linux-kernel - Re: Question about your git habits

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Message-ID: <20080223084451.GB2262@martell.zuzino.mipt.ru>
Date:	Sat, 23 Feb 2008 11:44:51 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	"J.C. Pizarro" <jcpiza@...il.com>
Cc:	Al Viro <viro@...iv.linux.org.uk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Question about your git habits

On Sat, Feb 23, 2008 at 03:23:49AM +0100, J.C. Pizarro wrote:
> On 2008/2/23, Al Viro <viro@...iv.linux.org.uk> wrote:
> > On Fri, Feb 22, 2008 at 05:51:04PM -0800, Junio C Hamano wrote:
> >  > Al Viro <viro@...IV.linux.org.uk> writes:
> >  >
> >  > > On Sat, Feb 23, 2008 at 02:37:00AM +0100, Jan Engelhardt wrote:
> >  > >
> >  > >> >do you tend to clone the entire repository repeatedly into a series
> >  > >> >of separate working directories
> >  > >>
> >  > >> Too time consuming on consumer drives with projects the size of Linux.
> >  > >
> >  > > git clone -l -s
> >  > >
> >  > > is not particulary slow...
> >  >
> >  > How big is a checkout of a single revision of kernel these days,
> >  > compared to a well-packed history since v2.6.12-rc2?
> >  >
> >  > The cost of writing out the work tree files isn't ignorable and
> >  > probably more than writing out the repository data (which -s
> >  > saves for you).
> >
> >
> > Depends...  I'm using ext2 for that and noatime everywhere, so that might
> >  change the picture, but IME it's fast enough...  As for the size, it gets
> >  to ~320Mb on disk, which is comparable to the pack size (~240-odd Mb).
> 
> Yesterday, i had git cloned git://foo.com/bar.git   ( 777 MiB )
> Today, i've git cloned git://foo.com/bar.git   ( 779 MiB )
> 
> Both repos are different binaries , and i used 777 MiB + 779 MiB = 1556 MiB
> of bandwidth in two days. It's much!
> 
> Why don't we implement "binary delta between old git repo and recent git repo"
> with "SHA1 built git repo verifier"?
> 
> Suppose the size cost of this binary delta is e.g. around 52 MiB instead of
> 2 MiB due to numerous mismatching of binary parts, then the bandwidth
> in two days will be 777 MiB + 52 MiB = 829 MiB instead of 1556 MiB.
> 
> Unfortunately, this "binary delta of repos" is not implemented yet :|

See git-pull .
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