Re: [gentoo-dev] Proposal for an alternative portage tree sync method

[Fabian Zeindl <fabian.zeindl@gmx.at>]

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There was a proposal some times ago about replacing the current portage
tree with a database which contains packagenames, dependencies etc. but
no ebuilds with installation instructions.
The ebuild will be downloaded by emerge <package>.

I think this would be a more interesting way of accelerating portage and
reduce load from the rsync-mirrors...

lg
fabian

Ricardo Correia wrote:
> On Tuesday 22 March 2005 12:45, Daniel Drake wrote:
>
>>So on every sync, you have to download the entire 260mb ISO file?
>>
>>I don't think our mirrors would be very happy about that.
>>
>>Daniel
>>--
>>gentoo-dev@gentoo.org mailing list
>
>
> You don't seem to have understanded how zsync works.
>
> Suppose that I, as a user, already have yesterday's portage ISO file.
> And suppose that today, there's about 30 new or updated ebuilds.
> Also suppose that those ebuilds amount to something like 500 KB.
>
> In those conditions, if I update my ISO file today using zsync, I would only
> have to download the zsync file (which would be about 700 KB) and the
> necessary *compressed* ranges of the (compressed) ISO file available on the
> mirror. This would be *less* than 500 KB, because of the compression.
>
> This works because the .zsync file contains a mapping of the uncompressed data
> to the compressed data.
>
> Notice that even if the user doesn't have the ISO file yet, he would only have
> to download about 27 MB.
>
> Personally, I estimate that updates could be faster than a rsync, if not only
> because of the whole disk thrashing. But only through experimentation we
> would be able to measure the difference.
>
> Also notice that zsync still has lots of room for improvements, so I wouldn't
> be surprised to see it beat rsync in terms of time of an update.
>
> I think it's worthwhile to setup an experimental mirror, it sure seems much
> better than doing emerge-webrsync..
> --
> gentoo-dev@gentoo.org mailing list
>
>


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