What JVM 6 sub-version are you using? Does it make any difference if you specify -XX:+DoEscapeAnalysis at the command line? Various JVM 6 sub-versions enable and disable it by default and it can make a pretty hefty difference if it isn't enabled.
-- Aaron On Sun, Jan 3, 2010 at 4:00 PM, Gabi <bugspy...@gmail.com> wrote: > I've double checked on my machine (Vista. JVM 6. Clojure 1.1.0). > Clojure's sort is is 4 to 5 times slower than sorted-vec2 > Maybe somebody with a Vista machine double check this? > > > On Jan 3, 5:51 pm, ianp <ian.phill...@gmail.com> wrote: >> > More findings: The reason that the Clojure's original sort is 8 times >> > slower >> >> I don’t see that on my machine. I’m running 1.1.0-master-SNAPSHOT with >> Apple’s Java 6 VM in case that has anything to do with it, but here's >> what I get (after running the tests several times to warm up hotspot): >> >> user=> (def v (vec (take 10000 (repeatedly #(rand-int 100000))))) >> >> user=> (time (dotimes [_ 1000] (sort v))) >> "Elapsed time: 4376.471 msecs" >> >> user=> (defn sorted-vec [coll] >> (let [a (into-array coll)] >> (java.util.Arrays/sort a) >> (vec a))) >> user=> (time (dotimes [_ 1000] (sorted-vec v))) >> "Elapsed time: 3254.371 msecs" >> >> user=> (defn sorted-vec-2 [coll] >> (let [a (to-array coll)] >> (java.util.Arrays/sort a) >> (vec a))) >> user=> (time (dotimes [_ 1000] (sorted-vec-2 v))) >> "Elapsed time: 2599.63 msecs" >> >> So sorted-vec is faster, but not an order of magnitude, and sorted- >> vec-2 is faster again. >> >> Another alternative that may be worth considering is leaving the data >> in the array and using aget to access elements (this should give you O >> (1) access times vs. O(log32N) AFAIK). This may be a solution if >> you're not mutating the data in the array, but I'd be careful about >> this optimisation unless it really gets a large speed boost for your >> code. > > -- > 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
