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On Fri, 15 May 2015 08:23:27 -0700 |
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Dirkjan Ochtman <djc@g.o> wrote: |
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> On Fri, May 15, 2015 at 7:51 AM, Michał Górny <mgorny@g.o> |
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> wrote: |
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> > Starting with Portage 2.2.19, a new SquashDelta syncing method has |
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> > been introduced. It is meant to provide lightweight and efficient |
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> > solution for stable systems. The whole repository is contained |
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> > within a single pre-generated SquashFS image file. The daily |
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> > snapshot of the repository is first fetched from the mirrors, and |
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> > afterwards updated in-place using deltas (without repacking). |
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> |
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> This sounds nice, but the news item currently leaves me wondering what |
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> sort of improvements I should expect. It says the new method is |
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> "lightweight and efficient", but it would be nice to quantify this a |
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> little bit, or add a link to a page with more details. I think the |
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> default sync method in the handbook up to now has always been rsync? A |
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> comparison (both in terms of upside and in terms of downside) would be |
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> nice. Also, whether we want to make this the new default at some |
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> point, and if so, when. |
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> |
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> Cheers, |
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> |
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> Dirkjan |
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> |
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> |
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I've read the pdf article of Michał Górny and from my expirience with |
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emerge-delta-webrsync and app-portage/getdelta in the past this good old |
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new feature looks mostly useful for bad Internet connections (too slow |
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or too expensive ones) and looks mostly useless for syncing |
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relative to rsync method from local mirror like I use |
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http://mirror.yandex.ru/gentoo-distfiles/ |
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from my local region. |
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eix-sync gave me the following statistics (before introducing new |
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portage sync with repos.conf wich has stopped upgrade in the middle atm |
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because >=app-portage/layman-2.3.0 haven't been stabilised yet): |
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* Time statistics: |
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19 seconds for syncing |
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17 seconds for eix-update |
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1 seconds for eix-diff |
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51 seconds total |
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or this one the other day: |
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* Time statistics: |
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37 seconds for syncing |
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11 seconds for eix-update |
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1 seconds for eix-diff |
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67 seconds total |
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So it takes usually 15-40 seconds for syncing using usual rsync method. |
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This deltas have their own drawbacks like "delta is under generation, |
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please wait half an hour or even more" or "your state is not the same |
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what was while generating delta on the host and lets do additional work |
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with more deltas". )) |
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|
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Although, nice try with experimenting and trying to improve sync |
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mechanism. ) |
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