ruby 2.2.0dev (2014-11-24 trunk 48552) [x86_64-darwin14]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN
----------------------------------------
~~~ruby
require 'weakref'
a = Object.new
1_000_000.times do
  WeakRef.new a
end
GC.start
~~~

The above results in Ruby consuming ~150 MB of RAM, all of which can only be freed by dropping `a`. This should not be the case - an object being weakly referenced should not itself hold a reference to the WeakRef (or any associated data) pointing at it.



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