Did I see a thread a while ago where doing this caught some people out because it wiped out some other performance switches? I can't find the thread.
Apologies if I am spreading FUD.... On Wednesday, 5 February 2014 23:05:18 UTC, Alex Miller wrote: > > To override the default tiered compilation, add this to your project.clj: > > :jvm-opts ^:replace [] > > I would also recommend using a newer JDK (preferably 7, but at least 6). > > > On Wednesday, February 5, 2014 4:34:12 PM UTC-6, David Nolen wrote: >> >> You need to make sure that you are running with server settings. If you >> are using lein, it's likely that this is not the case unless you have >> overridden lein's defaults in your project.clj. >> >> >> On Wed, Feb 5, 2014 at 5:30 PM, Glen Fraser <hola...@gmail.com> wrote: >> >>> Thanks, yes, the version starting with 0.0 in the loop (rather than 0) >>> does run faster. In my case, about 13% faster (19.7 seconds -- for the >>> code you pasted below, with *unchecked-math*, type hints and starting x of >>> 0.0 -- vs 22.7 seconds for my original version). But if you start with x >>> of 0 (integer), the type-hinted version runs notably slower. In all cases, >>> though, at least you get the same final answer… (-; >>> >>> So I don't see that 50% speedup you're seeing, but I do see improvement. >>> I'm on Clojure 1.5.1, and Java 1.7.0_51 on OS X 10.8.5, running in an >>> nREPL (cider) in Emacs. Possibly other JDK versions have more >>> optimizations? >>> >>> Thanks >>> Glen. >>> >>> On Feb 5, 2014, at 10:56 PM, David Nolen <dnolen...@gmail.com> wrote: >>> >>> (set! *unchecked-math* true) >>> (defn g ^double [^double x] (+ (Math/sin (* 2.3 x)) (Math/cos (* 3.7 >>> x)))) >>> (time (loop [i 100000000 x 0.0] (if (pos? i) (recur (dec i) (g x)) x))) >>> >>> This is nearly 50% faster than the original version on my machine. Note >>> that x is bound to 0.0 in the loop, which allows the optimized g to be >>> invoked. >>> >>> >>> On Wed, Feb 5, 2014 at 4:41 PM, Glen Fraser <hola...@gmail.com> wrote: >>> >>>> Thanks to both of you for these suggestions, they're good to know. In >>>> my specific case, setting the *unchecked-math* flag true did indeed speed >>>> things up slightly (by about 6%). The other change, though, with the >>>> double type hints (I assume that's what those are), actually ran notably >>>> slower (over 20% slower!). >>>> >>>> Glen. >>>> >>>> On Feb 5, 2014, at 8:13 PM, David Nolen <dnolen...@gmail.com> wrote: >>>> >>>> Also: >>>> >>>> (defn g ^double [^double x] (+ (Math/sin (* 2.3 x)) (Math/cos (* 3.7 >>>> x)))) >>>> >>>> >>>> On Wed, Feb 5, 2014 at 2:07 PM, Alex Miller <al...@puredanger.com>wrote: >>>> >>>>> Others have answered with many useful bits but I would mention that it >>>>> would possibly make a significant performance difference if you added >>>>> this >>>>> to your code: >>>>> >>>>> (set! *unchecked-math* true) >>>>> >>>>> >>>>>> >>>> >>> -- >>> 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 >>> 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 >>> 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. >>> For more options, visit https://groups.google.com/groups/opt_out. >>> >> >> -- 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/groups/opt_out.
