Using my timings macro:
https://gist.github.com/fsodomka/5890711
I am getting that:
- creation & derefing is 60% faster
- swapping is 25% faster
- resetting is about the same
;;;;;;;;;; volatile vs. atom ;;;;;;;;;;
(report
(timings 1e7
(deref (volatile! 42))
(deref (atom 42))))
; | :expr | :time | :ratio | :perc |
; |------------------------+-----------+--------+-------|
; | (deref (volatile! 42)) | 30.688238 | 1.0 | 39.81 |
; | (deref (atom 42)) | 77.081141 | 2.51 | 100.0 |
(report
(let [v (volatile! 42)
a (atom 42)]
(timings 1e7
(vswap! v inc)
(swap! a inc))))
; | :expr | :time | :ratio | :perc |
; |----------------+------------+--------+-------|
; | (vswap! v inc) | 136.052946 | 1.0 | 75.08 |
; | (swap! a inc) | 181.218748 | 1.33 | 100.0 |
(report
(let [v (volatile! 42)
a (atom 42)]
(timings 1e7
(vreset! v 10)
(reset! a 10))))
; | :expr | :time | :ratio | :perc |
; |----------------+-----------+--------+-------|
; | (reset! a 10) | 98.755318 | 1.0 | 96.69 |
; | (vreset! v 10) | 102.13944 | 1.03 | 100.0 |
On Thursday, September 11, 2014 6:18:08 AM UTC+2, puzzler wrote:
>
> I'm curious: how much faster are volatiles than atoms?
>
>
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