Cache effects on benchmark
Ahh nice. Out of curiosity, any reason you're comparing against my 2nd gen tree? My 3rd gen tree was a bit faster at least in the tests I did.
I don't have it installed yet, and I thought I'll do a proper bench when I add my tree to the whole bench framework. Do you still have the code that does those nice charts tracking the trees through time? Is that what's in the KNN.jar? Yes it is! Great.
Ah, looks like KNN.jar that's uploaded on the wiki isn't quite 100% up-to-date. A couple days after the KNN.jar uploaded to the wiki was last updated I made a few minor changes. See here for the latest source [1]
You got that just in time, your latest code is now in!
So on the vanilla Diamond-gun data benchmark it seems to be pretty much tied with your Gen2 and Gen3, changing places from run to run. This is what I saw mostly though, your Gen2 slightly above Gen3, and my cache-hit tree in the middle:
BEST RESULT: - #1 Rednaxela's kd-tree (2nd gen) [0.0317] - #2 Skilgannon's Cache-hit KDTree [0.0340] - #3 Rednaxela's kd-tree (3rd gen) [0.0356] - #4 Voidious' Linear search [0.4175]
So, I wrote some code which instantiates, does operations on, then destroys an array of 1k doubles and 1k ints, and makes it a dependency of a later println. This was the result:
RESULT << k-nearest neighbours search with Voidious' Linear search >> : Average searching time = 0.4198 miliseconds : Average worst searching time = 14.7468 miliseconds : Average adding time = 1.6292 microseconds : Accuracy = 100.0% RESULT << k-nearest neighbours search with Rednaxela's kd-tree (2nd gen) >> : Average searching time = 0.0333 miliseconds : Average worst searching time = 1.7135 miliseconds : Average adding time = 1.7662 microseconds : Accuracy = 100.0% RESULT << k-nearest neighbours search with Skilgannon's Cache-hit KDTree >> : Average searching time = 0.0312 miliseconds : Average worst searching time = 1.3695 miliseconds : Average adding time = 2.7642 microseconds : Accuracy = 100.0% RESULT << k-nearest neighbours search with Rednaxela's kd-tree (3rd gen) >> : Average searching time = 0.0317 miliseconds : Average worst searching time = 1.2998 miliseconds : Average adding time = 2.1558 microseconds : Accuracy = 100.0% BEST RESULT: - #1 Skilgannon's Cache-hit KDTree [0.0312] - #2 Rednaxela's kd-tree (3rd gen) [0.0317] - #3 Rednaxela's kd-tree (2nd gen) [0.0333] - #4 Voidious' Linear search [0.4198]
It now comes first every single time I run. So it seems my cache-hit design has paid off (slightly) =)
