Mailinglist Archive: opensuse-factory (904 mails)

["Francis Giannaros" <francis@xxxxxxxxxxxx>]

On 05/04/2008, Carlos E. R. <robin.listas@xxxxxxxxxxxxxx> wrote:
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> The Saturday 2008-04-05 at 15:50 +0200, Stephan Kulow wrote:
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> > Am Samstag, 5. April 2008 schrieb Carlos E. R.:
> >
> > > Hi,
> > >
> > > Each week I do a "zypper dup" of factory it means downloading about 1.6
> > > GiB, meaning a minimum of 4 hours, probably 8. Would it be possible to
> > > reduce the size somehow? Deltas, perhaps?
> >
> > Yeah, we have some ideas what to do, but no time to do it. One thing we
> > did already was switching to lzma, which saves some of the download size.
> > Deltas are another, but that needs some effort to be done correctly.
>
> Another improvemennt would be separating the download and the install on
> diferent threads or whatever, so that the next rpm is been downloaded while
> another is beeng installed.

This was something proposed for ZYpp, but I'm not sure quite what
happened. Parallel downloads in addition to this (like Smart) would
help, too.

> Higher compression also means longer time decompressing, thus longer time
> not downloading and perhaps longer overall time. Mmmm! That would be curious
> to measure!

See http://www.kdedevelopers.org/node/3326 for some figures and explanation.

Higher compression doesn't have to necessitate either longer time
decompressing or even longer time compressing -- it depends on the
efficiency of your algorithm.

In this case, LZMA gives considerable benefits for both the size and
the speed of decompression in comparison to bzip2.

Kind thoughts,
-- 
Francis Giannaros   http://francis.giannaros.org
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