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