Re: Compression speed for large files

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On 7/3/06, Nicolas Pitre <nico@xxxxxxx> wrote:
On Mon, 3 Jul 2006, Joachim Berdal Haga wrote:

> Alex Riesen wrote:
> > On 7/3/06, Joachim B Haga <cjhaga@xxxxxxxxxx> 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)

It would be arguable whether, say, 10% better compression is worth
x(3-8) slower compression. But 3-4% better compression at the cost of
x(3-8) slower compression time as data suggest ? I think this begs
for switching the default to Z_DEFAULT_COMPRESSION

Yakov
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