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mdaley/Bit of clojure performance

Last active January 8, 2016 14:38
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Bit of clojure performance
Creation of lots of Integer instances:
(time (reduce + (range 1000000)))
~ 25 - 35 ms
Using primitive types:
(time (loop [x 0 acc 0] (if (>= x 1000000) acc (recur (inc x) (+ acc x)))))
~ 3 - 4 ms (!!)
Unchecked (dangerous!) arithmetic:
(time (loop [x (int 0) acc (int 0)] (if (>= x 1000000) acc (recur (unchecked-inc x) (unchecked-add acc x)))))
~ 1.5 ms
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