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Re: Proposal: new fsfs.conf properties

From: Paul Hammant <paul_at_hammant.org>
Date: Tue, 11 Jul 2017 09:20:52 -0400

Markus - I've read your section on deltification and I can see evidence in
what you wrote that you're concurrently in favor of and against it (the
file-suffix exclusion idea). Can you re-read and clarify?

Thanks,

- Paul

On Tue, Jul 11, 2017 at 8:53 AM, Markus Schaber <m.schaber_at_codesys.com>
wrote:

> Hi,
>
> (Sorry, it seems my previous message was sent _very_ prematurely :-(
>
> From: Pavel Lyalyakin [mailto:pavel.lyalyakin_at_visualsvn.com]
> > Hello Paul,
> >
> > On Sat, Jul 8, 2017 at 2:51 AM, Paul Hammant <paul_at_hammant.org> wrote:
> > >
> > > 1. compression-exempt-suffixes = mp3,mp4,jpeg
> > >
> > > 2. deltification-exempt-suffixes = mp3,mp4,jpeg
> > >
> > > Regardless of the setting of 'compression-level', #1 above two mean
> certain
> > things can skip the compression attempt. It must give up at a certain
> point
> > right?
> > >
> > > Same for deltification re #2
> > >
> > > I'm assuming debate happens now. Then y'all let me go off and
> diligently
> > file a Jira ticket for this feature request, or I slink away suitably
> > admonished...
> > >
> > > - Paul
> >
> > I'm not sure whether this is going to be useful. How do you expect these
> > exemptions to help Subversion users? What's the story?
>
> I agree partly. Skipping compression for known "incompressible" formats
> like mpX, png or gif can come with performance benefits, saving some CPU
> cycles (see the recent performance disccussions on this list)
>
> However, I'm not sure whether the same amounts for deltification. There
> are editing tasks which do not reencode the whole image / movie, and they
> can profit from deltification, for example:
>
> - Lossless rotation / cropping of jpeg images.
> - Editing / stripping the EXIF data of jpeg images.
> - Embedding / dropping the preview thumbnail of jpeg images.
> - Lossless MP3 editing (e. G. via mp3DirectCut).
> - Editing MP3 meta data (e. G. Song Title)
> (... and more...)
>
> In all those cases, skipping deltification can drastically increase
> storage.
>
>
> Best regards
>
> Markus Schaber
>
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Received on 2017-07-11 15:39:52 CEST

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