Hi Vanessa,
Goog to hear the FD_SET issues is resolved. Strange it would not occur on Mac
though as its default FD_SETSIZE is 256 rather than 1024 as is the case on
Linux, unless it is set higher on your Mac (ulimit -n) ?
To get closer to an exact match you could try using the optional "OPTION (score
...)" specifier for the bif:contains function to rank and score the results as
detailed at:
http://docs.openlinksw.com/virtuoso/rdfiridereferencing.html#rdfiridereferencingfaceter
Although for an exact label match it is better to perform an equality check ...
Best Regards
Hugh Williams
Professional Services
OpenLink Software
Web: http://www.openlinksw.com
Support: http://support.openlinksw.com
Forums: http://boards.openlinksw.com/support
Twitter: http://twitter.com/OpenLink
On 16 Sep 2010, at 14:52, Vanessa Lopez wrote:
> Hi Hugh,
>
> Yes I also increased the number of ServerThreads because, together with the
> maximum number of file descriptors, Virtuoso was displaying a message
> suggesting to increase the ServerThreads. When increasing the ServerThreads,
> the last message disappeared but I still had a problem with the file
> descriptors.
>
> Anyway, your email made me think that the problem was that I was not closing
> the connections to Virtuoso properly, my application is a NL interface, and
> there are some heavy user queries that send more than 2000 sparql calls to
> Virtuoso .. and yes, that was the problem! It is solved now :-) .. ( I did
> not have this problem when I was using my Mac, only on the Linux server)
>
> Thanks a lot!!!, I am very please with Virtuoso, it handles my 2000 queries
> in (almost) real time, without any tuning.
>
> I just have some problems with the indexes / full text searches, for
> instance, when querying for "museum " in DBpedia:
>
> SELECT DISTINCT ?s ?o ?type FROM <http://dbpedia.org> WHERE {{?s rdfs:label
> ?o. ?s rdf:type ?type .FILTER( bif:contains(?o, "museum" ) )}}LIMIT 350
>
> I get the exact mapping: http://dbpedia.org/property/museum (label: museum)
> after position 300, behind approximate mappings like
> "Intrepid_Sea-Air-Space_Museum", "National_Museum_of_the_American_Indian",
> "British_Museum", etc.. Is there any way to get exact mappings first? I
> created the indexes in the following way:
>
> DB.DBA.RDF_OBJ_FT_RULE_ADD('http://dbpedia.org', null, 'dbpedia');
> DB.DBA.VT_INC_INDEX_DB_DBA_RDF_OBJ();
>
> Thanks again!
> Vanessa
>
>
> On 15 Sep 2010, at 23:08, Hugh Williams wrote:
>
>> Hi Vanessa,
>>
>> Where are you encountering this error ?
>>
>> FD_SET is the file descriptor set whose maximum size is determine by the
>> FD_SETSIZE parameter which is typically 1024 on Unix systems, so I assume
>> you are exceeding this some how. Have you increased any of he parameters in
>> your virtuoso configuration file (virtuoso.ini) like ServerThreads for
>> example which would result in a large number of file descriptors being
>> opened to the point of exceeding the FD_SETSIZE maximum ?
>>
>> Best Regards
>> Hugh Williams
>> Professional Services
>> OpenLink Software
>> Web: http://www.openlinksw.com
>> Support: http://support.openlinksw.com
>> Forums: http://boards.openlinksw.com/support
>> Twitter: http://twitter.com/OpenLink
>>
>> On 15 Sep 2010, at 21:55, Vanessa Lopez wrote:
>>
>>> Hello,
>>>
>>> Does anyone knows how to solve the problem
>>>
>>> "Exceeded maximum number of file descriptors in FD_SET."
>>>
>>> in Virtuoso? I install Virtuoso under Linux RedHat
>>>
>>> Thanks a lot
>>> V
>>>
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>>
>
