From: Eric Wong <normalperson@yhbt.net>
Date: Fri, 24 Nov 2006 22:14:35 GMT
Subject: Re: git-svn: why fetching files is so slow
Message-ID: <20061124221435.GA21072@localdomain>
In-Reply-To: <7vy7q0a85p.fsf@assigned-by-dhcp.cox.net>

Junio C Hamano <junkio@cox.net> wrote:
> Eric Wong <normalperson@yhbt.net> writes:
> 
> > Pazu <pazu@pazu.com.br> wrote:
> >> Eric Wong <normalperson <at> yhbt.net> writes:
> >> 
> >> > git-svn transfers full files, and not deltas.  I'll hopefully have a
> >> > chance to look into improving the situation for slow links this weekend.
> >> 
> >> Yes, but why would that make fetching the first revision slower? In this
> >> situation, both svn and git-svn would have to fetch full files. Maybe git-svn
> >> isn't using gzip compression or http pipelining?
> >
> > Even for the initial transfer, the tree is bundled into one big delta
> > (at least over https).
> 
> Do you mean that "one big delta" saves duplicates across copies
> inside the tree (e.g. svn tags and branches can be expressed as
> a mostly identical copies of each other), or do you mean "one
> full file at a time" requests are killing us, compared to a such
> single transfer of "one big delta"?

One full file at a time requests are definitely killing us (over slow
links, at least).  I'm not sure how/if duplicates inside a requested
tree are optimized on the server side.

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