On Dec 29, 2007 10:42 AM, Markus Krötzsch <[EMAIL PROTECTED]> wrote:
> On Montag, 17. Dezember 2007, Sergey Chernyshev wrote:
> > Thank you, Markus - it's a really good review! I wonder if there is any
> way
> > to unify performance reporting for all SMW instances so we can compare
> the
> > effects of large data sets, different systems configs (e.g. disabled
> cache
> > and so on) - just looked at profileinfo.php script, it might be an
> answer,
> > actually.
> >
> > I wonder if real Wikipedia set of data (outdated, maybe) is going to be
> set
> > up as a test-case for SMW to handle (with Semantic Templates, of course)
> -
> > I was going to do that, but don't have resources for this. This might
> help
> > to make the goal of "Semantic Wikipedia" more transparent.
>
> In fact we have such a site, but it runs on a rather unstable hardware (we
> have a buggy RAID controller or driver :-(). It is our test server at
> test.ontoworld.org, which also was used for other experiments and is not
> in
> perfect shape right now (and querying was disabled in order to not impair
> other experiments). We might set up another more recent Wikipedia copy
> sometime in some future.
Great, I'll definitely take a look. What were your main discoveries with
English WP and SMW? How many Semantic Templates did you make? I'd say that
I'm mostly interested in volume and performance on relatively simple queries
since this is what most of large projects would need, although complex
queries are also interesting.
It would be quite interesting to see latest WP and latest SMW to understand
biggest pain-points.
>
> > Since we're talking about performance, there is another side of
> performance
> > tuning - percepted performance, this mostly concerns javascripts, css
> and
> > so on - for example there is still a problem of SIMILE Timeline not
> being
> > that fast to load (although performance of pages that didn't have it
> > improved now, when client-side the code is loaded only on pages that
> need
> > it). This kind of issues can be tracked using Firebog with Yahoo's YSlow
> > add-on.
>
> True, and I hope Timeline is really the main performance problem there. I
> wonder whether we could ship a more stripped down version of the scripts
> to
> decrease load time. I guess we should ask the guys over at SAIL for that
> ...
Can you describe modifications you made to original Timeline code? I used it
some time ago and took closer look at how their code is bundled, I might be
able to help to migrate it to new version. BTW, it might make sense to have
SMW code separate from theirs to make such upgrades easier.
>
> > I'll be happy to run the tests on the system with significant amount of
> > data if you need a testbed.
>
> All profiling support is appreciated, but I am not sure how to
> operationalise
> testing on our servers (SQL profiling would probably need server access,
> which is not possible in this case). Insights on JavaScript performance
> are
> also useful, but I guess that MySQL tuning could be most important for
> approaching large sites. I you have know about DB optimisation, you can
> also
> have a look at our DB layout and at the SQL queries we generate
> (format=debug).
Actually I was talking about standardizing some test process that all of us
can run on our servers to compare performance and settings and help each
other to derive best practices in terms of performance and maybe even find
bottlenecks.
Sergey
> Thanks,
>
> Markus
>
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