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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.bugs
Subject: Re: the ...-unload-hook convention doesn't work
Date: Fri, 16 Jan 2004 14:54:31 -0500
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    Essentially: how do I find out what is taking up all memory in Emacs?
    Perhaps a package that report these things would be handy.

I wish I knew.  However, I am surprised your mapatoms runs out
of space.  It looks like all it will do is add a line
to the buffer for a fairly small subset of symbols.

It would be interesting to debug were most of the consing goes
inside that mapatoms.  Maybe running that code with a breakpoint
in malloc would show you where.

It might be due to undo entries.