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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Memory Usage On Emacs 24 Lucid Linux:
Date: Mon, 12 Mar 2012 23:06:23 +0200
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To: Stefan Monnier <monnier@IRO.UMontreal.CA>
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> From: Stefan Monnier <monnier@IRO.UMontreal.CA>
> Date: Mon, 12 Mar 2012 16:33:23 -0400
> Cc: emacs-devel@gnu.org
> 
> Hmm... there's a bug in the above output: it should say 1000738985 bytes
> of vector slots.  That a whole 1G of vector slots.  Where could these
> come from?

Putting a breakpoint on allocate_vectorlike and looking at the Lisp
backtrace should probably bring the answer to that pretty fast.