Created
June 28, 2013 22:15
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I indendet to see how to use fold to utilize pralell processing just to see that its prallel without the use of fold and pmap :/
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| (ns reducers.core | |
| ;(:require [clojure.core.reducers :as r]) | |
| ) | |
| (def N (iterate inc 0)) | |
| (def finish 6e6) | |
| ; this is just for testing if a random map function will stop the parelleltiy | |
| (defn only-even [x] | |
| (if (even? x) | |
| x | |
| 0)) | |
| (time (reduce + (map only-even (take finish N)))) ; "Elapsed time: 50830.559 msecs" 999999000000 |
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This may be a bit better for comparison,
(time (->> (range 6e6) vec (filter even?) (reduce +))) ;; "Elapsed time: 1894.056685 msecs" 8999997000000
(time (->> (range 6e6) vec (r/filter even?) (r/fold +))) ;; "Elapsed time: 1697.588728 msecs" 8999997000000