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
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