Just a guess, but this might be caused by the changes Yaron made for allowing SIO to hook into the RDF export.
Jeroen De Dauw
Don't panic. Don't be evil. 50 72 6F 67 72 61 6D 6D 69 6E 67 20 34 20 6C 69 66 65!
I turned off recursive export and backlink export at the end of my LocalSettings.php file and the RDF export remains just as big.
On Jun 27, 2010, at 9:34 AM, Markus Krötzsch wrote:
> On Sonntag, 27. Juni 2010, Laurent Alquier wrote:
>> I set my PHP timeout limit to a very high value and let the RDF export run
>> its course.
>> The file was eventually generated, apparently without error.
>> The RDF export contains what I expected to see - a list of properties for
>> that one page.
>> It also contains things I did not expect in that file - every pages that
>> this page links to is also included in the file, along with their own
>> Is that how the RDF export is supposed to be ?
> This behaviour should normally be configurable and be disabled by default.
> Maybe some change in SMW 1.5.1 affected the according setting or the place
> where it is taken into account. Maybe you can check if the settings at 
> need to be changed on your site.
> -- Markus
>  http://semantic-mediawiki.org/wiki/Help:Configuration#OWL.2FRDF_export
>> On Jun 24, 2010, at 7:31 PM, Laurent Alquier wrote:
>>> Hi all
>>> Has anyone experienced poor performance on RDF exports since the upgrade
>>> to 1.5.1 ?
>>> Most of my pages flat out time out on the Special:ExportRDF page, even
>>> after bumping up PHP timeouts to 240 seconds.
>>> On pages that do come out (pages with only a handful of properties
>>> declared... as in less than 5) the RDF file seems to contain more details
>>> than I remember. In particular, I don't remember seeing that many details
>>> about pages linked to from the current page.
>>> Can someone familiar with the internals of the RDF export double check
>>> that things are ok ?
>>> I don't have a very high number of properties or properties values
>>> compared to some other SMW instances I know of. I didn't notice any slow
>>> down in SMW queries either, and Special:Browse is very responsive.
>>> The problem seems to be contained to ExportRDF so far.
> Markus Krötzsch <email@example.com>
> * Personal page: http://korrekt.org
> * Semantic MediaWiki: http://semantic-mediawiki.org
> * Semantic Web textbook: http://semantic-web-book.org
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