From: Nicolas Pitre <nico@cam.org>
Date: Wed, 22 Apr 2009 23:07:42 GMT
Subject: Re: Performance issue: initial git clone causes massive repack
Message-ID: <alpine.LFD.2.00.0904221858370.6741@xanadu.home>
In-Reply-To: <49EF93CA.20207@vilain.net>

On Thu, 23 Apr 2009, Sam Vilain wrote:

> Nicolas Pitre wrote:
> >> Now that the GSoC projects have been announced I can give you the good
> >> news that one of our two projects is to optimise this stage in
> >> git-daemon; I'm hoping we can get it down to being almost as cheap as
> >> the workaround you described in your post. I'll certainly be using your
> >> repository as a test case :-)
> >
> > Please keep me in the loop as much as possible. I'd prefer we're not in
> > disagreement over the implementation only after final patches are posted
> > to the list.
> 
> Thanks Nico, given your close working knowledge of the pack-objects
> code this will be very much appreciated. Perhaps you can first help
> out by telling me what you have to say about moving object enumeration
> from upload-pack to pack-objects?

It is like a 25-line patch or so.  I did it once, although the shalow 
clone support was missing from it.  And somehow I managed to lose the 
patch while doing some reshuffling of unrelated bigger changes.

Basically, you can pass the revision arguments to pack-objects directly 
instead of passing them to rev-list and piping rev-list's output to 
pack-objects.

Nicolas