It is likely because the caching infrastructure needs to load the nodes once, and then can progressively optimize traversals after that.
A common practice to boost "first user" request performance is to "pre-cache" certain frequently accessed content by executing a dummy traversal/query when you start your application or web application. -----Original Message----- From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] On Behalf Of Darren Jensen Sent: Thursday, December 17, 2009 8:16 AM To: user@lists.neo4j.org Subject: [Neo] traverser speed on first execution Hi Neo4j users, My model is based on a typical Yellow Pages style business directory which basically consists of Categories (like "Hotels", "Restaurants", "Swimming Pools" etc) and Listings (e.g. "Marriott Hotel"). A listing can be placed under one or more Categories and a Category can contain one or more Listings. I have written a simple traverser that returns all the Listings in a Category. I am testing with a Category that contains 566 listing nodes. I am wondering why the first time the code executes, it is much slower than subsequent executes? Can you tell me a little bit more about what is happening under the hood please? Is the first execution slower becuase Neo4j has to setup the traverser or is it to setup the transaction? Are there any improvements that I can make to speed up the first execution? Here are the execution times (in order of execution): Duration: 661 ms Duration: 128 ms Duration: 82 ms Duration: 82 ms Duration: 121 ms Duration: 31 ms Duration: 25 ms Duration: 20 ms Duration: 12 ms Duration: 8 ms Duration: 7 ms Duration: 6 ms Duration: 4 ms This is the traverser code (which is executed in a transaction): Traverser listingInCategoryTraverser = categoryNode.traverse( Traverser.Order.BREADTH_FIRST, StopEvaluator.END_OF_GRAPH, ReturnableEvaluator.ALL_BUT_ START_NODE, RelTypes.CATEGORIZED_AS, Direction.INCOMING ); Many thanks for any comments and ideas! Darren _______________________________________________ Neo mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user _______________________________________________ Neo mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
