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3rd gen is the fastest of Rednaxela's trees. There's also a k-NN algorithm benchmark if you want to run some tests.

Voidious can you make a version of knn.jar with Julian Kent's tree and give instructions on how to use knn.jar on ubuntu 13.04

I've never used it, sorry.

Why not just pick Skilgannon's or Rednaxela's and go with it? The speed difference will be negligible. Unless you're locked into some insane batch job on a supercomputer upon choosing, I reckon you'll spend more time trying to evaluate them than you'll save by using one over the other.

what's the difference between drussgt 3.0.0's kd-tree and drussgt 3.0.1's kd-tree

No difference between them.

so what is the difference between drussgt 3.0.0 and drussgt 3.0.1

Try using this knn.jar, it has both trees as an option. Although that one isn't using my latest tree, you should be able to figure out how to change which tree it is using.

Seriously, the different in performance between RedGen3 and Skil are pretty negligible. You'd be better off putting the time into figuring out how to reduce a dimension of the data you're storing, or something like that, which will actually provide a speedup.

how do i change which tree its using

You'll need to extract the .jar file, and make a new wrapper class in net/robowiki/knn/implementations directory, similar to the other ones there. Then at the top of net/robowiki/knn/implementations/KNNBenchmark.java you'll need to add a reference to the tree you want to test, like the others are referenced.

how do i make a new knn.jar with the latest skilgannon kd-tree