Hello Vincent,
Vincent Foley a écrit :
> Hello,
>
> For the past few days, I've been trying, unsuccessfully, to make an
> application I wrote faster. A Java program that performs, more or
> less, the same task takes 12 seconds (on my machine) to parse 1000
> files; my Clojure program takes nearly 3 minutes. This more than an
> order of magnitude slower! Using the profiling tools available with
> the JVM, I quickly determined which function was the costliest. I
> copied it into a simple script file to profile it in isolation. I
> have made the script and the profile results (long!) available at this
> URL: http://gist.github.com/82136
>
On my box nearly one half of the total time is sepent in the building of
arr (and by looking at your profiling data a good chunk of these traces
are related to this map call).
Better to get it out of the loop.
(let [arr (into-array Byte/TYPE (map byte [7 ; 1 Byte
3 0 97 0 98 0 99 ; 3 Shorts
0 0 100 100 ; 1 Integer
65 66 67 68 69 70 71 72 73 74
; 10 String
0 0 0 0 0 0 0 0 0 0 ; 10 ignored
]))
buf (ByteBuffer/wrap arr)]
(time
(dotimes [_ 10000]
(.position buf 0)
(run buf))))
Can you give the profile results for this code?
Christophe
--
Professional: http://cgrand.net/ (fr)
On Clojure: http://clj-me.blogspot.com/ (en)
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