I'm not aware of what changes made in 1.4 could cause this performance degradation.
Out of curiosity, are you willing to share your code for performance profiling of future Clojure versions? i.e. is it open source already and so that wouldn't be a problem, or is it closed source? Have you run a profiler on your tests to see where the time is spent with Clojure 1.3 vs Clojure 1.4? Andy On Oct 2, 2012, at 4:24 PM, Karsten Schmidt wrote: > Today, I decided to finally switch one of my projects from Clojure > 1.3.0 to 1.4.0 (and test driving the 1.5.0 snapshot) but quickly found > some discouraging effects in terms of performance. The project > involves a lot of geometry and I'm using vanilla vectors for all > vector math. So far I've *not* been using any type hints or casting, > but was generally happy with the performance under 1.3.0... > > Under 1.3.0, e.g. a Delaunay triangulation of 5000 random 2D points > resulting in approx. 9450 triangles takes: > > average 422ms / minimum 393ms - version with transients: avg. 358ms / min. > 324ms > > The exact same code under 1.4.0: > > average 695ms / minimum 640ms - version with transients: avg. 672ms / min. > 616ms > > That's 1.65x slower and the only thing changed is the clojure version > number in project.clj. 1.5.0 snapshot is in the same league... :( Also > note that the impact of transients is much reduced compared to > 1.3.0... > (All stats collected over 60sec duration.) > > Has there been another overhaul or behavior change of numerics in > these recent versions? I'm really quite suprised/shocked by this find > and can't explain it to myself. I was hoping to use the library also > from CLJS in the future and hence have stayed away from adding type > hints and explicit casting... > > Thanks for any insights! > > Best, K. -- 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
