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Re: WCNG - Upgrading working copies

From: Stefan Sperling <stsp_at_elego.de>
Date: Fri, 26 Nov 2010 15:06:37 +0100

On Fri, Nov 26, 2010 at 08:58:48AM -0500, Mark Phippard wrote:
> On Fri, Nov 26, 2010 at 8:02 AM, Stefan Sperling <stsp_at_elego.de> wrote:
> > On Fri, Nov 26, 2010 at 02:05:55PM +1000, Daniel Becroft wrote:
> >> Hi,
> >>
> >> I'm currently trialling the nightly builds that Stefan is providing for
> >> TSVN, which include the new WCNG implementation. So far, it all looks good.
> >> It takes a few minutes extra to checkout a working copy, but the day-to-day
> >> performance difference (to me) is not noticeable. Good stuff!
> >>
> >> One thing I did notice, though, is the performance of the 'svn upgrade'
> >> functionality. It seems to take, on average, 3x longer to upgrade an
> >> existing working copy than to just delete and checkout again.
> >>
> >> Checkout (1.6.x): 9 minutes
> >> Checkout (1.7.x): 14 minutes
> >> Upgrade (1.7.x): 43 minutes
> >>
> >> Is this kind of performance hit during an upgrade expected? Is the
> >> recommended upgrade option expected to be to use 'svn upgrade' or do get a
> >> fresh checkout?
> >>
> >> If you need stats regarding the working copy, I can provide them.
> >
> > Please keep benchmarking and reporting your results.
> > The current state of wc-ng development is, AFAIK, that we're still
> > working out some final steps in the implementation. We're not yet at
> > the point where we're heavily trying to optimize the new code.
> > But any report about slowness will help once we've reached that point.
> > Keep them coming.
>
> It seems like Daniel is more asking if this might be indicative of a
> bug. Does it ever make sense that svn upgrade would take that long?
> Without any need to fetch pristines from the repository as checkout
> needs to do, it seems hard to believe that it should take that long.
> I can imagine scenarios where we have to calc new checksums or open
> and re-read entry data over and over again but 43 minutes?
>
> Daniel, is your working copy on a local hard drive?

Yes, these performance problems are certainly bugs.
Neels has made more performance measurements recently, similar to the
ones he shared on this list a few weeks ago.
The current performance is pretty disappointing, not just for upgrade.

I suppose you're right that we should be starting to look into these
problems ASAP. They can be fixed without having op_depth and the
conflict store finished.

Stefan
Received on 2010-11-26 15:07:17 CET

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