Subject: bug#33275: 27.0.50; Image cache pruning

From: Lars Ingebrigtsen <[email-masked]>
Date: Mon, 05 Nov 2018 18:48:33 +0100

Lars Ingebrigtsen <[email-masked]> 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