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Re: Indentation and gc
From: |
Ihor Radchenko |
Subject: |
Re: Indentation and gc |
Date: |
Sat, 11 Mar 2023 13:31:04 +0000 |
Eli Zaretskii <eliz@gnu.org> writes:
>> With the main risk being that we could go OOM, could Emacs evaluate the
>> available memory on the system on systems that support that check?
>
> It can, but what would you want to do with that value?
>
> We cannot use it as the threshold, for the reasons I explained
> earlier. We could use some fraction of it, but what fraction? The
> answer depends on what other programs routinely run on that system.
> For example, if the user is likely to run another full-fledged session
> of Emacs (some people actually do that, e.g., to run Gnus in a
> separate process), then using 1/2 of the amount of VM as the threshold
> is out of the question, right? And there are memory-hogging programs
> out there which use much more than Emacs does.
What is the smallest practical free RAM available to Emacs on low-end systems?
We can take that value and then use 800kb/min free RAM in the wild and
the base threshold. On system with larger RAM the threshold will scale.
As a speculation, let's assume that the minimal sane memory we can
encounter is 128Mb. Then, 800kb correspond to ~0.7% RAM.
For systems with a lot of RAM, Say 128Gb, 0.7% corresponds to 890Mb.
Probably a bit much and will cause memory fragmentation
What about the default being:
(pcase (* (car (memory-info)) ; in kb
1000)
(`nil 800000) ; 800kb, old default
(ram
(let ((scaled-threshold
(* 0.7e-2 ; 800kb/128Mb for low-end systems.
ram)))
(min
(* 100 1000 1000) ; upper limit to avoid fragmentation
scaled-threshold))))
--
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
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- Indentation and gc, Ergus, 2023/03/10
- Re: Indentation and gc, Dr. Arne Babenhauserheide, 2023/03/10
- Re: Indentation and gc, Eli Zaretskii, 2023/03/10
- Re: Indentation and gc, Dr. Arne Babenhauserheide, 2023/03/10
- Re: Indentation and gc, Eli Zaretskii, 2023/03/11
- Re: Indentation and gc, Dr. Arne Babenhauserheide, 2023/03/11
- Re: Indentation and gc, Eli Zaretskii, 2023/03/11
- Re: Indentation and gc, Dr. Arne Babenhauserheide, 2023/03/11
- Re: Indentation and gc, Eli Zaretskii, 2023/03/11
- Re: Indentation and gc,
Ihor Radchenko <=
- Re: Indentation and gc, Eli Zaretskii, 2023/03/11
- Re: Indentation and gc, Ihor Radchenko, 2023/03/11
- Re: Indentation and gc, Eli Zaretskii, 2023/03/11
- Re: Indentation and gc, Ihor Radchenko, 2023/03/12
- Re: Indentation and gc, Eli Zaretskii, 2023/03/12
- Re: Indentation and gc, Ihor Radchenko, 2023/03/12
- Re: Indentation and gc, Eli Zaretskii, 2023/03/12
- Re: Indentation and gc, Ihor Radchenko, 2023/03/13
- Re: Indentation and gc, Eli Zaretskii, 2023/03/13
- Re: Indentation and gc, Ihor Radchenko, 2023/03/13