Thanks for the test. I give a +1 fir this (with the already mentioned "but"'s like documentation etc.). Inclusion would also make it easier for others to test it a bit.
2010/9/21 Luc Maisonobe <luc.maison...@free.fr>: > Le 20/09/2010 15:28, Mikkel Meyer Andersen a écrit : > >> I would like to see/try a comparison between the default and new PRNG >> under different conditions. Just to get an idea of how they perform. > > I gave it a try. The version from yesterday was really slow (about 3 > times slower than other generators). It seems the JVM optimizer (at > least on my computer) was not able to inline everything. So I inlined > myself and also tried several different tricks to avoid modulo > operations in indices. I ended up with a solution different from the one > of the authors: I used precomputed indices arrays. This increase data > size by a factor 6 but really speeds up generation. > > Here are my results, using a 64 bits JVM on a linux computer with a 2 > years old processor (AMD phenom Quad 9550 at 2.2 GHz): > > generation rate for MersenneTwister: about 27 millions doubles per > second (remember I generate two 32 bits integers for each double). > > generation rates for other PRNG, relative to MersenneTwister: > > MersenneTwister 1.0 > JDKRandomGenerator 1.16 > Well512a 0.85 > Well1024a 0.63 > Well19937a 0.71 > Well19937c 0.57 > Well44497a 0.69 > Well44497b 0.65 > > > So JDK is 16% faster than MersenneTwister (but very poor) and the new > generators are between 15% slower and 43% slower. The order of magnitude > are the same. I could perhaps optimize a little further for example by > generating several numbers and caching them but am not sure this is > worth the effort. > > I have sent a mail to the paper authors with our questions. > > Luc > > --------------------------------------------------------------------- > To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org > For additional commands, e-mail: dev-h...@commons.apache.org > > --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org For additional commands, e-mail: dev-h...@commons.apache.org
