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Re: master afc0bfd380: Speed up loaddefs-generate on slow disks
From: |
Stefan Monnier |
Subject: |
Re: master afc0bfd380: Speed up loaddefs-generate on slow disks |
Date: |
Fri, 03 Jun 2022 08:21:32 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) |
>> This suggests that the kind of change I suggested would make it even
>> a bit faster, tho it should reduce the run time by less than 50%
>> under Windows (because the time to do the `stat`s is apparently already
>> >50% of the total).
>
> I don't know how you deduce the 50% figure.
The old code performed 2*N `stat`s.
The new current code performs N times `time-less-p` and
`file-attributes`, which is N `stat`s plus N times some overhead.
The proposed new functionality would reduce this to more or less just
N `stat`s so it would save us the "some overhead".
Because the old code is slower than the current code, we know that
2*stat > stat + overhead
thus `stat > overhead`. So `overhead` is less than 50% of `stat + overhead`.
Stefan
- Re: master afc0bfd380: Speed up loaddefs-generate on slow disks, Stefan Monnier, 2022/06/02
- Re: master afc0bfd380: Speed up loaddefs-generate on slow disks, Lars Ingebrigtsen, 2022/06/02
- Re: master afc0bfd380: Speed up loaddefs-generate on slow disks, Eli Zaretskii, 2022/06/02
- Re: master afc0bfd380: Speed up loaddefs-generate on slow disks, Stefan Monnier, 2022/06/02
- Re: master afc0bfd380: Speed up loaddefs-generate on slow disks, Eli Zaretskii, 2022/06/03
- Re: master afc0bfd380: Speed up loaddefs-generate on slow disks,
Stefan Monnier <=
- Re: master afc0bfd380: Speed up loaddefs-generate on slow disks, Eli Zaretskii, 2022/06/03
- Re: master afc0bfd380: Speed up loaddefs-generate on slow disks, Stefan Monnier, 2022/06/03
- Re: master afc0bfd380: Speed up loaddefs-generate on slow disks, Eli Zaretskii, 2022/06/03
Re: master afc0bfd380: Speed up loaddefs-generate on slow disks, Lars Ingebrigtsen, 2022/06/04
- Re: master afc0bfd380: Speed up loaddefs-generate on slow disks, Mattias EngdegÄrd, 2022/06/05
- Re: master afc0bfd380: Speed up loaddefs-generate on slow disks, Lars Ingebrigtsen, 2022/06/05
- Re: master afc0bfd380: Speed up loaddefs-generate on slow disks, Lars Ingebrigtsen, 2022/06/06
- Re: master afc0bfd380: Speed up loaddefs-generate on slow disks, Alan Mackenzie, 2022/06/06
- Re: master afc0bfd380: Speed up loaddefs-generate on slow disks, Lars Ingebrigtsen, 2022/06/06
Re: master afc0bfd380: Speed up loaddefs-generate on slow disks, Lars Ingebrigtsen, 2022/06/06