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From "Aleksey Shipilev" <aleksey.shipi...@gmail.com>
Subject Re: [perf] Comparative benchmarking
Date Tue, 06 Nov 2007 22:02:05 GMT
On 07 Nov 2007 00:27:25 +0300, Egor Pasko <egor.pasko@gmail.com> wrote:
> Vladimir, guess what? :) I actually mixed several things
> altogether.
<giggly>(sigh) As usual, miracle does not happen :) I dreamed to see
software sqrt() implementation that could be faster than hardware one.

> So, we are left with SSE asm that can be inlined by JIT and AFAI can
> see it is not as fast as HotSpot? Weird :)
No, for now we have just the intrinsic in native code, so we also have
overheads for JNI transition (and it is heavy!), parameter passing,
chains of calls, etc. I believe that sqrt() magic will lead that NBody
performance very close to RI.

BTW, in my thought this benchmark is like the top of the iceberg
called "FP performance problems".


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