I'm using arq.2.8.8 in a Intel Core 2 Quad (2.33 Ghz) with 4.00 GB RAM in Windows 7 x 64.
I'm using Eclipse Indigo IDE. OntologyAcces.HOSTQUERY="http://127.0.0.1:3030/tdb/query"; is a constant that keeps the value of the URL of the Fuseki server. 2012/6/10 Andy Seaborne <[email protected]> > On 10/06/12 18:36, Federico López wrote: > >> I need to send a query to Fuseki server from Java ans ARQ is taking too >> much time parsing and executing a simple query to Fuseki Server. This is >> my >> code: >> >> long before=new java.util.Date().getTime(); >> Query query = >> QueryFactory.create(**OntologyAcces.PREFIXES+"SELECT *{?s ?p ?o} LIMIT >> 1000"); >> long after=new java.util.Date().getTime(); >> System.out.println("Parsing: "+(after-before)); >> > > If this is the first time the query is parsed, java classloading will > happen. > > I put that code (minus OntologyAcces.PREFIXES) in a loop executes 10 time > and got: > > Parsing: 28 > Parsing: 1 > Parsing: 0 > Parsing: 1 > Parsing: 0 > Parsing: 1 > Parsing: 0 > Parsing: 1 > Parsing: 0 > Parsing: 0 > > as you can see, the first time is expensive. > > Are you using a laptop? > > > > >> QueryExecution qexec = >> QueryExecutionFactory.**sparqlService(OntologyAcces.**HOST_QUERY, query); >> > > What's OntologyAcces.HOST_QUERY > > > >> ResultSet results = null; >> >> try{ >> long beforeE=new java.util.Date().getTime(); >> results = qexec.execSelect(); >> long afterE=new java.util.Date().getTime(); >> System.out.println("Execution: "+(afterE-beforeE)); >> >> // ResultSetFormatter.out(System.**out, results, query) ; >> for(;results.hasNext();){ >> QuerySolution qs = results.nextSolution(); >> //System.out.println("I'm the subject: >> "+qs.getResource("s")); >> >> } >> qexec.close(); >> } catch (Exception e) { >> e.printStackTrace(); } >> >> >> The parsing is taking up to 1000 ms and te execution is taking up to 200 >> ms. The triple store answer is not taking much time, the trouble I have is >> with ARQ specifically. >> > > 200ms to execute to a HTTP operation to a server without a pre-existing > connection is quite reasonable. There are lots of things that might be > being done. > > Andy > > -- *FEDERICO LÓPEZ GÓMEZ* Estudiante Ingeniería de Sistemas Universidad del Valle - Sede Tuluá
