It seems to be something about the jdbc/transaction macro. If I rewrite
load_exp so it does nothing but walk the seq, it still consumes the heap:
(defn load-exp [file timestamp filehash matrix]
(jdbc/transaction
(dorun (map identity matrix))))
If I remove the jdbc/transaction call, it's fine.
(defn load-exp [file timestamp filehash matrix]
(dorun (map identity matrix)))
On Tuesday, September 10, 2013 3:24:29 PM UTC-7, Brian Craft wrote:
>
> Trying jhat now, reference chain here:
>
> --> cavm.h2$load_exp$fn__165@0x2aaab4b04660 (56 bytes) (field matrix:)
> --> clojure.lang.LazySeq@0x2aaab4b05388 (48 bytes) (field s:)
> --> clojure.lang.Cons@0x2aaab4b0fe08 (48 bytes) (field _more:)
> --> clojure.lang.LazySeq@0x2aaab4b10330 (48 bytes) (field s:)
> --> clojure.lang.Cons@0x2aaab6543ec0 (48 bytes) (field _more:)
>
> This looks to me like the head is being retained as a parameter to a
> function. load_exp signature is like so:
>
> defn load-exp [file timestamp filehash matrix]
>
> But surely passing a seq to a function doesn't retain the head?
>
> Here's the body of the function:
>
> (defn load-exp [file timestamp filehash matrix]
> (kdb/transaction
> (let [cid (merge-cohort file)
> exp (merge-exp file (format-timestamp timestamp) filehash cid)
> sids (load-samples cid (:samples (meta matrix)))]
> (load-exp-samples exp sids)
> (load-exp-matrix exp matrix))))
>
>
> load-exp-matrix calls (dorun (map)) on matrix. There's one other reference
> here, where we pull the metadata. Does any of this retain the head?
>
> On Tuesday, September 10, 2013 2:36:29 PM UTC-7, Brian Craft wrote:
>>
>> From jmap output it's pretty clear I'm retaining the head of a seq
>> somehow, but I have no idea how, or where. Is there any way to find the
>> reference, besides staring at code waiting for enlightenment?
>>
>
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