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Re: [PATCH] FSFS speedup (was: Re: Making blame even faster)

From: Daniel Berlin <dberlin_at_dberlin.org>
Date: 2005-02-14 17:12:23 CET

On Mon, 2005-02-14 at 14:34 +0100, Peter N. Lundblad wrote:
> On Sun, 13 Feb 2005, Daniel Berlin wrote:
>
> >
> > > It depends on your repository, but probably yes.
> > >
> > Just to followup:
> >
> > Brane's timings on windows showed that for the gcc combine.c file (which
> > had ~1500 revisions, spread out across branches, etc), we had
> >
> > blame on an bdb repo with vdelta: 40 seconds
> > blame on an bdb repo with xdelta: 10 seconds
> >
> > blame on an fsfs repo with vdelta: 108 seconds
> > blame on an fsfs repo with xdelta: 105 seconds
> >
> >
> > To fully take advantage of the xdelta speedup on fsfs, you need to
> > implement greg hudson's suggestion of making sure the vdelta rep against
> > empty is *not* combined with other windows, or be willing to give up the
> > first rep being compressed (IE it will store one fulltext in the repo).
> >
> OK. Here we go. On my tests it is a big speedup. I tested on FSFS with and
> without xdelta when the dump was loaded. It seems like we win a lot even
> if vdelta was used to create the repo. Anyway, feel free to fill in the
> missing row above:-)
>

Just FYI, i get a large speedup from this as well, and no longer require
the "don't vdelta against empty source" patch i have locally in order to
get good speed.

With current trunk, without patch, blame on large file locally with repo
using fsfs:

real 1m24.982s
user 1m7.414s
sys 0m6.480

With patch:
real 0m47.240s
user 0m28.449s
sys 0m6.306s

(I have a progress bar printing out how far along it is in getting the
revisions for blame, and you can see it's being given fulltexts *MUCH*
quicker)

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Received on Mon Feb 14 17:14:28 2005

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