From: Brian Candler <b.candler@...>
Date: 2008-09-17T23:49:33+09:00
Subject: Re: Threads preventing garbage collection?

Your version only works because the threads are dying after 2 seconds. 
Change

  def make_thread
    Thread.new { sleep 2 }
  end

to

  def make_thread
    Thread.new { sleep 10000 }
  end

and run it again.

The big arrays are happily garbage-collected; the Foos are not.
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