Clojureで再代入っぼい処理の速度比較 | Codetter（こーどったー）

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(println "def")
(def seed 256)
(dotimes[i 3]
    (def rnd seed)
    (time(loop[i 0](when(< i 10000000)
        (def rnd (mod (+(* 7 rnd) 13) 9564))
        (recur(inc i))
    )))
    (println rnd)
)
(println "with-local-vars")
(dotimes[i 3]
    (with-local-vars [rnd seed]
        (time(loop[i 0](when(< i 10000000)
            (var-set rnd (mod (+(* 7 @rnd) 13) 9564))
            (recur(inc i))
        )))
        (println @rnd)
    )
)
(println "atom")
(dotimes[i 3]
    (let [rnd (atom seed)]
        (time(loop[i 0](when(< i 10000000)
            (reset! rnd (mod (+(* 7 @rnd) 13) 9564))
            (recur(inc i))
        )))
        (println @rnd)
    )
)
(println "volatile!")
(dotimes[i 3]
    (let [rnd (volatile! seed)]
        (time(loop[i 0](when(< i 10000000)
            (vreset! rnd (mod (+(* 7 @rnd) 13) 9564))
            (recur(inc i))
        )))
        (println @rnd)
    )
)
(println "ref")
(dotimes[i 3]
    (let [rnd (ref seed)](dosync
        (time(loop[i 0](when(< i 10000000)
            (ref-set rnd (mod (+(* 7 @rnd) 13) 9564))
            (recur(inc i))
        )))
        (println @rnd)
    ))
)
(println "recur")
(dotimes[i 3]
    (let [rnd "recur"]
        (time(let [
            rnd (loop[i 0,rnd seed](if(< i 10000000)
                (recur(inc i) (mod (+(* 7 rnd) 13) 9564))
                rnd
            ))
        ]
            (println rnd)
        ))
    )
)
;インクリメント
;def
;"Elapsed time: 3512 msecs"
;20000000
;"Elapsed time: 3525 msecs"
;20000000
;"Elapsed time: 3498 msecs"
;20000000
;with-local-vars
;"Elapsed time: 3581 msecs"
;20000000
;"Elapsed time: 3501 msecs"
;20000000
;"Elapsed time: 3579 msecs"
;20000000
;atom
;"Elapsed time: 1608 msecs"
;20000000
;"Elapsed time: 1632 msecs"
;20000000
;"Elapsed time: 1609 msecs"
;20000000
;volatile!
;"Elapsed time: 1262 msecs"
;20000000
;"Elapsed time: 1264 msecs"
;20000000
;"Elapsed time: 1258 msecs"
;20000000
;ref
;"Elapsed time: 2442 msecs"
;20000000
;"Elapsed time: 2441 msecs"
;20000000
;"Elapsed time: 2427 msecs"
;20000000
;recur
;20000000
;"Elapsed time: 139 msecs"
;20000000
;"Elapsed time: 136 msecs"
;20000000
;"Elapsed time: 140 msecs"
;線形合同法
;def
;"Elapsed time: 6431 msecs"
;9332
;"Elapsed time: 6395 msecs"
;9332
;"Elapsed time: 6392 msecs"
;9332
;with-local-vars
;"Elapsed time: 6519 msecs"
;9332
;"Elapsed time: 6567 msecs"
;9332
;"Elapsed time: 6421 msecs"
;9332
;atom
;"Elapsed time: 4394 msecs"
;9332
;"Elapsed time: 4405 msecs"
;9332
;"Elapsed time: 4384 msecs"
;9332
;volatile!
;"Elapsed time: 4014 msecs"
;9332
;"Elapsed time: 4050 msecs"
;9332
;"Elapsed time: 3993 msecs"
;9332
;ref
;"Elapsed time: 5260 msecs"
;9332
;"Elapsed time: 5257 msecs"
;9332
;"Elapsed time: 5318 msecs"
;9332
;recur
;9332
;"Elapsed time: 3492 msecs"
;9332
;"Elapsed time: 3478 msecs"
;9332
;"Elapsed time: 3470 msecs"
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