Hi Robert,
I tracked down the source of the StackOverflowError in my code. It
boils down to the following similar (to your example) code snippet.
Although, on my machine, this example gives the stack overflow, rather
than the OOM error.
(def acoll (ref []))
(doseq [i (range 1 3000)]
(println "i:" i)
(dosync
(alter acoll concat [i])))
(println "count:" (count @acoll))
You can avoid this stack overflow with a "doall" or just replacing
"concat [i]" with "conj i".
This seems obvious in hind-sight of course...
Thanks for your help.
Kyle
On Jan 18, 6:36 am, kirschkernkissen <robert.ste...@gmail.com> wrote:
> Hi Kyle!
>
> I encountered the same problem:
>
> (defn stack-fail
> "returns an empty lazy seq"
> [l i]
> (if (> i 0)
> (recur (remove #{1} (concat l '(1))) (dec i))
> l))
>
> (def foo (stack-fail () 1000))
>
> foo
> ; Evaluation aborted.
>
> if you call a non-lazy function (e.g. doall) on the collection from
> time to time this wont happen.
>
> Rgds, Robert
>
> On 15 Jan., 00:05, mudphone <kyle...@gmail.com> wrote:
>
>
>
> > Is it possible that the Clojure core seq function can cause a stack
> > overflow (since it calls itself)?
>
> > Or is there some other manner in which misuse of a lazy seq could
> > cause this? In the stack trace below, I'm seeing repeated calls to
> > "seq" in clojure core, until the stack is blown.
>
> > Thanks,
> > Kyle
>
> > Exception in thread "main" java.lang.StackOverflowError
> > (session_master_boot.clj:19)
> > at clojure.lang.Compiler.eval(Compiler.java:4617)
> > at clojure.lang.Compiler.eval(Compiler.java:4593)
> > at clojure.lang.Compiler.load(Compiler.java:4931)
> > at clojure.lang.Compiler.loadFile(Compiler.java:4898)
> > at clojure.main$load_script__6637.invoke(main.clj:210)
> > at clojure.main$init_opt__6640.invoke(main.clj:215)
> > at clojure.main$initialize__6650.invoke(main.clj:243)
> > at clojure.main$null_opt__6672.invoke(main.clj:268)
> > at clojure.main$legacy_script__6687.invoke(main.clj:299)
> > at clojure.lang.Var.invoke(Var.java:359)
> > at clojure.main.legacy_script(main.java:32)
> > at clojure.lang.Script.main(Script.java:20)
> > Caused by: java.lang.StackOverflowError
> > at clojure.core$seq__3835.invoke(core.clj:103)
> > at clojure.core$concat__3960$fn__3970.invoke(core.clj:427)
> > at clojure.lang.LazySeq.sval(LazySeq.java:42)
> > at clojure.lang.LazySeq.seq(LazySeq.java:56)
> > at clojure.lang.RT.seq(RT.java:440)
> > at clojure.core$seq__3835.invoke(core.clj:103)
> > at clojure.core$concat__3960$fn__3970.invoke(core.clj:427)
> > at clojure.lang.LazySeq.sval(LazySeq.java:42)
> > at clojure.lang.LazySeq.seq(LazySeq.java:56)
> > at clojure.lang.RT.seq(RT.java:440)
> > at clojure.core$seq__3835.invoke(core.clj:103)
> > at clojure.core$concat__3960$fn__3970.invoke(core.clj:427)
> > at clojure.lang.LazySeq.sval(LazySeq.java:42)
> > at clojure.lang.LazySeq.seq(LazySeq.java:56)
> > at clojure.lang.RT.seq(RT.java:440)
> > at clojure.core$seq__3835.invoke(core.clj:103)
> > at clojure.core$concat__3960$fn__3970.invoke(core.clj:427)
> > at clojure.lang.LazySeq.sval(LazySeq.java:42)
> > at clojure.lang.LazySeq.seq(LazySeq.java:56)
> > at clojure.lang.RT.seq(RT.java:440)
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