Doing some simple microbenchmarks, I found something unexpected:
(time
(let [v (volatile! 1)]
(dotimes [x 100000000]
(vreset! v @v))))
"Elapsed time: 1016.992146 msecs"
(time
(let [v (java.util.concurrent.atomic.AtomicLong. 1)]
(dotimes [x 100000000]
(.set v (.get v)))))
"Elapsed time: 672.869727 msecs"
(time
(let [v (java.util.concurrent.atomic.AtomicReference. {})]
(dotimes [x 100000000]
(.set v (.get v)))))
"Elapsed time: 678.143133 msecs"
(time
(let [v (atom 1)]
(dotimes [x 100000000]
(reset! v @v))))
"Elapsed time: 1100.689493 msecs"
I expected volatile's to be faster. Maybe I'm not understanding the correct
use case for volatiles but java.util.concurrent.atomic.Atomic* seems to be
clearly the most performant. Given the downsides of using volatiles, is
their existence justified when safer and faster alternatives exist?
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