Dave, do you have the test setup somewhere? It seems that you are using a shapefile import. In that case Neo4j Spatial is storing the polygons as Well Known Binaries and not really expanding them into a subgraph of POIs, so you are kind of "underutilizing" the capabilities :)
If you have the code, we can add it to Neo4j Spatial and then start improving the index. I would like to get Craig and Davide Savazzi into the picture who know a lot more about the implementation than I do, but the implementation is here: https://github.com/neo4j/neo4j-spatial/blob/master/src/main/java/org/neo4j/gis/spatial/RTreeIndex.java. For tuning, try to make sure to run the tests warm (that is, repeat every test a couple of times without closing the DB) and depending on the data, adjust the memory mappings for Neo4j. You can even warm up the OS file caches by doing dd nodestore.id >> /dev/null for all store files a couple of times (best to do a small shellscript for it) Craig is in China right now, will see if he can give more hints over the next few days. Thanks for looking into this! Cheers, /peter neubauer GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer http://www.neo4j.org - Your high performance graph database. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Fri, Jan 28, 2011 at 11:07 AM, Dave Hesketh <[email protected]> wrote: > Peter > I'm very happy to help optimizing the Rtree implementation (if I can). My > knowledge of Neo4j and Java is very limited. I am in the process of > scaling-up the data but I would still like some guidance on tuning Neo4j in > general. I will keep you informed of my results. > Dave > ps my last posted request to the forum looked a complete mess. I attached 5 > files which seem to be have been embedded in the text of the email. I am > going to try again with this email. > > _______________________________________________ > Neo4j mailing list > [email protected] > https://lists.neo4j.org/mailman/listinfo/user > > _______________________________________________ Neo4j mailing list [email protected] https://lists.neo4j.org/mailman/listinfo/user
