From: "Bruno Félix Rezende Ribeiro" <oitofelix@gnu.org>
To: Eli Zaretskii <eliz@gnu.org>
Cc: dim1212k@gmail.com,
"Bruno Félix Rezende Ribeiro" <oitofelix@gnu.org>,
emacs-devel@gnu.org
Subject: Re: Garbage collector: is 800kb a good default?
Date: Fri, 10 Apr 2020 15:26:49 -0300 [thread overview]
Message-ID: <87h7xrtcwm.fsf@oitofelix.com> (raw)
In-Reply-To: <83blnzmglb.fsf@gnu.org> (Eli Zaretskii's message of "Fri, 10 Apr 2020 19:49:04 +0300")
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Eli Zaretskii <eliz@gnu.org> writes:
>> From: Bruno Félix Rezende Ribeiro <oitofelix@gnu.org>
>> Cc: Dmitrii Korobeinikov <dim1212k@gmail.com>, emacs-devel@gnu.org
>> Date: Fri, 10 Apr 2020 11:26:36 -0300
>> > On GNU/Linux, Emacs doesn't really return malloc'ed memory to the
>> > system, so once the memory footprint grows, it more or less stays that
>> > way even after GC.
>> Really? Why is that?
> Because that's how malloc/free are implemented in glibc.
I’m surprised to find this out and I’m surprised that the GNU system
overall behaves like that (because its C library does).
How is that not a practical problem? Sometimes I deal with very large
buffers, and it’s not uncommon to have an Emacs uptime of more than a
month. This explains what I thought were memory leaks: Emacs
progressively eating large chunks of memory and eventually leading my
machine to die out of starvation.[1]
Can’t we use an alternative allocator that do return freed memory?[2]
Footnotes:
[1] Not good for my dreams of using a perpetual Lisp machine.
[2] IIRC, I read somewhere that the OpenBSD one does. I wonder if this
and the GC behavior in general has something to do with Emacs being
very slow and unresponsive there. It’s a Lemote YeeLoong, but Emacs
worked fine there on GNU/Linux.
--
Bruno Félix Rezende Ribeiro (oitofelix) [0x28D618AF]
<http://oitofelix.freeshell.org/>
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next prev parent reply other threads:[~2020-04-10 18:26 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-09 11:59 Garbage collector: is 800kb a good default? Dmitrii Korobeinikov
2020-04-09 12:33 ` Eli Zaretskii
2020-04-09 13:44 ` Dmitrii Korobeinikov
2020-04-09 14:02 ` Eli Zaretskii
2020-04-09 14:46 ` Dmitrii Korobeinikov
2020-04-09 16:42 ` Eli Zaretskii
2020-04-10 16:40 ` Dmitrii Korobeinikov
2020-04-09 19:05 ` Stefan Monnier
2020-04-10 16:26 ` Dmitrii Korobeinikov
2020-04-09 18:48 ` Stefan Monnier
2020-04-10 14:26 ` Bruno Félix Rezende Ribeiro
2020-04-10 16:49 ` Eli Zaretskii
2020-04-10 18:26 ` Bruno Félix Rezende Ribeiro [this message]
2020-04-10 18:53 ` Paul Eggert
2020-04-09 13:47 ` Stefan Monnier
2020-04-09 14:20 ` Dmitrii Korobeinikov
2020-04-09 14:23 ` Eli Zaretskii
2020-04-09 18:42 ` Stefan Monnier
2020-04-09 19:08 ` Eli Zaretskii
2020-04-09 19:31 ` Stefan Monnier
2020-04-10 6:19 ` Eli Zaretskii
2020-04-10 13:03 ` Stefan Monnier
2020-04-10 13:42 ` Eli Zaretskii
2020-04-10 14:34 ` Stefan Monnier
2020-04-10 14:38 ` Stefan Monnier
2020-04-10 15:37 ` Eli Zaretskii
2020-04-10 15:52 ` Andrea Corallo
2020-04-10 16:45 ` Stefan Monnier
2020-04-10 17:18 ` Andrea Corallo
2020-04-09 14:48 ` Andrea Corallo
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