Some additional pointers here (this is a little old though);
http://www.thebusby.com/2012/07/tips-tricks-with-clojure-reducers.html


On Fri, Apr 26, 2013 at 11:51 PM, László Török <ltoro...@gmail.com> wrote:

> Hi,
>
> Not sure what you are trying to do, but xxx is a lazy seq, thus it can
> only be consumed sequentially and fold falls back to reduce
>
> You need a vector.
>
> Las
>
> Sent from my phone
> On Apr 26, 2013 4:46 PM, "Stanislav Yurin" <jusk...@gmail.com> wrote:
>
>> I was assuming that following code will fold in parallel, but it is
>> reduced sequentially
>>
>> (require '[clojure.core.reducers :as r])
>> (defn test1
>>  [x]
>> (Thread/sleep 1000)
>>  (println (str "Finished:" x))
>> x)
>> (def xxx (r/map test1 (range 100)))
>> (r/fold + xxx)
>>
>> What am I doing wrong?
>> Thanks.
>>
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