Hi,
We have been performing some benchmarking experiments on the UOBM dataset
expanding on our previously published paper in ESWC 2010 (attached). The
response times of Oracle and Owlim is somewhat consistent, but we were
surprised that Jena TDB's (0.8.10) response time was extremely slow in
general and did not return any results (Java runs out of heap space) for
all the UOBM queries even while using the least expressive RDFS reasoning.
Can you shed light on the matter?
Here is how we load the dataset (TBox file(s) are loaded first):
jenaModel = TDBFactory.createModel(rootDirPath + repositryName);
InputStream in = FileManager.get().open(dataFile.getCanonicalPath());
...
jenaWatch.start();
jenaModel.read(in, baseURI,formatType);
jenaWatch.stop();
and here is how we fire the queries:
Model jenaModel = TDBFactory.createModel(rootDirPath + repoName);
InfModel jenaInfModel = ModelFactory.createRDFSModel(jenaModel);
...
jenaWatch.start();
iquery = QueryExecutionFactory.create(query,jenaInfModel);
ResultSet iresult = iquery.execSelect();
while(iresult.hasNext()) {
QuerySolution soln = iresult.nextSolution() ;
}
jenaWatch.stop();
We have also tried loading the TDB with the ABox only, then binding the
selected reasoner with the TBox schema (>> reasoner.bindSchema(schema)).
Attached: our ESWC paper, UOBM queries+TBox, Response times (TDB failed to
execute any of the queries).
Best regards
Taha
--
Dr Taha Osman
Computing and Informatics Building
School of Science and Technology
Nottingham Trent University
Clifton Campus
Nottingham NG11 8NS
Tel: +44 (0)115 848 8370
Fax: +44(0)115 848 8429
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