Hi, What is the error/problem you get when executing the program?
It is not a good idea to use all available RAM for the Java heap. Have a look at http://wiki.neo4j.org/content/Configuration_Settings for more information on how to configure Neo4j to make good use of available RAM. Regards, -Johan On Tue, Feb 23, 2010 at 6:11 PM, Miguel Angel Aguila <[email protected]> wrote: > Yes I give 64 GB and only 60 GB in diferent executions. > > 2010/2/23 Mattias Persson <[email protected]> > >> 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
