Great job finding and analysing that. I think the appropriate place to report upstream is https://bugs.chromium.org/p/v8/issues/list. Seeing as you did the hard work of finding a javascript reproduction you should submit it and get the credit, but I can if you don't want to follow up on it.
On Fri, Feb 19, 2016 at 4:47 AM, Francis Avila <fav...@breezeehr.com> wrote: > At http://dev.clojure.org/jira/browse/CLJS-1574 I added a smaller > reproducible case that is pure JS. Basically all you need to do is use > triple-equal with mixed types. The first non-string compare will cause > subsequent string compares to be slow. If you use == instead there is no > slowdown. Clearly a chrome/v8 issue. > > This code isn't hot, so it's not related to the higher-tier optimizing > JITs. > > On Tuesday, February 16, 2016 at 7:58:51 PM UTC-6, Stephen Nelson wrote: > > I've had an interesting day debugging a very strange performance problem > in Google Chrome. > > > > http://dev.clojure.org/jira/browse/CLJS-1574 > > > > `` > > > (test) > > cljs equiv: 0.005 seconds > > > (= :added :ns) > > false > > > (test) > > cljs equiv: 1.517 seconds > > ``` > > > > I've never heard of equality causing side-effects before. My suspicion > is a Chrome JIT bug. Has anyone seen anything like this? > > -- > Note that posts from new members are moderated - please be patient with > your first post. > --- > You received this message because you are subscribed to the Google Groups > "ClojureScript" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojurescript+unsubscr...@googlegroups.com. > To post to this group, send email to clojurescript@googlegroups.com. > Visit this group at https://groups.google.com/group/clojurescript. > -- Note that posts from new members are moderated - please be patient with your first post. --- You received this message because you are subscribed to the Google Groups "ClojureScript" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojurescript+unsubscr...@googlegroups.com. To post to this group, send email to clojurescript@googlegroups.com. Visit this group at https://groups.google.com/group/clojurescript.
