Hi all,
Noticed in Clojure 1.3-Alpha8 that there is a large difference in speed when
adding two Short/TYPE arrays rather than two Integer/TYPE java arrays. Is
that something related to clojure, my code, or just a CPU-related thing when
it comes to summing. I'd like to save some memory by using shorts, but for
now that is too much of a speed sacrifice.
Using criterium, the difference
* adding int arrays: Execution time mean : 111.429525 us 95.0% CI:
(111.426342 us, 111.432155 us)
* adding short arrays: Execution time mean : 226.836034 ms 95.0%
CI: (226.824310 ms, 226.846928 ms)
(I saw no such difference in adding or multiplying floats vs doubles)
Code:
(defn plusS ^shorts [^shorts array ^shorts arr2]
"adds two Short arrays"
(amap array idx ret (short (+ (aget array idx) (aget arr2 idx)))))
(defn plusI ^ints [^ints array ^ints arr2]
"adds two Int arrays."
(amap array idx ret (+ (aget array idx) (aget arr2 idx))))
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