BTW, I can't even reproduce the examples here:
http://clojure.org/Transients#toc5
On Sunday, November 4, 2012 6:49:50 PM UTC+8, Marko Kocić wrote:
>
>
>
> On Sunday, November 4, 2012 11:41:23 AM UTC+1, Satoru Logic wrote:
>>
>>
>>
>> On Sunday, November 4, 2012 6:20:37 PM UTC+8, Marko Kocić wrote:
>>>
>>> I get big fluctuation in results for bot naive-into and into, ranging
>>> from 400ms to 1500ms.
>>> This is probably because of the GC kicking in and influencing timings.
>>>
>>> Changing timings to something like:
>>> (System/gc) (time (do (into #{} (range 1e6)) nil))
>>> and
>>> (System/gc) (time (do (naive-into #{} (range 1e6)) nil))
>>> gives much more consistent results with almost no variance, and on my
>>> box I get ~380 for into, and ~580 for naive-into
>>>
>>
>> I still can't get consistent results with this.
>>
>> BTW, what does System/gc do, I can't use `doc` on it.
>>
>>
> System/gc is a call to Java System.gc() which basically hints the JVM to
> run garbage collector. Whether it will actually run it depends on many
> factors, like your java version, various GC settings and memory settings.
> If you don't specify those settings on the cmdline, java decides on its own
> based on your system. It is quite possible that it just has to trigger
> garbage collector during execution of timing on your system, while it
> doesn't have to on my system. I'm running jdk 1.7 on 64bit linux, btw.
>
> You can find more details of GC tuning here:
> http://www.oracle.com/technetwork/java/javase/gc-tuning-6-140523.html
>
> Cheers,
> Marko
>
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