Dnia 2014-01-17, o godz. 23:31:32 Duncan <1i5t5.dun...@cox.net> napisał(a):
> Michał Górny posted on Fri, 17 Jan 2014 20:30:00 +0100 as excerpted:
>
> > Dnia 2014-01-17, o godz. 19:19:14 Duncan <1i5t5.dun...@cox.net>
> > napisał(a):
> >
> >> Michał Górny posted on Fri, 17 Jan 2014 17:27:30 +0100 as excerpted:
> >>
> >> > 96M portage-20140108.sqfs
>
> >> > For deltas [...]
> >> >
> >> > 6,3M portage-20140109.sqfs-portage-20140110.sqfs.vcdiff.djw
>
> >> > applying it takes ~2.5 second on my 2 GHz Athlon64.
> >>
> >> diffs are ~1/16 the full squashfs size[.] So people updating once a
> >> week [or] 10 days would see a bandwidth savings, provided the sync
> >> script was intelligent enough to apply updates serially.
> >>
> >> The breakover point would be roughly an update every two weeks, or
> >> twice a month
> >
> > However, it may be actually beneficial to provide other durations, like
> > weekly deltas. In my tests, the daily updates for this week summed up to
> > almost 50M while the weekly was barely 20M.
>
> That's useful additional data. Thanks.
>
> And yes, a weekly delta would be quite useful, taking the breakover point
> out to about a month or so. Practically speaking, I'd guess most
> gentooers update once a month or more, so that should cover the vast
> majority. Beyond a month, just downloading a new full squashfs makes as
> much sense anyway, and as the cutover would be automated, users on the
> borderline wouldn't have to worry about whether they should just do the
> normal sync or download an entirely new tarball, as they now need to do,
> if they even bother at all. For those users, it'd be an even BIGGER win.
Well, I've got even a better idea and I'll try to provide direct deltas
from N days back to the newest snapshot. Since the tree changes a lot,
those deltas will be smaller to download ;).
Now, does anyone have an old portage-XXXXYYZZ.tar.{bz2,xz} snapshot? I
need the official one from our mirrors, preferably 3-4 months old.
--
Best regards,
Michał Górny
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