On Tue, Aug 18, 2009 at 11:28 AM, Brad Beveridge<brad.beveri...@gmail.com> wrote: > > On 2009-08-17, at 8:58 PM, FFT <fft1...@gmail.com> wrote: > >> On Mon, Aug 17, 2009 at 9:25 AM, Bradbev<brad.beveri...@gmail.com> >> wrote: >>> >>> Ah, that makes more sense re the "cheating" then. Your insight for >>> array range check elimination got me thinking - why can't the >>> accessor >>> macros (posx, etc) that use aset/aget have their ranges eliminated by >>> the JVM? After all, it should be a simple constant fold. I found >>> another 2-3x speed up by coercing the indexes with (int x), ie >>> (defmacro mass [p] `(double (aget ~p (int 0)))) >> >> I'm not seeing this. Maybe you are running this on "-client"? > I'm running Java 1.5 32bit on OS X 10.5 with -server. >> >>> I don't have the Java version running on my machine, but I saw >>> runtimes go from 833ms to 295ms for 100000 iterations, a 2.8x speed >>> up, which should put the "no cheating" version on the same standing >>> as >>> the Java implementation. >> >> You can't get a consistent timing for anything less than 1-10M >> iterations here. > Why do you think that? Everything I've read says that hotspot kicks > in at 10,000, and I always do a warmup run. > I see consistent enough timings, within 50ms each run. When coerced > ints gives an immediate 3x speedup something is happening. What JVM > are you running & what settings? I'll compile the java version soon > so I can do a direct compare on a single machine. I take it that your > setup is showing clojure 3x slower than the java version? > > Brad >
I don't see much of any difference here from those coercions either. What clojure version are you using? -- Aaron --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
