Thx, that was it :)
I used the boxed int version ^Integer as a type hint, so it had not the expected effect. I also only "type hinted" the input function parameter not the return value. Greeting Daniel Gerlach On Sunday, August 13, 2017 at 2:28:13 PM UTC+2, James Reeves wrote: > > With type hints your implementation should run faster: > > (defn fib ^long [^long n] > (if (< n 2) > n > (+ (fib (- n 2)) (fib (- n 1))))) > > What does your Java code look like? Is it also recursive? > > > On 13 August 2017 at 10:54, Daniel Gerlach <daniel.ge...@gmail.com > <javascript:>> wrote: > >> Hey, >> >> out of curiosity i did some benchmarking on my Macbook Pro 13 i5 2,7 GHz. >> >> I chose a simple naive fibonacci implementation as a candidate >> (i know that is not a good comparison value for real-world cases) >> >> The implementation looks like this: >> >> (defn fib [n] >> (if (< n 2) >> n >> (+ (fib (- n 2)) (fib (- n 1))))) >> >> >> >> The results are a little bit surprising. >> >> The average time for fib(32) in Clojure was ~ 500ms >> The same algorithm in Java takes ~ 15 ms to finish. >> That means Clojure it's ~30x slower than Java for this special case. >> >> I also "warmed up" the JVM in both cases. For Clojure i used "criterium". >> >> >> Can somebody explain? Do i do something wrong? Are there any optimization >> <http://www.dict.cc/englisch-deutsch/optimization.html>s possible, e.g. >> type hints etc. ? >> Does Clojure has problems with recursive functions? >> >> >> Greetings >> >> Daniel Gerlach >> >> -- >> You received this message because you are subscribed to the Google >> Groups "Clojure" group. >> To post to this group, send email to clo...@googlegroups.com >> <javascript:> >> Note that posts from new members are moderated - please be patient with >> your first post. >> To unsubscribe from this group, send email to >> clojure+u...@googlegroups.com <javascript:> >> 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 unsubscribe from this group and stop receiving emails from it, send an >> email to clojure+u...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > > > -- > James Reeves > booleanknot.com > -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
