Re: Git benchmarks at OpenOffice.org wiki

[Johannes Schindelin <Johannes.Schindelin@gmx.de>]

Hi,

On Wed, 2 May 2007, Jan Holesovsky wrote:

> On Tuesday 01 May 2007 23:46, Jakub Narebski wrote:
> 
> > What I am concerned about is some of git benchmark results at Git page
> > on OpenOffice.org wiki:
> >   http://wiki.services.openoffice.org/wiki/Git#Comparison
> > Actually it is comparison with CVS and Subversion, although most
> > benchmarks are done only for git.
> 
> I did the git numbers, so if they are wrong - blame me :-)

Good to have you here!

> > 'Checkout time' (which should be renamed to 'Initial checkout time'),
> > in which git also loses with 130 minutes (Linux, 2MBit DSL) [from
> > go-oo.org], 100min (Linux, 2MBit DSL, Wireless, no proxy) [from
> > go-oo.org] versus 117 minutes (Linux, 2MBit DSL), 26 minutes (Linux,
> > 2MBit DSL, with compression (-z 6)) for CVS, and  60 Minutes (Windows,
> > 34Mbit Line) for Subversion, would also be helped by the above.
> 
> Good point, and I already changed the page in the morning.  I also added the
> checkout time that I got over a fast line [it was 44min].

It took me longer here, but the reason might be that my "local" repository 
is on NFS, due to quota on the machine.

> > What I'm really concerned about is branch switch and merging branches,
> > when one of the branches is an old one (e.g. unxsplash branch), which
> > takes 3min (!) according to the benchmark. 13-25sec for commit is also
> > bit long, but BRANCH SWITCHING which takes 3 MINUTES!? There is no
> > comparison benchmark for CVS or Subversion, though...

I imagine that might be related to the vast amount of remote branches. 
IIRC we do not pack them with git-gc, and ext3 is not that good with big 
directories (remember: 3464 branches!).

Maybe oprofile knows a bit more where the hotspots are.

Ciao,
Dscho