Re: Why so much time in the kernel?

From: Nicolas Pitre <nico@cam.org>
Date: Jun 16, 2006, 18:07 UTC
Message-ID: <Pine.LNX.4.64.0606161406260.16002@localhost.localdomain>
In-Reply-To: <9e4733910606161044h736c9675kc91ff77904c5a1d0@mail.gmail.com>

On Fri, 16 Jun 2006, Jon Smirl wrote:

Show 16 quoted lines

> On 6/16/06, Keith Packard <keithp@keithp.com> wrote:
> > On Fri, 2006-06-16 at 13:00 -0400, Jon Smirl wrote:
> > > Is it a crazy idea to read the cvs files, compute an sha1 on each
> > > expanded delta and then write the delta straight into a pack file? Are
> > > the cvs and git delta formats the same? What about CVS's forward and
> > > reverse delta use?
> > 
> > At this point, merging blobs into packs isn't a significant part of the
> > computational cost. parsecvs is spending all of its time in the
> > quadratic traversal of the diff chains; fixing that to emit all of the
> > versions in a single pass should speed up that part of the conversion
> > process dramatically.
> 
> That's not true for the state I am in. cvsps can compute the changeset
> tree in 15 minutes, cvs2svn can compute their version in a couple of
> hours. cvs2svn builds a much better tree.

Did you try parsecvs recently?

Nicolas