Are you using a version of Java earlier than 7u6? If so, this *might* be
related to the conversation from a few days ago about functions like subs,
re-find, etc. returning short strings that keep references to the longer
strings they were created from:
https://groups.google.com/forum/#!topic/clojure/PeHTCWNgrL0
Even if you are using such a Java version, I have not confirmed whether the
function clojure.tools.reader.edn/read-string returns substrings of the
input string.
One quick thing to try that might help is to call
clojure.tools.reader.edn/read on the File object f directly, without
calling slurp. That will at least avoid the behavior of creating big
strings with the entire contents of each file. It should also avoid the
"small substrings holding references to large original strings", if that is
indeed what you are experiencing.
Andy
On Mon, Sep 16, 2013 at 8:17 AM, Joachim De Beule <
joachim.de.be...@gmail.com> wrote:
> Dear List,
>
> I'm experiencing a memory leak and I don't understand why.
>
> I have a bunch of 50 files on disk called "data-1.edn" through
> "data-50.edn". I perform the following code:
>
> (def all-processed-data (reduce (fn [ret f] (merge ret (process-data
> (clojure.tools.reader.edn/read-string (slurp f))))) {} file-list))
>
> "file-list" is a sequence of java.io.File objects pointing towards the 50
> data files.
> "process-data" is a function that produces a map from the data read.
>
> Although each individual datafile is about 100 Megabytes, the result of
> processing a datafile is a map of about 200k only, so that the map returned
> by the entire above expression is only about 10 Megabytes. Nevertheless,
> executing the above code fills up memory and eventually stops clojure from
> functioning. Why?
>
> Thanks a lot for any suggestions!
>
> Joachim.
>
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