I suggest examining the examples in test.benchmark to see how Java numeric performance can be attained, http://github.com/clojure/test.benchmark
On Monday, March 26, 2012, Sergey Didenko <sergey.dide...@gmail.com> wrote: > Hi, > > I believe I've heard claims that nothing stops Clojure 1.3 code to be > made very close to Java in terms of execution speed. > > However when trying to match the speed of ad-hoc Heapsort > implementation I have faced essential obstacles. > > Setting type hints and coercions was quite easy. A bit harder was to > realize that "aset" is much faster than "aset-int" and that "(int -1)" > inside "if" condition can be faster than "-1". > > However I'm still far from the Java speed ( 1.5 times slower on a cut > code - first part of the Heapsort ). > > What I can't understand now is why inlining the following function > makes a noticeable speedup (~20%). Isn't it supposed to be solved in > 1.3? > > (defn move-up! [^long pos] > (let [array (ints array)] > (loop [pos pos ppos (unchecked-divide-int pos 2)] > (if (or (= pos 0) > (>= (aget array ppos) (aget array pos))) > nil > (do ;(swap! array ppos pos) > (recur ppos (unchecked-divide-int ppos 2))))))) > > I'm attaching the full sources if anyone is interested to measure the > difference. > > Regards, Sergey. > > P.S. > > java version "1.7.0_02" > Java(TM) SE Runtime Environment (build 1.7.0_02-b13) > Java HotSpot(TM) 64-Bit Server VM (build 22.0-b10, mixed mode) > > -- > 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 -- 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
