[Rpm-ecosystem] Proposed zchunk file format

[Michael Schroeder]

On Wed, Feb 28, 2018 at 09:31:39AM +0200, Jonathan Dieter wrote:
> On Fri, 2018-02-23 at 14:14 +0000, Michael Schroeder wrote:
> > This may be an unfair question, but how does it compare to the
> > 'gzip --rsyncable' + zsync approach that we (openSUSE) are
> > using since almost eight years? I guess it's better, but how much?
> 
> Ok, here are some numbers comparing zsync and zchunk.  For testing, I
> have eight f27-updates primary.xml files dating from Dec 7 until Feb
> 12.  3-6 are on consecutive days in mid-January, while 7 and 8 are two
> days apart in mid-February.

The gzip --rsyncable + zsync approach only makes sense when the repository
metadata is ordered so that new packages come last. Did you do that in
your tests?

Thanks,
  Michael.

-- 
Michael Schroeder                                   mls at suse.de
SUSE LINUX GmbH,           GF Jeff Hawn, HRB 16746 AG Nuernberg
main(_){while(_=~getchar())putchar(~_-1/(~(_|32)/13*2-11)*13);}