[Wien] Optimizations for IBM p630 Power4+ anyone?

[Rossitza Pentcheva]

Hi Thorsten,

if you have a 64 bit kernel try:
FOPT =  -q64 -O3 -qarch=pwr4


Best regards,
Rossitza
Torsten Andersen wrote:

> Dear all,
>
> before I start playing with compiler options, I would like to know if 
> anyone out there has some good optimized options for the IBM p630. The 
> installation is like this:
>
> IBM p630 with 4 Power4+ and enough memory for Wien2k, I think.
> AIX 5.1 with jfs2 filesystem and the 64-bit kernel
> Fortran xlf 8.1.1
> essl 3.3
>
> I am still waiting for the essl 4.1...
>
> as a beginning, I used the default options, then "-O5 qarch=pwr4", but 
> both seems to give terribly slow code. Of course I link with the essl.
>
> Best regards,
> Torsten Andersen.
>

-- 

Dr. Rossitza Pentcheva
Department fuer Geo- und Umweltwissenschaften	phone: +49 89 2180 4352	
Sektion Oberflaechenkristallographie 		fax: +49 89 2180 4334	
Ludwig-Maximilians-Universitaet Muenchen	e-mail: pentcheva at lrz.uni-muenchen.de
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80333 Muenchen               www: http://www.krist.geo.uni-muenchen.de/ober/pentche.htm