Better compression

[Robert Collins]

On Thu, 2008-07-17 at 16:00 +1000, Rob Weir wrote:
> On 17 Jul 2008, raindog at macrohmasheen.com wrote:
> > What level perf increase is seen with this? Do you have any
> > comparissons?  Sent from my Verizon Wireless BlackBerry
> 
> With regards to space, I converted bzr.dev from pack-0.92 to
> btree+groupcompress:
> 
> 85664   backup.bzr
> 40232   .bzr/
> 
> a saving of over 50%.
> 
> -rob

The compressor would have been getting texts in topological order there.
It does much better with reverse-topological order, which is why I need
a new InterRepository object or something... I tested a bzr.dev
repository and saw more like 30 MB with better ordering in use, but it
was a custom-hack rather than a reusable thing.

-Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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