Ubuntu 12.04, java 6 32 bits.... Luc P.
> This is weird...for just 2 operations I'm getting consistently better > timings with persistent than transients... > > user=> (time (dotimes [_ 1000000] (assoc [1 2 3 4 5 6 7 8 9 0] 3 5 6 8))) > "Elapsed time: 240.247405 msecs" > nil > user=> > user=> (time (dotimes [_ 1000000] (persistent! (assoc! (transient [1 2 3 > 4 5 6 7 8 9 0]) 3 5 6 8)))) > "Elapsed time: 354.122806 msecs" > nil > user=> (time (dotimes [_ 1000000] (assoc [1 2 3 4 5 6 7 8 9 0] 3 5 6 8))) > "Elapsed time: 188.765493 msecs" > nil > user=> (time (dotimes [_ 1000000] (persistent! (assoc! (transient [1 2 3 > 4 5 6 7 8 9 0]) 3 5 6 8)))) > "Elapsed time: 318.90242 msecs" > nil > > Jim > > ps: are you guys on java 1.7 ? > > On 09/11/12 02:29, Softaddicts wrote: > > Roughly... My FPU module is slow tonight.... > > > > > >> My own tests shows that the transient version is twice as fast: > >> > >> (time (dotimes [_ 1000000] (assoc [1 2 3 4 5 6 7 8 9 0] 3 5 6 8))) > >> Elapsed time: 711.848312 msecs > >> > >> (time (dotimes [_ 1000000] (persistent! (assoc! (transient [1 2 3 4 5 6 7 > >> 8 9 0]) 3 5 6 8)))) > >> Elapsed time: 399.466556 msecs > >> > >> Luc P. > >> > >>> user=> (use '[criterium.core]) > >>> nil > >>> user=> (bench (assoc [1 2 3 4 5 6 7 8 9 0] 3 nil 6 'a)) ;;2 operations > >>> > >>> Evaluation count : 125829120 in 60 samples of 2097152 calls. > >>> Execution time mean : 488.826554 ns > >>> Execution time std-deviation : 19.952095 ns > >>> Execution time lower quantile : 459.910320 ns ( 2.5%) > >>> Execution time upper quantile : 527.008269 ns (97.5%) > >>> nil > >>> user=> (bench (persistent! (assoc! (transient [1 2 3 4 5 6 7 8 9 0]) 3 > >>> nil 6 'a))) > >>> Evaluation count : 97399860 in 60 samples of 1623331 calls. > >>> Execution time mean : 639.789263 ns > >>> Execution time std-deviation : 26.265080 ns > >>> Execution time lower quantile : 597.753127 ns ( 2.5%) > >>> Execution time upper quantile : 687.838668 ns (97.5%) > >>> nil > >>> user=> (bench (assoc [1 2 3 4 5 6 7 8 9 0] 3 nil 6 'a 0 "z" 2 5)) ;;4 > >>> operations > >>> Evaluation count : 68275920 in 60 samples of 1137932 calls. > >>> Execution time mean : 901.407416 ns > >>> Execution time std-deviation : 35.682637 ns > >>> Execution time lower quantile : 851.060950 ns ( 2.5%) > >>> Execution time upper quantile : 970.492949 ns (97.5%) > >>> > >>> Found 1 outliers in 60 samples (1.6667 %) > >>> low-severe 1 (1.6667 %) > >>> Variance from outliers : 25.4849 % Variance is moderately inflated by > >>> outliers > >>> nil > >>> user=> (bench (persistent! (assoc! (transient [1 2 3 4 5 6 7 8 9 0]) 3 > >>> nil 6 'a 0 "z" 2 5))) > >>> Evaluation count : 68844120 in 60 samples of 1147402 calls. > >>> Execution time mean : 893.798444 ns > >>> Execution time std-deviation : 24.566655 ns > >>> Execution time lower quantile : 848.307600 ns ( 2.5%) > >>> Execution time upper quantile : 952.841308 ns (97.5%) > >>> > >>> Found 13 outliers in 60 samples (21.6667 %) > >>> low-severe 7 (11.6667 %) > >>> low-mild 6 (10.0000 %) > >>> Variance from outliers : 14.2244 % Variance is moderately inflated by > >>> outliers > >>> nil > >>> user=> (bench (assoc [1 2 3 4 5 6 7 8 9 0] 3 nil 6 'a 0 "z" 2 5 4 (atom > >>> []) 7 "v")) ;;6 operations > >>> Evaluation count : 39783840 in 60 samples of 663064 calls. > >>> Execution time mean : 1.480511 us > >>> Execution time std-deviation : 50.249443 ns > >>> Execution time lower quantile : 1.425053 us ( 2.5%) > >>> Execution time upper quantile : 1.591407 us (97.5%) > >>> nil > >>> user=> (bench (persistent! (assoc! (transient [1 2 3 4 5 6 7 8 9 0]) 3 > >>> nil 6 'a 0 "z" 2 5 4 (atom []) 7 "v"))) > >>> Evaluation count : 44755020 in 60 samples of 745917 calls. > >>> Execution time mean : 1.358394 us > >>> Execution time std-deviation : 49.723547 ns > >>> Execution time lower quantile : 1.306456 us ( 2.5%) > >>> Execution time upper quantile : 1.473882 us (97.5%) > >>> nil > >>> > >>> user=> (bench (assoc [1 2 3 4 5 6 7 8 9 0] 3 nil 6 'a 0 "z" 2 5 4 (atom > >>> []) 7 "v" 5 1200 8 -1111)) ;;8 operations > >>> Evaluation count : 31457280 in 60 samples of 524288 calls. > >>> Execution time mean : 1.907389 us > >>> Execution time std-deviation : 74.523511 ns > >>> Execution time lower quantile : 1.822336 us ( 2.5%) > >>> Execution time upper quantile : 2.076044 us (97.5%) > >>> nil > >>> user=> (bench (persistent! (assoc! (transient [1 2 3 4 5 6 7 8 9 0]) 3 > >>> nil 6 'a 0 "z" 2 5 4 (atom []) 7 "v" 5 1200 8 -1111))) > >>> Evaluation count : 37739640 in 60 samples of 628994 calls. > >>> Execution time mean : 1.623599 us > >>> Execution time std-deviation : 68.677518 ns > >>> Execution time lower quantile : 1.529454 us ( 2.5%) > >>> Execution time upper quantile : 1.777040 us (97.5%) > >>> > >>> Found 1 outliers in 60 samples (1.6667 %) > >>> low-severe 1 (1.6667 %) > >>> Variance from outliers : 28.6901 % Variance is moderately inflated by > >>> outliers > >>> nil > >>> > >>> > >>> etc etc... > >>> > >>> you get the idea...conclusion: there is no real benefit to using > >>> transients for less than 6 operations... > >>> > >>> Jim > >>> > >>> > >>> > >>> > >>> On 08/11/12 23:04, Philip Potter wrote: > >>>> Share the benchmark! > >>>> > >>>> In theory, conversion to and from transients should be constant time > >>>> operations, but it would not surprise me if in practice transients > >>>> aren't universally faster than persistent. > >>>> > >>>> Performance in different environments varies wildly, so I would doubt > >>>> results from a small benchmark on a single machine are universally > >>>> applicable. > >>>> > >>>> Benchmarking is hard, particularly on the jvm. Caching and dynamic > >>>> inlining and Hotspot confuse matters greatly. > >>>> > >>>> Phil > >>>> > >>>> On Nov 8, 2012 10:49 PM, "Jim - FooBar();" <jimpil1...@gmail.com > >>>> <mailto:jimpil1...@gmail.com>> wrote: > >>>> > >>>> Some quick benchmarking that I did, showed that it is actually > >>>> more expensive to convert to transient, conj/assoc and convert > >>>> back to persistent than the regular conj/assoc unless you want to > >>>> do more than 8 operations at a time (preferably more than that). > >>>> My experiments were on vectors and the vararg version of > >>>> assoc/assoc!. > >>>> > >>>> any thoughts? would you agree? > >>>> > >>>> Jim > >>>> > >>>> -- > >>>> 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 > >>>> <mailto: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 > >>>> <mailto:clojure%2bunsubscr...@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 > >>> -- > >>> 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 > >> -- > >> Softaddicts<lprefonta...@softaddicts.ca> sent by ibisMail from my ipad! > >> > >> -- > >> 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 > >> > > -- > > Softaddicts<lprefonta...@softaddicts.ca> sent by ibisMail from my ipad! > > > > -- > 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 > -- Softaddicts<lprefonta...@softaddicts.ca> sent by ibisMail from my ipad! -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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