High Cost of first query using OrientGraphFactory

[du00cs]

Hi, I notice that there are high cost of first query using OrientGraphFactory.

OrientGraph g = factory.getNoTx();
List<Object> list = g.traversal().V()...toList();
g.close();

First query will exceed 100ms in my test,
getNoTx cost 517ms
g.traversal().V()...toList() cost 266ms.

How can I improve the performance?

[Usnul]

likely class loader is to blame. Java will only load classes when they are being used, meaning when you instantiate an object with large class hierarchy behind it - it will take a lot of time. Try:

OrientGraph g0 = factory.getNoTx(); //force class loader
OrientGraph g = factory.getNoTx(); //<- measure this
List<Object> list = g.traversal().V()...toList();
g.close();