One thing that issue 2151 does mention is that we shouldn't have any
DeltaV properties in allprop queries, which we currently do. One of
the more expensive ones is "checked-in". Simply removing it causes
"svn list" to fail because it expects it. However, returning a bogus
value, such as simply "/" allows "svn list" to complete sucesfully,
and it does improve the times a whole lot! (note that I don't know how
the rest of subversion reacts to this, I think commit makes use of
"checked-in").
200 file test:
With: 1.09
Without: 0.73
800 file test
With: 6.38
Without: 3.20
1600 file test
With: 20.43
Without: 8.84
The difference in time is pretty important. Also, note that this is in
a VM, times are somewhat different in real world - Still, we are
talking about twice the speed.
An important note is that when removing the "checked-in" property,
traditional dav clients like cadaver also gain a pretty substantial
speed improvement (the server is much speedier).
I do realise that we are getting a bit far from the original issue
here. Removing some of the props have 3 benefits:
1. Making us more "DeltaV" compliant... we don't care so much for this
2. The server responds faster to queries
3. The server needs to send less data
I think part 3 has been the bulk of the issue in Carsten's case. I
doubt that there will be THAT MUCH of a difference by simply removing
the un needed properties in terms of the amount of data... but then
again I could be wrong. As well, with mod_deflate enabled the amount
of data should become less of an issue and #2 would become more
important.
There are a couple "todo"s in issue 2151 which I'll attempt to get to
in the next few days. But as a summary, it *seems* possible to
partially fix Carsten's problem.
Cheers
Jean-Marc Godbout
On 8/21/05, Philip Martin <philip@codematters.co.uk> wrote:
> Jean-Marc Godbout <jmgodbout@gmail.com> writes:
>
> > Actually, I might be wrong about "svn list" after all. After a couple
> > more attempts, here's what I've got:
> >
> > svn - mod_dav_svn == slow
> > cadaver - mod_dav_svn == slow
> > cadaver - mod_dav == fast!
> >
> > The slow part of this equation seems to be mod_dav_svn.
>
> That's issue 2151.
>
> --
> Philip Martin
>
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Received on Mon Aug 22 09:45:21 2005