Clojure creates class not for every function call, but for every function definition.
The PermGen growth you see is the REPL compiling your input, most likely. On Sun, Jan 25, 2009 at 8:26 AM, Greg Harman <ghar...@gmail.com> wrote: > > I'm trying to debug a problem in one of my programs in which PermGen > usage grows with and during each run (cumulatively within the same > REPL session) until I eventually run out & get the out of memory JVM > exception. So I wrote the following utility just to help me track > usage while I hack: > > (defn permGen > [] > (let [beans (java.lang.management.ManagementFactory/ > getMemoryPoolMXBeans)] > (doseq [mx beans] > (when (= "Perm Gen" (.getName mx)) > (println (.getUsage mx)))))) > > I ran this several times in succession: > > gp=> (permGen) > #<MemoryUsage init = 16777216(16384K) used = 11035288(10776K) > committed = 16777216(16384K) max = 67108864(65536K)> > nil > gp=> (permGen) > #<MemoryUsage init = 16777216(16384K) used = 11036888(10778K) > committed = 16777216(16384K) max = 67108864(65536K)> > nil > gp=> (permGen) > #<MemoryUsage init = 16777216(16384K) used = 11038488(10779K) > committed = 16777216(16384K) max = 67108864(65536K)> > nil > gp=> (permGen) > #<MemoryUsage init = 16777216(16384K) used = 11040088(10781K) > committed = 16777216(16384K) max = 67108864(65536K)> > > The thing to notice is that the used PermGen has grown by 1-2K with > each run (I ran it many more times than I pasted, and that growth rate > seems pretty steady). What I don't understand is why. If I understand > PermGen correctly, it holds class definitions. In Clojure classes are > only generated with calls to fn (see > http://groups.google.com/group/clojure/browse_thread/thread/2c66650b9057f760/11a09103da821264?lnk=gst&q=permgen#11a09103da821264), > and I don't have any sort of nested function creation inside my > (permGen) function. > > I don't have any anonymous function definitions in my function, so > what is causing the used PermGen growth? > > thanks, > Greg > > > -- Venlig hilsen / Kind regards, Christian Vest Hansen. --~--~---------~--~----~------------~-------~--~----~ 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 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 -~----------~----~----~----~------~----~------~--~---
