From: Lars Ingebrigtsen <larsi@gnus.org>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 33275@debbugs.gnu.org
Subject: bug#33275: 27.0.50; Image cache pruning
Date: Mon, 05 Nov 2018 20:06:41 +0100 [thread overview]
Message-ID: <m3ftwfgx8e.fsf@gnus.org> (raw)
In-Reply-To: <83lg67crrq.fsf@gnu.org> (Eli Zaretskii's message of "Mon, 05 Nov 2018 20:18:17 +0200")
Eli Zaretskii <eliz@gnu.org> writes:
>> It would be reasonable if the code had asked for those images to be kept
>> in memory, but it hasn't. Emacs decides that on its own without saying
>> that it's doing that.
>
> You cannot assume anything about memory management while a Lisp
> program runs.
In general, if you don't have a reference to an object, you can be
pretty sure that Emacs is going to garbage-collect it. If you can't
assume that, then programming in Emacs Lisp becomes impossible.
Fortunately that's not the case, and programming in Emacs Lisp is nice
and easy.
>> It'd be similarly surprising if
>>
>> (dolist (file (directory-files "/directory/with/many/images" t "png$"))
>> (with-temp-buffer
>> (insert-file-contents-literally file)))
>>
>> were to lead to Emacs growing uncontrollably.
>
> That it doesn't is just sheer luck: the way we manage buffer memory is
> special. With any other Lisp object, it could well grow
> uncontrollably.
What other non-referenced Lisp object can realistically make Emacs grow
in this way?
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
next prev parent reply other threads:[~2018-11-05 19:06 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-05 14:07 bug#33275: 27.0.50; Image cache pruning Lars Ingebrigtsen
2018-11-05 16:05 ` Eli Zaretskii
2018-11-05 16:18 ` Lars Ingebrigtsen
2018-11-05 16:23 ` Eli Zaretskii
2018-11-05 16:35 ` Lars Ingebrigtsen
2018-11-05 17:27 ` Eli Zaretskii
2018-11-05 17:36 ` Lars Ingebrigtsen
2018-11-05 17:48 ` Lars Ingebrigtsen
2018-11-05 18:14 ` Eli Zaretskii
2018-11-05 18:35 ` Eli Zaretskii
2018-11-05 19:13 ` Lars Ingebrigtsen
2018-11-05 19:28 ` Eli Zaretskii
2018-11-09 12:22 ` Lars Ingebrigtsen
2018-11-06 15:40 ` Eli Zaretskii
2018-11-09 12:26 ` Lars Ingebrigtsen
2018-11-10 9:48 ` Eli Zaretskii
2019-09-21 8:18 ` Lars Ingebrigtsen
2018-11-05 18:18 ` Eli Zaretskii
2018-11-05 19:06 ` Lars Ingebrigtsen [this message]
2018-11-05 19:24 ` Eli Zaretskii
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