Hello, please i want UnSubscription, can you help me to remove my email from this list of users of jena please i have any more memory space to receive messages
thank you very much Best regards Samir ----- Mail original ----- De: "Andy Seaborne" <[email protected]> À: [email protected] Envoyé: Mardi 29 Octobre 2013 10:34:16 Objet: Re: Writing big models to disk On 29/10/13 08:02, Nikolaos Konstantinou wrote: > Dear all, > I am trying to write an RDF file to disk, using the following code: Which version of Jena is this? > resultModel.write(new BufferedWriter(new FileWriter("file.rdf")), "N3"); Aside: Better top flush the BufferedWriter explicitly: BufferedWriter x = new BufferedWriter(....) resultModel.write(x, "N3") ; x.flush() ; or close it explicitly. > All works ok when the file is less than 100mb. > When the file is larger, this has a strange behaviour: the program does not > throw an exception, java runtime does not throw an out-of-memory error, and > yet the file does not get written. I have increased java memory to -Xmx3072m > The same model can be successfully stored using SDB (>1.5 million triples), > so I guess the problem is not in the model. I guess it is a general Java > issue? > (http://www.java-forums.org/new-java/42031-writing-huge-sized-file-data-more-than-100mb-output-stream-converting-byte.html) > Did anyone else have this issue? Has anyone succeeded in writing rdf files > larger than 100mb to disk (and how)? Are you sure it is no just being very, very slow? http://jena.apache.org/documentation/io/rdf-output.html "N3" (better, "TTL") is trying to pretty print the data which requires analysing the data first. That can involve of small probes in the data which for a database is terrible for performance especially if done outside a transaction. You need to use a format that does less analysis e.g. RDFFormat.TURTLE_BLOCKS with RDFDataMgr. > Thank you in advance for your support. > Best regards,Nikolaos Konstantinou > > Is resultModel stored in SDB? Try the following: OutputStream out = new FileOutputStream RDFDataMgr.write(out, resultModel, RDFFormat.NTRIPLES) ; // Or lang.NTRIPLES which is the best scaling output. RDFFormat.TURTLE_BLOCKS isn't bad though. Andy
