Re: 2.1.64 compilation flags under mac os X

[Samir Sharshar]

Hi all,

Le 23 déc. 04, à 22:33, Joe Koski a écrit :

> on 12/23/04 1:32 PM, Samir Sharshar at address@hidden wrote:

> Samir,
>
> Congratulations on your success. I'm sure it took some time to get all 
> those
> options to work properly.

Yes... although I'm a regularly octave user, I'm not familiar with C, 
C++ and compilation tricks... So, congratulations to all guys of the 
list whose help me...

> Even the GNU Fortran manual cautions about the careful use of the -O5
> option. Please tell us if you see any problems with the highly 
> optimized gcc
> or g77 routines. Such problems may suddenly appear in routines that 
> are not
> often used. Have you run a "make test" on the final compilation?

The routines I use call to fft, pca and some statistical routines... 
(I'm working on biomedical signals). These routines are also used on 
some Intel and AMD machines based on Linux... I could compare the 
results in this manner. I've posted a few days ago, some results of PCA 
computations that differ from a couple Machine/OS to another...

> Also, have you been able to build octave-forge the same way?

Yes. I take the last octave-forge.tar.gz from sourceforge and compile 
the tarball with the same flags without any problem.

> Thanks for your time and efforts. Mac users will be able to put them 
> to good
> use.

It seems to me that G4/G5 processors are helped a lot with the altivec 
routines... In fact, as underlined by Per, octave compilation on mac os 
X do not "really" enable autovectorization yet. So, perfs (as I could 
judge) are equal to a PIV 3.2 GHz with the flags I've setted. Perharps 
in incoming gcc versions, fine tuning will be possible...

But, as a fan linux user, I think Mac OSX is a great OS ;-)
> Happy holidays.

You too.

> Joe
Samir



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