Hello,

So what's the case:

loop do
  Module.new.clone
end

Keeps hogging memory at constant rate, roughly 4mb/s on my machine,
with seemingly no upper limit.

Of course by omitting #clone it stays calm at about 4mb.

I've came up here by tracking Bug #1392 [ruby-core:23252], reported by
oldmoe several months ago. So while in theory the GC may just not
return the memory to the OS but marking it as unused, oldmoe have
posted [ruby-core:23263] a case showing the memory is not reused by
the ruby interpreter.

Tested on:
ruby 1.9.2dev (2009-10-10 trunk 25288) [i686-linux]
ruby 1.9.1p243 (2009-07-16 revision 24175) [i686-linux]

And a friend of mine confirmed for 1.8.7, 1.8.6 on windows.

/ dimitar