Thanks Dave, Yes, I’m using TDB.
Using memory would be faster, I guess, but would the machine be able to handle millions of triples? Is Jena optimized for that? S. On 4/4/17, 12:34 AM, "Dave Reynolds" <[email protected]> wrote: The reasoners store all their information in memory. Your mention of transactions suggests that you are storing into a TDB or other database-backed store. That will not enable the reasoner to scale and will just slow things down. You'll get better performance by loading the data into memory and then applying the reasoner to that. You will, of course, need to allocate enough memory to this. What performance is like and how much memory is needed will depend on the details of your rules. After all the core RDFS is less than ten rules! Dave On 04/04/17 04:07, Dimov, Stefan wrote: > … and after an hour or so, eventually it failed with: > > Exception in thread "main" java.lang.OutOfMemoryError: Java heap space > at org.apache.jena.reasoner.rulesys.impl.BindingVectorMultiSet.getPartialEnv(BindingVectorMultiSet.java:119) > at org.apache.jena.reasoner.rulesys.impl.BindingVectorMultiSet.put(BindingVectorMultiSet.java:159) > at org.apache.jena.reasoner.rulesys.impl.BindingVectorMultiSet.add(BindingVectorMultiSet.java:91) > at org.apache.jena.reasoner.rulesys.impl.RETEQueue.fire(RETEQueue.java:105) > at org.apache.jena.reasoner.rulesys.impl.RETEClauseFilter.fire(RETEClauseFilter.java:227) > at org.apache.jena.reasoner.rulesys.impl.RETEEngine.inject(RETEEngine.java:492) > at org.apache.jena.reasoner.rulesys.impl.RETEEngine.runAll(RETEEngine.java:474) > at org.apache.jena.reasoner.rulesys.impl.RETEEngine.fastInit(RETEEngine.java:163) > at org.apache.jena.reasoner.rulesys.FBRuleInfGraph.prepare(FBRuleInfGraph.java:471) > at org.apache.jena.reasoner.BaseInfGraph.requirePrepared(BaseInfGraph.java:530) > at org.apache.jena.reasoner.rulesys.FBRuleInfGraph.findWithContinuation(FBRuleInfGraph.java:557) > at org.apache.jena.reasoner.rulesys.FBRuleInfGraph.graphBaseFind(FBRuleInfGraph.java:587) > at org.apache.jena.reasoner.BaseInfGraph.graphBaseFind(BaseInfGraph.java:359) > at org.apache.jena.graph.impl.GraphBase.find(GraphBase.java:241) > at org.apache.jena.graph.GraphUtil.findAll(GraphUtil.java:99) > at org.apache.jena.graph.GraphUtil.addInto(GraphUtil.java:151) > at org.apache.jena.rdf.model.impl.ModelCom.add(ModelCom.java:225) > > S. > > From: Stefan Dimov <[email protected]> > Date: Monday, April 3, 2017 at 4:37 PM > To: "[email protected]" <[email protected]> > Subject: Long time to load the reasoner ... > > Hi all, > > I’m loading my Jena with a few million triples in chunks (every chunk in a separate transaction). It takes a few minutes. > > Then I’m loading the reasoner (in a separate transaction), which contains less than ten rules and it takes a loooong time. > > Why is this? Am I doing something wrong or that’s to be expected? Should I change some settings? Increase the memory? > > S. >
