ok, I will try! Thanks a lot and have a nice we! Paola
>----Messaggio originale---- >Da: [email protected] >Data: 30/03/2012 15.43 >A: "[email protected]"<[email protected]> >Cc: <[email protected]> >Ogg: Re: Re: Re: Re: Re: Jena slow ontology population > >you can take any tool of your choice but SPARQL updates and Jena API >calls on the model come to mind here, of course. > >so try updates without reasoning and let us know if you experience >performance advantages. > > > >On Fri, Mar 30, 2012 at 9:34 AM, [email protected] <[email protected]> wrote: >> thanks a lot! >> >> Sorry, but what do you mean with "plain update"? >> >> Paola >> >>>----Messaggio originale---- >>>Da: [email protected] >>>Data: 30/03/2012 15.21 >>>A: "[email protected]"<[email protected]> >>>Cc: <[email protected]> >>>Ogg: Re: Re: Re: Re: Jena slow ontology population >>> >>>so why don't you try a plain update and see how that performs? >>> >>> >>>On Fri, Mar 30, 2012 at 8:59 AM, [email protected] <[email protected]> >> wrote: >>>> yes, I insert individuals in every step. >>>> >>>> thanks! >>>> >>>>>----Messaggio originale---- >>>>>Da: [email protected] >>>>>Data: 30/03/2012 14.47 >>>>>A: "[email protected]"<[email protected]> >>>>>Cc: <[email protected]> >>>>>Ogg: Re: Re: Re: Jena slow ontology population >>>>> >>>>>So all updates are A-box related? >>>>> >>>>>On Fri, Mar 30, 2012 at 8:22 AM, [email protected] <[email protected]> >>>> wrote: >>>>>> Thanks a lot for your reply! >>>>>> As you have assumed, I don't use neither TDB or SDB...I have an in >> memory- >>>>>> model at runtime. >>>>>> It seems to me that my model does not require complicate inferences... at >>>> every >>>>>> step, >>>>>> it extracts a tuple from the DB and generates the corresponding >> individuals >>>>>> with: >>>>>> model.createIndividual; the properties are added using the addProperty >>>>>> method. >>>>>> >>>>>> The only thing that can be complicated to be calculated is that, if an >>>>>> individual has the same >>>>>> id of the last one processed, I extract the latter from the ontology to >> add >>>>>> some properties... >>>>>> >>>>>> thanks a lot again! >>>>>> >>>>>> Paola >>>>>> >>>>>> >>>>>> >>>>>>>----Messaggio originale---- >>>>>>>Da: [email protected] >>>>>>>Data: 30/03/2012 13.56 >>>>>>>A: "[email protected]"<[email protected]> >>>>>>>Cc: <[email protected]> >>>>>>>Ogg: Re: Re: Jena slow ontology population >>>>>>> >>>>>>>your hardware looks good, what type of inference does your model >>>>>>>require for updates? >>>>>>> >>>>>>>Pellet is a very powerful reasoning system which can result in >>>>>>>significant computational complexity for the subsystem to deal with >>>>>>>depending on your level of inference that is of course. So you better >>>>>>>know exactly what level of reasoning your application requires in >>>>>>>advance to optimize the system at run-time. >>>>>>> >>>>>>>TBD, SDB are persistent storage options, from what you have just said >>>>>>>I can assume you are using an in-memory model at run-time. >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>>On Fri, Mar 30, 2012 at 7:41 AM, [email protected] <villa.va@libero. it> >>>>>> wrote: >>>>>>>> Hi Marco, thanks a lot for your help! :-) >>>>>>>> >>>>>>>> Version of Jena: 2.6.4 >>>>>>>> OS: Linux 64 bit >>>>>>>> reasoner: Pellet >>>>>>>> TDB and SDB: I don't use them, I believed that they were related to RDF >>>>>> while >>>>>>>> I'm using OWL, but maybe I can be wrong... >>>>>>>> >>>>>>>> current hw: >>>>>>>> *-CPU >>>>>>>> description: CPU >>>>>>>> product: Intel(R) Xeon(R) CPU >>>>>>>> version: Intel(R) Xeon(R) CPU E5620 >>>>>>>> slot: CPU 1 >>>>>>>> size: 2400MHz >>>>>>>> capacity: 2400MHz >>>>>>>> width: 64 bits >>>>>>>> clock: 133MHz >>>>>>>> *-memory >>>>>>>> description: System Memory >>>>>>>> physical id: 24 >>>>>>>> slot: System board or motherboard >>>>>>>> size: 8GiB >>>>>>>> >>>>>>>> If you want to know other information, please tell me! And thanks a lot >>>>>> again! >>>>>>>> >>>>>>>> Paola >>>>>>>> >>>>>>>>>----Messaggio originale---- >>>>>>>>>Da: [email protected] >>>>>>>>>Data: 30/03/2012 11.36 >>>>>>>>>A: <[email protected]>, "[email protected]"<villa. >>>> va@libero. >>>>>>>> it> >>>>>>>>>Ogg: Re: Jena slow ontology population >>>>>>>>> >>>>>>>>>can you please be a bit more specific about the configuration you have >>>>>>>>>currently installed? e.g. version of Jena, back end type (TDB, SDB, >>>>>>>>>in-memory), current hardware, and OS (32bit, 64bit, linux, >>>>>>>>>windows,mac), and type of reasoner you use. >>>>>>>>> >>>>>>>>>--- >>>>>>>>>Marco Neumann >>>>>>>>>KONA >>>>>>>>> >>>>>>>>>Join us at SemTech Biz in San Francisco June 3-7 2012 and save 15% >>>>>>>>>with the lotico community discount code 'STMN' >>>>>>>>>http://www.lotico.com/evt/SemTechSF2012/ >>>>>>>>> >>>>>>>>>On Fri, Mar 30, 2012 at 4:22 AM, [email protected] <villa.va@libero. >> it> >>>>>>>> wrote: >>>>>>>>>> Dear users, >>>>>>>>>> >>>>>>>>>> I am new to Jena and have a problem with Jena OWL-API. I have written >>>>>> some >>>>>>>>>> simple Java code that: >>>>>>>>>> >>>>>>>>>> 1) extracts some tuples (around 1 million tuples) of data from a >>>> database >>>>>>>>>> 2) puts each of them in an ontology file using Jena library. In >>>>>> particular, >>>>>>>> it >>>>>>>>>> takes every tuple and inserts >>>>>>>>>> every element in a class of the ontology file, by using methods like >>>>>>>>>> createIndividual, addproperty, model.write. >>>>>>>>>> >>>>>>>>>> The insertion phase is very quick when my program starts, but the >>>>>>>> performances >>>>>>>>>> became worse and worse as >>>>>>>>>> time goes by. The DB man has told me that the database has no >> problems. >>>> I >>>>>>>> have >>>>>>>>>> run the program with 5 gigabytes >>>>>>>>>> of RAM...it simply ends up to use them all. Is that normal? Do I have >>>> to >>>>>>>> use a >>>>>>>>>> more powerful PC to manage such >>>>>>>>>> data? I can give you more details about my problem if you tell me >> what >>>> I >>>>>>>> have >>>>>>>>>> to look for exactly. >>>>>>>>>> >>>>>>>>>> Thanks a lot, >>>>>>>>>> >>>>>>>>>> Paola >>>>>>>>> >>>>>>>> >>>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>>-- >>>>>>> >>>>>>> >>>>>>>--- >>>>>>>Marco Neumann >>>>>>>KONA >>>>>>> >>>>>>>Join us at SemTech Biz in San Francisco June 3-7 2012 and save 15% >>>>>>>with the lotico community discount code 'STMN' >>>>>>>http://www.lotico.com/evt/SemTechSF2012/ >>>>>>> >>>>>> >>>>>> >>>>> >>>>> >>>>> >>>>>-- >>>>> >>>>> >>>>>--- >>>>>Marco Neumann >>>>>KONA >>>>> >>>>>Join us at SemTech Biz in San Francisco June 3-7 2012 and save 15% >>>>>with the lotico community discount code 'STMN' >>>>>http://www.lotico.com/evt/SemTechSF2012/ >>>>> >>>> >>>> >>> >>> >>> >>>-- >>> >>> >>>--- >>>Marco Neumann >>>KONA >>> >>>Join us at SemTech Biz in San Francisco June 3-7 2012 and save 15% >>>with the lotico community discount code 'STMN' >>>http://www.lotico.com/evt/SemTechSF2012/ >>> >> >> > > > >-- > > >--- >Marco Neumann >KONA > >Join us at SemTech Biz in San Francisco June 3-7 2012 and save 15% >with the lotico community discount code 'STMN' >http://www.lotico.com/evt/SemTechSF2012/ >
