I've added some discussion about this behavior in an example for clojure.core/future on ClojureDocs.org here:
http://clojuredocs.org/clojure_core/clojure.core/future Since people often come across this behavior when using pmap or clojure.java.shell/sh, which are implemented using Clojure futures, I've added examples to those two functions that recommend reading the examples for future. Andy On May 8, 2012, at 11:18 AM, Andy Fingerhut wrote: > Not desired, but currently normal behavior. > > This happens whenever certain concurrency features of Clojure are used, > creating other threads, and they take a while for them to be cleaned up on > exit. Besides pmap, futures and a few other Clojure functions cause this. > You can work around it if you call (shutdown-agents) before the end of your > program. > > http://dev.clojure.org/jira/browse/CLJ-124 > > Andy > > > On May 7, 2012, at 3:16 PM, Muharem Hrnjadovic wrote: > >> Hello there! >> >> I only started learning Clojure today, so please forgive me if this is >> a stupid question or something.. >> >> I am experimenting with Clojure's pmap operator as shown in the source >> here: >> >> https://github.com/freizeit/exercises/blob/master/cj-a-store-credit/clojure/ex1.clj >> >> With line 14 (the exit() call) in place the program takes a second to >> run: >> >> $ time clojure -m ex1 /etc/motd >> #<LinkedBlockingQueue [110, 60]> /etc/motd >> >> real 0m1.013s >> user 0m1.284s >> sys 0m0.032s >> >> With line 14 commented out or removed the program prints this part >> immediately: >> >> $ time clojure -m ex1 /etc/motd >> #<LinkedBlockingQueue [110, 60]> /etc/motd >> >> *but* the rest comes a minute later: >> >> real 1m0.997s >> user 0m1.336s >> sys 0m0.080s >> >> Is this normal/desired behaviour? If not, can somebody please explain >> why this is happening? Thanks! >> >> FWIW, I am observing this with Clojure 1.3.0 on debian (LMDE [1]). >> >> [1] http://www.linuxmint.com/download_lmde.php >> >> Best regards/Mit freundlichen Grüßen >> >> -- >> Muharem Hrnjadovic <m...@foldr3.com> >> Public key id : B2BBFCFC >> Key fingerprint : A5A3 CC67 2B87 D641 103F 5602 219F 6B60 B2BB FCFC >> > -- 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
