From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Eli Zaretskii <eliz@gnu.org>
Cc: sbaugh@catern.com, emacs-devel@gnu.org
Subject: Re: Eager garbage collection
Date: Mon, 16 Nov 2020 13:37:19 -0500 [thread overview]
Message-ID: <jwv1rgtjhhy.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <835z65tg48.fsf@gnu.org> (Eli Zaretskii's message of "Mon, 16 Nov 2020 18:34:47 +0200")
>> This will cause an eager GC right after Emacs goes idle, which can
>> happen while the user is actively typing. I think it would be
>> preferable to run this from an idle timer to make sure that we run
>> during an actual pause of incoming events. Your code effectively uses
>> an idle-time of 0, and I'm not sure what idle-time we should
>> use instead.
>>
>> Admittedly, using an idle time of 0 means we start the GC right at the
>> beginning of the (potentially short) pause, which also makes it more
>> likely that we'll have finished GC before the next event comes in.
>
> Starting GC immediately when Emacs becomes idle will degrade
> responsiveness if there's a lot of garbage, because once GC starts, it
> runs to completion no matter what.
Indeed.
> So maybe this "eager" GC should also be sensitive to the amount of
> garbage, in a sense that it should wait more if there's lot of it.
The time to do a GC doesn't depend on the amount of garbage so much as
the size of the heap, but I think I like your idea. Better yet: keep
track of the time that each GC takes and use that as a guide for the
idle-time delay.
Stefan
next prev parent reply other threads:[~2020-11-16 18:37 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-16 4:11 Eager garbage collection sbaugh
2020-11-16 15:07 ` Stefan Monnier
2020-11-16 16:34 ` Eli Zaretskii
2020-11-16 18:37 ` Stefan Monnier [this message]
2020-11-18 18:00 ` yyoncho
2020-11-18 18:16 ` Eli Zaretskii
2020-11-18 21:37 ` Stefan Monnier
2020-11-18 21:59 ` Stefan Monnier
[not found] <Message-ID: <jwv1rgtjhhy.fsf-monnier+emacs@gnu.org>
2020-11-18 0:20 ` Spencer Baugh
2020-11-18 0:20 ` [PATCH 1/3] Add gc-estimated-time variable Spencer Baugh
2020-11-18 17:45 ` Eli Zaretskii
2020-11-18 0:20 ` [PATCH 2/3] Add garbage-collect-maybe function Spencer Baugh
2020-11-18 17:49 ` Eli Zaretskii
2020-11-18 0:20 ` [PATCH 3/3] Start opportunistic GC timer at startup Spencer Baugh
2020-11-18 17:54 ` Eli Zaretskii
2020-11-18 3:45 ` Eager garbage collection Stefan Monnier
2020-11-18 4:05 ` Spencer Baugh
2020-11-18 4:48 ` Stefan Monnier
2020-11-18 8:02 ` Andrea Corallo via Emacs development discussions.
2020-11-18 15:06 ` Eli Zaretskii
2020-11-18 15:30 ` Andrea Corallo via Emacs development discussions.
2020-11-18 17:19 ` Eli Zaretskii
2020-11-18 17:26 ` Andrea Corallo via Emacs development discussions.
2020-11-18 18:07 ` Eli Zaretskii
2020-11-18 18:19 ` Andrea Corallo via Emacs development discussions.
2020-11-18 15:19 ` Spencer Baugh
2020-11-18 15:47 ` Andrea Corallo via Emacs development discussions.
2020-11-18 16:52 ` Stefan Monnier
2020-11-18 17:12 ` Andrea Corallo via Emacs development discussions.
2020-11-18 17:34 ` Eli Zaretskii
2020-11-18 18:00 ` Eli Zaretskii
2020-11-22 5:07 ` Spencer Baugh
2020-11-22 5:08 ` [PATCH v2 1/3] Add gc-estimated-time variable Spencer Baugh
2020-11-22 18:10 ` Eli Zaretskii
2020-11-22 19:48 ` Stefan Monnier
2020-11-22 5:08 ` [PATCH v2 2/3] Add garbage-collect-maybe function Spencer Baugh
2020-11-22 18:14 ` Eli Zaretskii
2020-11-22 5:08 ` [PATCH v2 3/3] Start opportunistic GC timer at startup Spencer Baugh
2020-12-04 23:19 ` Stefan Monnier
2020-12-05 7:52 ` Eli Zaretskii
2020-12-05 13:55 ` Stefan Monnier
2020-12-05 14:24 ` Eli Zaretskii
2020-12-05 14:41 ` Stefan Monnier
2020-11-22 15:13 ` Eager garbage collection Eli Zaretskii
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