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[protege-owl] performance problems

Amal Zouaq amal.zouaq at gmail.com
Sat Apr 7 08:27:59 PDT 2007


Hello Timothy,
Thank you very much for your answer. I will try the solutions that you
suggested. I will also try to experience the deletion in the instance tab
instead of the individual tab.
Regards,
Amal.


2007/4/6, Timothy Redmond <tredmond at stanford.edu>:
>
>
> I think that your problem with the deletions is occurring because of an
> interaction with the graphical interface.  My suspicion is that the way
> you are running your code the graphical interface is getting updated
> after each deletion.  I ran the following code:
>
>        int count = 300;
>        OWLModel owlModel = ProtegeOWL.createJenaOWLModel();
>
>        OWLNamedClass c = owlModel.createOWLNamedClass("top");
>        OWLIndividual[] individuals = new OWLIndividual[count];
>        for (int i = 0; i < count; i++) {
>            individuals[i] = c.createOWLIndividual("myInstance" + i);
>        }
>        System.out.println("created class " + c + " with " +
> c.getInstanceCount(false) + " members");
>        System.out.println("Starting deletions");
>        long start = System.currentTimeMillis();
>        for (int i = 0; i < count; i++) {
>            individuals[i].delete();
>        }
>        System.out.println("took " + (System.currentTimeMillis() -
> start)  + "ms");
>        System.out.println("class " + c + " now has " +
> c.getInstanceCount(false) + " members");
>
> This reported doing 300 deletions in 172 milliseconds.  This gets
> relatively good performance because the graphical interface is not
> getting updated on each delete.
>
> So the fix to your problem depends on exactly what you are doing.
> Controlling how the graphical interface responds to changes in the
> knowledge base depends on event processing.  If you are running a long
> running thread you may want to do something like
>
>   1. disable event generation and reload the gui
>   2. disable event dispatch for the duration of the thread.
>
> The problem with option #2 is that when the event dispatch is turned on
> again a lot of processing must be done.  Here is a skeleton that uses
> option #1:
>
>        boolean eventGeneration=
> getKnowledgeBase().setGenerateEventsEnabled(false);
>        boolean undoEnabled = getKnowledgeBase().setUndoEnabled(false);
>        try {
>            ...
>        } finally {
>            getKnowledgeBase().setUndoEnabled(undoEnabled);
>            getKnowledgeBase().setGenerateEventsEnabled(eventGeneration);
>        }
>
> ProjectManager.getProjectManager().getCurrentProjectView().reloadAll();
>
> Also there is apparently a version of the instances tab that handles
> large deletions better than the current version with Protege.  I may be
> able to find a pointer to this.
>
> -Timothy
>
>
> Amal Zouaq wrote:
> > Hello everyone,
> >
> > I was wondering if someone experienced some performance problems with
> > a medium-size or big-size ontology ? When trying to delete the
> > instances (either in Protégé or programmatically), Protégé gets
> > blocked, nothing is happening (the number of instances > 500). By
> > program (Protégé OWL API), it is working but it takes a long time to
> > be completed. Any idea about the problem ( I have set Protégé to 256
> > MO instead of 100 MO) ?.
> >
> > Thanks,
> >
> > Amal.
> > ------------------------------------------------------------------------
> >
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