core.sync is more about coordination and communication than about doing
things in parallel, thats just a pleasant side effect.
In your case you don't need anything core.async provides. You could either
use reducers or java.util.concurrent.ExecutorService.
(let [exec (Executors/newFixedThreadPool 4)
process (fn [it]
(.submit exec #(long-running-widget-processor it)))
get (fn [future]
(.get future))]
(->> widgets
(mapv process)
(mapv get)))
This skips the partitioning of the inputs and lets the Threadpool deal with
spreading the work. This probably is optimal to ensure that all 4 threads
are busy until all work is done. (Note: I did not run this code)
Reducers would be good if the number of items processed is large enough and
you are doing pure number crunching with no I/O. Otherwise the fork/join
probably costs too much.
HTH,
/thomas
On Friday, September 5, 2014 7:46:02 AM UTC+2, Beau Fabry wrote:
>
> Is the kinda ugly constant (doall usage a sign that I'm doing something
> silly?
>
> (let [num-workers 4
> widgets-per-worker (inc (int (/ (count widgets) num-workers)))
> bucketed-widgets (partition-all widgets-per-worker widgets)
> workers (doall (map (fn [widgets]
> (thread
> (doseq [widget widgets]
> (long-running-widget-processor widget))
> true))
> bucketed-widgets))]
> (doall (map <!! workers)))
>
> https://gist.github.com/bfabry/ad830b1888e4fc550f88
>
> All comments appreciated :-)
>
> Cheers,
> Beau
>
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