[Attempto] Memory

[Tobias Kuhn]

I am glad to hear that things are working reasonably fast again.

Pellet is called only when reasoning results are requested, i.e. not at start-up but only when a 
page is shown that requires reasoning. And Pellet classifies the whole ontology at the first time it 
is called and may have to reclassify it when the ontology changed.

AceWiki is using the OWL API interface of Pellet. Maybe DIG could be an option for the future.


Tobias


John Gilman wrote:
> It turned out to be not related to memory.  I transferred the ontology from
> Windows to a Linux box by copying the data file, and I think when I tried to
> click on "assignments" it reclassified the ontology, which for this ontology
> takes a bit of time even in Protégé/Pellet.  So I don't think it was an
> AceWiki thing or a memory thing per se, though it would be nice to know when
> AceWiki is classifying the whole ontology.  Once it classified, it ran fine.
> 
> Do you use DIG to talk to the Reasoner?  If so, I could also try RACER.
> 
> Thanks for your prompt reply,
> 
> John
> 
> -----Original Message-----
> From: attempto-bounces at lists.ifi.uzh.ch
> [mailto:attempto-bounces at lists.ifi.uzh.ch] On Behalf Of Tobias Kuhn
> Sent: Thursday, July 16, 2009 10:46 PM
> To: John Gilman; attempto at lists.ifi.uzh.ch
> Subject: Re: [Attempto] Memory
> 
> Hi John,
> 
> I am using the Java arguments -Xmx400m and -Xss4m for the public AceWiki
> instances. Thus, 2048M
> seems to be more than enough.
> 
> Is only reasoning going slow or everything?
> 
> The public AceWiki instances run at reasonable speed but they also get slow
> when the knowledge base
> gets complex. The reasoner Pellet does not always scale nicely.
> 
> AceWiki does not use the latest version of Pellet 2.0 but the older 1.5.2
> for license reasons. So it
> might be that switching to Pellet 2.0 would make AceWiki faster. However, I
> am not sure whether the
> Pellet interface is still 100% the same...
> 
> At some point, I considered using the Hermit reasoner which is claimed to be
> faster than other
> reasoners. But there seems to be a bug, or at least it did not work out for
> AceWiki.
> 
> 
> Tobias
> 
> 
> 
> John Gilman wrote:
>> I've built a small ontology with AceWiki.  I'm running it on 
>> Linux/Tomcat with -Xmx in TomCat set to 2048M, and it seems to be very 
>> slow.  How much memory do you recommend for a medium size ontology?  Is 
>> there some other memory setting I need to change?
>>
>>
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