[Myexperiment-discuss] Re: rdf.MyExperiment server performance problems?

[Edgar Meij]

Hi David,

Yes, it seems to be better now. I'll let you know if I run into this  
again.

Thanks,

Edgar

--
Informatics Institute   - University of Amsterdam
Kruislaan 403           - room F1.08
1098 SJ Amsterdam       - The Netherlands
W:+31 20 525 75 65      - M:+31 62 464 2619

On Oct 7, 2009, at 4:55 PM, David R Newman wrote:

> Hi Edgar/Scott,
>
> Sorry I didn't get back to you sooner. Are you still experiencing  
> these problems?  The SPARQL endpoint has a JENA backend and  
> sometimes the garbage collection isn't very good if a lot of complex  
> queries have been run in a short space of time.  However this is  
> monitored and the connection to the triplestore is restarted within  
> an hour if this occurs.
>
> Doing a quick test on some trivial queries seems to be alright.   
> Could you send me some examples of the query you have been trying to  
> run and I will see if I can figure out what the problem is.
>
> Regards
>
> David Newman
>
> --On Monday, October 05, 2009 22:26:00 +0200 "M. Scott Marshall" <address@hidden 
> > wrote:
>
> > Hi David,
> >
> > Are there known performance issues with the rdf.MyExperiment server
> > SPARQL endpoint? Edgar seems to be experiencing timeouts and slow
> > behavior.
> >
> > Scott wrote:
> > > > > Any progress on the consumption of REST services or search across
> > > > > repositories?
> > Edgar wrote:
> > > > As to the multiple repo's, I'm still squeezing things into ExtJS...
> > > > I've  made a start with two REST services (which are both REST
> > > > endpoints of  virtuoso) and I can do simple queries now. However,  
> > > > it's
> > > > verrrry slow  and I don't know whether that's the REST stuff, or  
> > > > the
> > > > actual server I'm  querying. One other thing I noticed is that the
> > > > rdf.MyExperiment server  is painstakingly slow. Even using a  
> > > > browser
> > > > and trivial query, the  response times out. Have you heard this  
> > > > before
> > > > or could it be just me?
> > Scott wrote:
> > > Egads! No idea. It could very well be untuned servers with not  
> > > enough of
> > > anything but I don't know. But I suspect it's the actual server +
> > > config. I'll sniff around for you if I get a chance. Can you  
> > > supply me
> > > with more detail about the virtuoso services? What version of  
> > > Virtuoso?
> > > On what ~hardware? As far as myExperiment, I will paste this into a
> > > message to David Newman and Jits (aka Jiten Bhagat).
> >
> > Cheers,
> > Scott
> >
> > --
> > M. Scott Marshall
> > Leiden University Medical Center / University of Amsterdam
> > http://staff.science.uva.nl/~marshall