Re: Git benchmarks at OpenOffice.org wiki

[Julian Phillips <julian@quantumfyre.co.uk>]

On Wed, 2 May 2007, Andy Parkins wrote:

> On Tuesday 2007 May 01, Jakub Narebski wrote:
>
>> In 'Size of data on the server' git has CVS beat hands down: 1.3G vs
>> 8.5G for sources, 591M vs 1.1G for third party. I think it is similar
>> for Subversion. I hope that repository is fully packed: IIRC the Mozilla
>> CVS repository import was about 0.6GB pack file, not 1.3GB.
>
> I'm fairly sure it's not.  If so that would also affect the speed of
> operations wouldn't it?

A fully packed clone of the OOo git repo was indeed 1.3G, and the entrire 
checkout + repo was indeed 8.5G (using git 1.5.1.2).

Took about 46m to clone on a server with decent bandwith, ~5.5m user time, 
~1.5m system.

>
> I also doubt the subversion checkout size - subversion keeps a pristine copy
> of the HEAD file - so a subversion checkout is usually over twice the size of
> the source tree.
>
>> takes 3min (!) according to the benchmark. 13-25sec for commit is also
>> bit long
>
> I wonder if they are measuring the time for the generation of the commit
> message or something?  Or perhaps by using "git-commit -a" is causing a check
> of the whole tree for changed files?
>
>> Comparison / benchmark lacks some crucial info, like what computer was
>> used (CPU, RAM, HDD), what filesystem was used, git version etc. It
>> does have commands used for tests (benchmarks).
>
> I'd also like to see some of the numbers for the other systems, I tried to use
> subversion with the linux kernel once and got fed up waiting for it to do
> anything.  I suspect the reason numbers aren't shown for the others is that
> they haven't finished yet :-)
>
>> Could you confirm (or deny) those results? go-oo.org uses git 1.4.3.4;
>> was there some improvement or bugfix related to the speed of checkout?
>
> Wasn't there a recent change that made repacking after a clone unnecessary?
> That would certainly reduce the checkout size.

Not from the numbers that are quoted it won't, they are fully packed 
sizes.

-- 
Julian

  ---
"Do you have blacks, too?"

George W. Bush
To Brazilian president Fernando Cardoso
November 8, 2001
Washington, D.C.