Re: [gentoo-science] Problems emerging blas-atlas

[Jason Nielsen]

On Sun, 5 Feb 2006, Alan Jackson wrote:

> I'm having problems emerging blas-atlas-3.6.0-r1 on my AMD64 X2 system.
> The configure drops into an infinite loop :
>
> 	I am now going to ask for two C compilers, and their associated flags.
> 	The first such set (CC & CCFLAGS) are used in compiling the non-generated
> 	ATLAS code.  This code is written in normal C, and responds well to high
> 	levels of optimization.  Typically, this is set to your default compiler,
> 	and your highest levels of optimization.
>
> 	The second set of C compilers (MCC & MMFLAGS) is used to compile the generated
> 	ATLAS code.  Generated codes are written at a very low-level (think of C used
> 	as a kind of portable assembler).  On many platforms, high levels of
> 	optimization are detrimental, as the compiler tries to pipeline a perfectly
> 	pipelined code, and succeeds in reducing performance substantially (this
> 	occurs on DEC ALPHAs & Sun UltraSparcs, for instance).  If the default does
> 	not work for you, try a midrange optimization such as -O.  The generated code
> 	does not alias any output arguments, so aliasing optimizations should be OK.
>
> 	   Enter ANSI C compiler(CC) [/usr/bin/gcc]:    Enter C Flags (CCFLAGS) [-fomit-frame-pointer -O -mfpmath=387 -m64]: Compiling with = '/usr/bin/gcc -fomit-frame-pointer -O -mfpmath=387 -m64' doesn't seem to work for me.
> 	   Enter 1 to try different CC/flags, 0 to continue anyway [1]:
>
> I've turned in a bugzilla ticket - but I thought someone here might have
> a suggestion for my platform. Is there a compiler flag I should set that
> would make it happy? Mine are pretty simple : CFLAGS="-O2 -march=athlon-xp"
> This is a brand new system, so all the ebuilds from the kernel up are completely
> current.
>

Version 3.6.0 doesn't support AMD64 chips.  You need to install the 3.7.11 
devel version, it is portage but masked.  If you are looking for a high 
performance Lapack/BLAS for AMD64 you can also try the ACML library 
(http://developer.amd.com/acml.aspx).

Cheers,
Jason
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