Hashes are cached for Clojure collections, keywords and symbols, but not for strings.
I wonder if people who report these perf regressions use long string keys in their maps... For this to explain the regression they'd have to be looking up the same String objects a lot, of course (else hashCode caching wouldn't have been helpful before the move to Murmur3). On 19 March 2014 15:21, Alex Miller <a...@puredanger.com> wrote: > That is the only set of changes that I know of that negatively affect > performance in 1.6.0. However, the absolute differences are quite small and > codes are cached. It's hard for me to conjure a scenario where the resulting > effect is an overall 5-8% slowdown. If this is one, I'd like to understand > it better. > > > On Wednesday, March 19, 2014 8:28:18 AM UTC-5, Nicola Mometto wrote: >> >> >> I'm guessing it's because of the minor overhead on hashing added with >> the move to Murmur3? >> >> Alex Miller writes: >> >> > <record scratch> what's that about performance now? >> > >> > Is that something definitive and reproducible? And if so, is there any >> > way to track down a cause? > > -- > 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. -- 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.
