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bug#33275: 27.0.50; Image cache pruning

From: Lars Ingebrigtsen
Subject: bug#33275: 27.0.50; Image cache pruning
Date: Mon, 05 Nov 2018 18:48:33 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

Lars Ingebrigtsen <larsi@gnus.org> writes:

> Or does Emacs have weak hashes?  In which case the image cache could be
> a weak hash and the problem would resolve itself?

Emacs does have weak hashes...  Hm...

Anyway, there's code that tries to keep the cache small:

          /* If the number of cached images has grown unusually large,
             decrease the cache eviction delay (Bug#6230).  */
          delay = XFIXNUM (Vimage_cache_eviction_delay);
          if (nimages > 40)
            delay = 1600 * delay / nimages / nimages;

But it works solely on the number of images in the cache, and not the
size of the images.  So it's a heuristic that could be tweaked pretty
easily, I think?

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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