Hello, We have a production server encountering significant slowness resulting from high CPU usage since about two weeks now.
When we ckeck high CPU usage threads dumps we note that calls to Jena are always implicated. The calling code in our application executes a SPARQL query and iterates on query solution. The Jena version used is 2.10.1 (with jena-tdb 0.10.1) There was recently no change made in our application source code that could explain this issue. Have you any idea about possible causes ? Thank you in advance for your support. Sincerely, Laurent. Here is a thread dump as an example: "RMI TCP Connection(17383)-10.249.203.163" daemon prio=6 tid=0x0000000015607800 nid=0x1dd0 waiting for monitor entry [0x000000001518d000] java.lang.Thread.State: BLOCKED (on object monitor) at com.hp.hpl.jena.tdb.base.block.BlockMgrSync.release(BlockMgrSync.java:76) - waiting to lock <0x000000072ab58058> (a com.hp.hpl.jena.tdb.base.block.BlockMgrCache) at com.hp.hpl.jena.tdb.transaction.BlockMgrJournal.release(BlockMgrJournal.java:207) at com.hp.hpl.jena.tdb.transaction.BlockMgrJournal.release(BlockMgrJournal.java:207) at com.hp.hpl.jena.tdb.transaction.BlockMgrJournal.release(BlockMgrJournal.java:207) at com.hp.hpl.jena.tdb.transaction.BlockMgrJournal.release(BlockMgrJournal.java:207) at com.hp.hpl.jena.tdb.transaction.BlockMgrJournal.release(BlockMgrJournal.java:207) at com.hp.hpl.jena.tdb.transaction.BlockMgrJournal.release(BlockMgrJournal.java:207) at com.hp.hpl.jena.tdb.base.block.BlockMgrWrapper.release(BlockMgrWrapper.java:77) at com.hp.hpl.jena.tdb.base.page.PageBlockMgr.release(PageBlockMgr.java:92) at com.hp.hpl.jena.tdb.base.recordbuffer.RecordRangeIterator.close(RecordRangeIterator.java:151) at com.hp.hpl.jena.tdb.base.recordbuffer.RecordRangeIterator.hasNext(RecordRangeIterator.java:134) at org.apache.jena.atlas.iterator.Iter$4.hasNext(Iter.java:293) at com.hp.hpl.jena.tdb.sys.DatasetControlMRSW$IteratorCheckNotConcurrent.hasNext(DatasetControlMRSW.java:119) at org.apache.jena.atlas.iterator.Iter$4.hasNext(Iter.java:293) at org.apache.jena.atlas.iterator.Iter$3.hasNext(Iter.java:179) at org.apache.jena.atlas.iterator.Iter.hasNext(Iter.java:906) at org.apache.jena.atlas.iterator.RepeatApplyIterator.hasNext(RepeatApplyIterator.java:58) at com.hp.hpl.jena.tdb.solver.SolverLib$IterAbortable.hasNext(SolverLib.java:193) at org.apache.jena.atlas.iterator.RepeatApplyIterator.hasNext(RepeatApplyIterator.java:46) at com.hp.hpl.jena.tdb.solver.SolverLib$IterAbortable.hasNext(SolverLib.java:193) at org.apache.jena.atlas.iterator.Iter$4.hasNext(Iter.java:293) at com.hp.hpl.jena.sparql.engine.iterator.QueryIterPlainWrapper.hasNextBinding(QueryIterPlainWrapper.java:54) at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:112) at com.hp.hpl.jena.sparql.engine.iterator.QueryIterConvert.hasNextBinding(QueryIterConvert.java:59) at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:112) at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorWrapper.hasNextBinding(QueryIteratorWrapper.java:40) at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:112) at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorWrapper.hasNextBinding(QueryIteratorWrapper.java:40) at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:112) at com.hp.hpl.jena.sparql.engine.ResultSetStream.hasNext(ResultSetStream.java:75) at com.telemis.core.measure.server.rdf.MeasureRetrieveRdf.getMeasuresFromSeriesIds(MeasureRetrieveRdf.java:138) at com.telemis.core.measure.server.rdf.MeasureRetrieveRdf.getMeasuresFromSeries(MeasureRetrieveRdf.java:183) at telemis.measure.tms.service.MeasureService.getMeasuresFromSeries(MeasureService.java:458) at telemis.measure.tms.service.MeasureService.getMeasuresFromExam(MeasureService.java:436) at telemis.measure.tms.messagehandlers.GetMeasuresFromExamMessageHandler.perform(GetMeasuresFromExamMessageHandler.java:46) at telemis.measure.tms.messagehandlers.GetMeasuresFromExamMessageHandler.perform(GetMeasuresFromExamMessageHandler.java:26) at telemis.service.MessageHandlerManager.execute(MessageHandlerManager.java:50) at telemis.service.MomoRMIImpl.executeInternal(MomoRMIImpl.java:522) at telemis.service.MomoRMIImpl.execute(MomoRMIImpl.java:367) at telemis.service.MomoRMIImpl_Skel.dispatch(Unknown Source) at sun.rmi.server.UnicastServerRef.oldDispatch(Unknown Source) at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source) at sun.rmi.transport.Transport$1.run(Unknown Source) at sun.rmi.transport.Transport$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Unknown Source) at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Locked ownable synchronizers: - <0x0000000737fcdfe8> (a java.util.concurrent.ThreadPoolExecutor$Worker)
