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Re: [Emacs-diffs] /srv/bzr/emacs/trunk r109187: Adjust consing_since_gc

From: Stefan Monnier
Subject: Re: [Emacs-diffs] /srv/bzr/emacs/trunk r109187: Adjust consing_since_gc when objects are explicitly freed.
Date: Tue, 24 Jul 2012 05:11:05 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.1.50 (gnu/linux)

>> What helps?  Adding those calls to free_marker, or adding the "decrement
>> consing_since_gc in free_marker"?  I can believe the first, but I doubt
>> the second will make much of a difference.
> Local: both conses and markers are allocated very often, and
> explicitly freed ones most probably will be re-used again very soon,
> at the cost of link to/unlink from the free lists, thus avoiding
> possible new block allocation.
> Global: Ideal GC manages an infinite amount of memory so the
> collection is never started. For the real cases, some time periods are
> more advisable for running GC (when we're idle, for example); but,
> since we can't predict when "more advisable" time comes, it's the best
> bet to run GC as later as possible for the same amount of work.

I do not understand how that answers my question.
So to repeat: do you claim that "decrement consing_since_gc in
free_marker" helps performance?  If so, do you have concrete
measurements showing it?


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