[SciPy-user] ATLAS and gcc v4.0.2

Nils Wagner nwagner at mecha.uni-stuttgart.de
Tue Feb 28 02:34:09 CST 2006


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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