Some more data points on 1.3 alpha 1 performance: bit operations appear to be much faster on hinted args. For example,
(defn unhinted-shift [n] (bit-shift-left n 1)) (defn ^:static hinted-shift [^long n] (bit-shift-left n 1)) user=> (time (doseq [x (range 100000)] (unhinted-shift x))) "Elapsed time: 2533.935459 msecs" user=> (time (doseq [x (range 100000)] (hinted-shift x))) "Elapsed time: 33.889503 msecs" On the other hand, / seems to be much faster on unhinted args. (defn unhinted-divide [n] (/ n 2)) (defn ^:static hinted-divide [^long n] (/ n 2)) user=> (time (doseq [x (range 100000)] (unhinted-divide x))) "Elapsed time: 37.612043 msecs" user=> (time (doseq [x (range 100000)] (hinted-divide x))) "Elapsed time: 2687.836862 msecs" I checked the enhanced operations (+, -, *, inc, dec) and their prime counterparts (+', -', *', inc', dec'). All 10 perform equally fast with unhinted and hinted args. On Sep 30, 12:19 am, Mark Engelberg <mark.engelb...@gmail.com> wrote: > bitwise-and and bitwise-shift-right and bitwise-shift-left run more > than 50 times slower in clojure 1.3 alpha 1 versus clojure 1.2. Could > the 1.3 gurus please investigate this? > > Try something like this to see the difference: > (time (doseq [x (range 100000)] (bit-shift-left x 1))) > > This points to another issue with Clojure 1.3. I can't figure out how > to determine what is a primitive and what isn't. Are the values > produced by range primitives? Are the values produced by bitwise > operations primitive? How can I determine this? -- 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
