java -server is not the default on Macs. It makes a huge difference for Clojure.
% java -jar clojure.jar Clojure user=> (time (reduce #(+ %1 %2 (if (odd? %1) -1 0)) (range 10000000))) "Elapsed time: 11793.18 msecs" 49999990000001 % java -server -jar clojure.jar Clojure user=> (time (reduce #(+ %1 %2 (if (odd? %1) -1 0)) (range 10000000))) "Elapsed time: 6757.651 msecs" 49999990000001 The rough rule I've noticed is that the more complicated the Clojure code, the bigger the advantage -client has over -server. On Jan 27, 3:04 am, Keith Bennett <keithrbenn...@gmail.com> wrote: > All - > > I tried testing the code athttp://clojure.org/Refsto see what the > benefit of multicore processing would be. To my surprise, the my-pmap > function took *more* time, not less, than the map function. > > Whereas the times listed in the article were approximately 3.1 and 1.7 > seconds, on my MacBookPro 2.33 GHz Intel Core 2 Duo laptop, my times > were 14.9 and 15.1 seconds. > > What is the correct interpretation of these results? Does one need > more than 2 CPU's to see a benefit? Or is the Mac JVM only using one > CPU instead of two? Or...? > > ...and is there something wrong with my setup that both took so long? > > Thanks for any enlightenment. > > - Keith Bennett --~--~---------~--~----~------------~-------~--~----~ 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 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 -~----------~----~----~----~------~----~------~--~---
