Transients are a performance optimization that can give quite significant performance increases when you know you will be doing many updates to a Clojure vector or map. A long sequence of updates on a transient tends to allocate much less memory than the corresponding sequence of updates on a non-transient data structure.
Andy On Wed, Apr 20, 2016 at 11:03 AM, JvJ <kfjwhee...@gmail.com> wrote: > I'm writing some code that I would like to perform as quickly as > possible. Currently, I am iterating over large hash maps and performing > assocs and dissocs. > > I don't know much about performance optimization, but I am told that > memory locality is a big factor. I would like to know how Persistent Maps, > Persistent Vectors, Transient Maps, and Transient Vectors compare to one > another in this respect. > > Also, the objects in the collection that I'm iterating over will > themselves be maps. So, if I had a vector with good memory locality, but > it stored what are effectively pointers to maps allocated elsewhere, will > that nullify the benefits of memory locality? > > Thanks > > -- > 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.
