about latest versions

[MHELHEFNY]

----- Original Message -----
From: "Tatsuro MATSUOKA" <tmacchant at yahoo.co.jp>
To: "Michael Goffioul" <michael.goffioul at gmail.com>; "MHELHEFNY"
<mhelhefny at gmail.com>
Cc: <bug at octave.org>
Sent: Saturday, April 18, 2009 4:16 AM
Subject: Re: about latest versions


> Hello
>
> Benjamin's octave-mingw will check cpu and sse2 and sse3 versions of the
ATLAS exist.
> In my computer in my my uinversity, the cpu of which is presscotte
(pentium4-HT 3.4GHz),
>  the following test have given,
>  n=2000; A=randn(n); B=randn(n);tic; C=A*B; t=toc, MFLOPS=2*n^3/t*1e-6
>  Benjamin 3.0.2 (mingw)  MFLOPS = 1973.0
>  Michael  3.0,3 (MSVC)   MFLOPS = 1845.9
>
> The results were almost the same.
>
> I do not think that Atlas of Benjamis's Octave is optimized for the older
CPUs.
>
> As a refrence, in case of self build Atlas for my computer (octave-3.0.4)
using
> mingw(gcc-4.3.2-dw2-TDM)
> MFLOPS = 4830.2
> If you want to get highest performance for matrix calculation, the octave
will be reccomended to build
> by yourself with the optimized the ATLAS (or GotoBLAS*) for you computer
system.
> However it is hard way to the beginners.
>
> *GotoBLAS can be used for the self building case because its licesence is
not compatible the GPL.
>
> Regards
>
> Tatsuro
>

Hello

as  you said on your cpu (pentium4-ht 3.4GHZ) the results were almost the
same. but alas on my cpu (pentium4 2.8GHZ) the results were different

Benjamin 3.0.2 (mingw) MFLOPS = 3580.4
Michael 3.0.3 (MSVC)   MFLOPS =318.25

which is 12 times better with mingw both versions was ready on the web. on
my computer , ver. 3.0.2 is even better two folds than on yours. That is
very strange.

Regards.
mhelhefny