On Sunday, April 17, 2016 at 4:23:32 PM UTC-5, JvJ wrote: > > Orders of magnitude? Is it even worth running things in parallel in this > case? >
I got a 2X-5X speed improvement with pmap, but as adrian says, it depends. The nice thing about pmap, though, is that using it just involves adding a "p" to the front of a map call. So if you're already using map for something, it's easy to test whether pmap helps (preferably using Criterium <https://github.com/hugoduncan/criterium>). One thing that can help make pmap worthwhile is rearranging code so that the function passed to a single map/pmap call does a lot of work with each element of the collection passed to it. If the amount of computation for each element is sufficiently high, pmap will be faster. e.g. rather than (map f1 (map f2 (map f3 my-collection))), do (map (comp f1 f2 f3) my-collection), and then try adding the "p" on the front. This avoids constructing unnecessary intermediate sequences, too. -- 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.
