Re: Compression speed for large files

From: Nicolas Pitre <nico@cam.org>
Date: Jul 3, 2006, 14:33 UTC
Message-ID: <Pine.LNX.4.64.0607031030150.1213@localhost.localdomain>
In-Reply-To: <44A91C7A.6090902@fys.uio.no>

On Mon, 3 Jul 2006, Joachim Berdal Haga wrote:

Show 19 quoted lines

> Alex Riesen wrote:
> > On 7/3/06, Joachim B Haga <cjhaga@fys.uio.no> wrote:
> > > So: is it a good idea to change to faster compression, at least for larger
> > > files? From my (limited) testing I would suggest using Z_BEST_COMPRESSION
> > > only for small files (perhaps <1MB?) and
> > > Z_DEFAULT_COMPRESSION/Z_BEST_SPEED for
> > > larger ones.
> > 
> > Probably yes, as a per-repo config option.
> 
> I can send a patch later. If it's to be a per-repo option, it's probably too
> confusing with several values. Is it ok with
> 
> core.compression = [-1..9]
> 
> where the numbers are the zlib/gzip constants,
>   -1 = zlib default (currently 6)
>    0 = no compression
> 1..9 = various speed/size tradeoffs (9 is git default)

I think this makes a lot of sense, although IMHO I'd simply use Z_DEFAULT_COMPRESSION everywhere and be done with it without extra complexity which aren't worth the size difference.

Nicolas