If you change the size of your CA, is the ( java time / clojure time ratio ) roughly constant ?
2010/5/28 Rubén Béjar <rbe...@unizar.es> > Hi all, > > I am new to the list and to Clojure. I have been working in > implementing some 2D cellular automata (CA) just to have a project > to teach Clojure to myself. After some work I have something that > works, but it is pretty slow. The function that takes a CA > of 500x500 cells (integers) and returns an updated (*) copy > takes 4 s. (using Clojure vectors), while doing more or less the same in > Java (using arrays and primitive types) takes more or > less 16 *ms.*. I expected some difference, but not that big. Before > trying to use Java arrays and primitive types > in Clojure, I would like to know how my Clojure approach can > be improved (I am willing to sacrifice some performance to keep > it "more Clojure", but not that much). > > As I do not want to post a bunch of horrible code full of comments > and not properly indented, I have extracted what i hope are the > main pieces, written some comments and posted it here: > http://snipt.org/Okpk > > Pasting that code in a new file in Eclipse (I am using > counterclockwise) and running it in the REPL prints this: > > Clojure 1.1.0-alpha-SNAPSHOT > "Elapsed time: 4355.363706 msecs" > "Elapsed time: 4416.98562 msecs" > 1:1 user=> #<Namespace cellular-automata-basic> > 1:2 cellular-automata-basic=> > > I would thank a lot any hint, suggestion, comment, or > whatever... :-) > > Best regards, > > Rubén > > (*) The update consists on adding the values of the 8 neighbours > of every cell and changing it if that sum is between two fixed > numbers. > > -- > Rubén BÉJAR HERNÁNDEZ > > Dpto. de Informática e Ingeniería de Sistemas - Universidad de Zaragoza > (Computing and Systems Engineering Department - Universidad de Zaragoza) > c/ María de Luna 1, 50018 Zaragoza, Spain > > Tel: (+34) 976 76 2332 (Fax: 1914) e-mail: rbe...@unizar.es > > Grupo IA3 (IA3 Laboratory) - http://iaaa.cps.unizar.es > > > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com<clojure%2bunsubscr...@googlegroups.com> > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
