On Wed, Jun 30, 2010 at 10:19 AM, j-g-faustus <johannes.fries...@gmail.com>wrote:
> Tried the equiv branch briefly: The "1.1 style" version is ~4% > quicker, but still ~4x slower than Java and ~2x slower than mutable > deftype. > > But I found another issue: Array access apparently converts primitives > to boxed values at every access. This is perhaps because aget/aset is > a function and primitives cannot cross function boundaries? > That would explain the relative slowness of arrays. > > Here is a test case http://gist.github.com/458669 > And a profiler screenshot > http://i589.photobucket.com/albums/ss334/j-g-faustus/profiling/array-test-50k.png > > 15% CPU time goes to Double.valueOf(double) in all-primitive array > access and another ~4% to intCast(int). > > The number of calls to Double.valueOf(double) seems to suggest that it > is called only on aset, not on aget, though I can't think of any > reason how that could be. > > Does anyone know more about this? > > > Regards > jf On the equiv branch I don't see this at all. Also on the equiv branch most of your type hints inside the fn are unnecessary. (defn ^:static test-double ^doubles [^long n] (let [len 5 arr (double-array 5) n n] (dotimes [_ n] (dotimes [i len] (dotimes [j (inc i)] (aset arr j (+ 1.0 (- (aget arr i) (aget arr j))))))) arr)) David > -- 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
