On 2009-08-17, at 8:58 PM, FFT <fft1...@gmail.com> wrote:
> On Mon, Aug 17, 2009 at 9:25 AM, Bradbev<brad.beveri...@gmail.com>
> wrote:
>>
>> On Aug 17, 1:32 am, Nicolas Oury <nicolas.o...@gmail.com> wrote:
>>> I was referring to the rules of the benchmark game. When you
>>> benchmark
>>> language, using another language is not fair.
>>>
>>> If you were to do your own program, of course you could use Java.
>>> However, in the particular circumstance, it is a bit annoying to use
>>> Java just to create a data structure type.
>>>
>> Ah, that makes more sense re the "cheating" then. Your insight for
>> array range check elimination got me thinking - why can't the
>> accessor
>> macros (posx, etc) that use aset/aget have their ranges eliminated by
>> the JVM? After all, it should be a simple constant fold. I found
>> another 2-3x speed up by coercing the indexes with (int x), ie
>> (defmacro mass [p] `(double (aget ~p (int 0))))
>
> I'm not seeing this. Maybe you are running this on "-client"?
I'm running Java 1.5 32bit on OS X 10.5 with -server.
>
>> I don't have the Java version running on my machine, but I saw
>> runtimes go from 833ms to 295ms for 100000 iterations, a 2.8x speed
>> up, which should put the "no cheating" version on the same standing
>> as
>> the Java implementation.
>
> You can't get a consistent timing for anything less than 1-10M
> iterations here.
Why do you think that? Everything I've read says that hotspot kicks
in at 10,000, and I always do a warmup run.
I see consistent enough timings, within 50ms each run. When coerced
ints gives an immediate 3x speedup something is happening. What JVM
are you running & what settings? I'll compile the java version soon
so I can do a direct compare on a single machine. I take it that your
setup is showing clojure 3x slower than the java version?
Brad
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