[SciPy-user] ATLAS and gcc v4.0.2

Hanno Klemm klemm at phys.ethz.ch
Tue Feb 28 02:48:12 CST 2006


Nils,

The website you cite says that the problem was fixed with version 3.1
of gcc. Why don't you just ry it and see what happens, or does the
compile break?

Hanno


Nils Wagner <nwagner at mecha.uni-stuttgart.de> said:

> Hi all,
> 
> Where can I find some hints w.r.t. to ATLAS and 
> scipy/numpy ?
> AFAIK the new website has no information on building 
> ATLAS.
> 
> Do I need version 3 of gcc ?
> 
> I am on SuSE Linux 10.0 with gcc v4.0.2
> 
> If I try to install ATLAS I get ..
> 
> Looking for compilers (this may take a while):
>     /usr/bin/gcc  : v4.0.2
>     /usr/bin/gcc  : v4.0.2
> F77 = /usr/bin/g77 -fomit-frame-pointer -O -m64
> CC = /usr/bin/gcc -fomit-frame-pointer -O -mfpmath=387 
> -m64
> MCC = /usr/bin/gcc -fomit-frame-pointer -O -mfpmath=387 
> -m64
> 
> 
> 
> ATLAS has detected that you are running on an x86 
> architecture
> (eg., Athlon, P4, PIII, etc), but do not have a pre-2.96 
> gcc installed.
> Using gcc 3/2.96 will result in a performance loss of 
> 10-20% IN THE BEST CASE
> over a gcc previous to 2.96.  If your install goes 
> slightly wrong, performance
> drops of 50% are more normal with these compilers.  Full 
> details of this
> problem can be found at:
>     http://www.cs.utk.edu/~rwhaley/ATLAS/gcc30.html
> In the meantime, we suggest you abondon this ATLAS 
> install, and install a gcc
> that delivers decent x86 performance, and restart the 
> install then.  You
> do not need to be root to install, and full instructions, 
> along with all
> needed files, are given in the ATLAS errata file at:
>     http://math-atlas.sourceforge.net/errata.html#UnixGccInst
> 
>     Stop ATLAS install? [y]:
> 
> How can I continue ?
> 
> Nils
> 
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> 



-- 
Hanno Klemm
klemm at phys.ethz.ch




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