One more thing... how much heap have you given the JVM? You control how much RAM your JVM gets with the -Xmx option to the java command. F.ex:
java -Xmx10G -cp ..... Please see more information regarding performance and tweaking at http://wiki.neo4j.org/content/Neo4j_Performance_Guide 2010/2/23 Mattias Persson <[email protected]>: > I see that you're using an older version of Neo4j. Have you tried using 1.0? > > http://components.neo4j.org/neo4j-kernel > http://neo4j.org/download > > Maven > groupId: org.neo4j > artifactId: neo4j-kernel > version: 1.0 > > ...and at first glance I don't see any direct problem with your code. > > 2010/2/23 Miguel Ángel Águila <[email protected]>: >> Hello, >> >> I'm doing a code to walk around all the nodes and get the node with the >> maximum out degree. The main problem is that there are around 57 million >> of nodes and 322 million of edges in the neo database, and using a 64 GB >> RAM is insufficient to execute the program. It is the code: >> Can anyone see what I'm doing wrong? I don't understand. >> >> Thanks. >> Mike >> >> >> >> public static void getNodeMaxOutDegreeNeo(final NeoService neo, >> final IndexService indexService) { >> Node idNode; >> long degree; >> long maxDegree = 0; >> IndexHits<Node> nodes; >> long idDegree; >> long idMaxDegree; >> Transaction tx = neo.beginTx(); >> try { >> nodes = indexService.getNodes("TYPE", "titles"); >> Iterator<Node> it = nodes.iterator(); >> Node idNodeMaxDegree=it.next(); >> Iterator<Relationship> relIterator = >> idNodeMaxDegree.getRelationships( >> NeoDataBase.MyRelationshipTypes.REF, >> Direction.OUTGOING).iterator(); >> >> while (relIterator.hasNext()) { >> relIterator.next(); >> maxDegree++; >> } >> long counter = 0; >> while (it.hasNext()) { >> if ( ++counter % 50000 == 0 ) { >> tx.success(); >> tx.finish(); >> tx = neo.beginTx(); >> } >> idNode = it.next(); >> relIterator = >> idNode.getRelationships(NeoDataBase.MyRelationshipTypes.REF, >> Direction.OUTGOING).iterator(); >> degree = 0; >> while (relIterator.hasNext()) { >> relIterator.next(); >> degree++; >> } >> if (degree >= maxDegree) { >> if(degree==maxDegree) { >> idDegree= >> Long.getLong((String)idNode.getProperty("ID_TITLE")); >> idMaxDegree= >> Long.getLong((String)idNodeMaxDegree.getProperty("ID_TITLE")); >> if(idDegree>idMaxDegree) { >> idNodeMaxDegree = idNode; >> } >> } >> else { >> maxDegree = degree; >> idNodeMaxDegree = idNode; >> } >> } >> } >> >> System.out.println("OId = >> "+(String)idNodeMaxDegree.getProperty("ID_TITLE")); >> System.out.println("Title = >> "+(String)idNodeMaxDegree.getProperty("NAME")); >> System.out.println("#refs = "+maxDegree); >> tx.success(); >> } >> finally >> { >> tx.finish(); >> } >> } >> >> _______________________________________________ >> Neo mailing list >> [email protected] >> https://lists.neo4j.org/mailman/listinfo/user >> > > > > -- > Mattias Persson, [[email protected]] > Neo Technology, www.neotechnology.com > -- Mattias Persson, [[email protected]] Neo Technology, www.neotechnology.com _______________________________________________ Neo mailing list [email protected] https://lists.neo4j.org/mailman/listinfo/user
