Re: Amap vs Map performance
With 1.2: (set! *warn-on-reflection* true) (time (amap an-array idx ret (+ (int 1) (aget an-array idx Reflection warning, NO_SOURCE_PATH:52 - call to aclone can't be resolved. Reflection warning, NO_SOURCE_PATH:52 - call to alength can't be resolved. Reflection warning, NO_SOURCE_PATH:52 - call to aget can't be resolved. Reflection warning, NO_SOURCE_PATH:52 - call to aset can't be resolved. "Elapsed time: 2663.612 msecs" Type hinting the arrays: (time (amap ^ints an-array idx ret (+ (int 1) (aget ^ints an-array idx "Elapsed time: 11.443 msecs" Whenever you see unusually slow performance reflection is frequently the cause. Not sure about the 1.1/1.2 performance though. Harvey -- "You're keeping me alive because you don't know DOS?" Izzy, Prophecy II -- 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
Re: Extremely silly benchmarks, on types, records and maps.
It's slow because it has to use reflection to determine the type. Use (set! *warn-on-reflection* true) and you'll see the warning. Try something like this and you'll see significantly faster results: (let [#^testType t (new testType 1 2 3)] (time (dotimes [_ 1000] (.a t))) Harvey -- "You're keeping me alive because you don't know DOS?" Izzy, Prophecy II -- 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
Re: Missing fns: rotate & rotate-while
> (defn rotate [n s] > (let [[front back] (split-at (mod n (count s)) s)] > (concat back front))) Don't forget (mod n 0) is an ArithmeticException. Harvey -- 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
