These are my results using (dotimes (time (dotimes ...))) combo to get
consistent results:
- on sets:
(dotimes [i 10] (time (dotimes [j 100] (into #{} (range 1e4)))))
"Elapsed time: 388.595226 msecs"
"Elapsed time: 406.666801 msecs"
"Elapsed time: 421.559753 msecs"
"Elapsed time: 444.719263 msecs"
"Elapsed time: 431.319374 msecs"
"Elapsed time: 392.3779 msecs"
"Elapsed time: 392.382365 msecs"
"Elapsed time: 408.71734 msecs"
"Elapsed time: 444.203973 msecs"
"Elapsed time: 442.351363 msecs"
(dotimes [i 10] (time (dotimes [j 100] (naive-into #{} (range 1e4)))))
"Elapsed time: 1287.412806 msecs"
"Elapsed time: 1318.931199 msecs"
"Elapsed time: 1314.773064 msecs"
"Elapsed time: 1292.664029 msecs"
"Elapsed time: 1277.616099 msecs"
"Elapsed time: 1289.514678 msecs"
"Elapsed time: 1700.74875 msecs"
"Elapsed time: 1352.734662 msecs"
"Elapsed time: 1464.09882 msecs"
"Elapsed time: 1449.704738 msecs"
- on vectors:
(dotimes [i 10] (time (dotimes [j 100] (into [] (range 1e4)))))
"Elapsed time: 307.838501 msecs"
"Elapsed time: 243.426624 msecs"
"Elapsed time: 234.013566 msecs"
"Elapsed time: 247.711805 msecs"
"Elapsed time: 253.154264 msecs"
"Elapsed time: 284.375476 msecs"
"Elapsed time: 227.773865 msecs"
"Elapsed time: 247.807286 msecs"
"Elapsed time: 240.959477 msecs"
"Elapsed time: 230.627513 msecs"
(dotimes [i 10] (time (dotimes [j 100] (naive-into [] (range 1e4)))))
"Elapsed time: 406.55752 msecs"
"Elapsed time: 419.365134 msecs"
"Elapsed time: 413.544069 msecs"
"Elapsed time: 410.892756 msecs"
"Elapsed time: 394.827165 msecs"
"Elapsed time: 407.338251 msecs"
"Elapsed time: 441.60916 msecs"
"Elapsed time: 401.721826 msecs"
"Elapsed time: 412.7506 msecs"
"Elapsed time: 399.972445 msecs"
Clojure 1.4.0
java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
Java HotSpot(TM) Server VM (build 20.1-b02, mixed mode)
Cheers.
Marek.
On Sunday, November 4, 2012 3:41:14 AM UTC+1, Satoru Logic wrote:
>
> Hi, all.
>
> I am following an example demonstrating that `transient` can help optimize
> mass updates to data structures:
>
> First, a function is defined, which doesn't use transient collection:
>
> (defn naive-into
>> [coll source]
>> (reduce conj coll source))
>
>
> This is supposed to run slower than the built-in `into`, because, as the
> book said, `into` uses transient collections whenever possible.
>
> But the result shows up in my `repl` is just the reverse.
>
>
>> user=> (time (do (into #{} (range 1e6)) nil))
>> "Elapsed time: 4882.176 msecs"
>> nil
>> user=> (time (do (naive-into #{} (range 1e6)) nil))
>> "Elapsed time: 3745.707 msecs"
>> nil
>
>
> What could be the reason of this?
>
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