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List Archive: gentoo-science
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To: gentoo-science@g.o
From: "M. Edward (Ed) Borasky" <znmeb@...>
Subject: Re: lapack transition
Date: Sun, 21 Aug 2005 16:21:45 -0700

Donnie Berkholz wrote:

> I thought f95 was not only the default, but the only choice, and f77 was
> entirely gone.

Maybe ... it wasn't entirely clear to me from the discussion, which was 
relative to Atlas and (shudder) Fedora Core 4, where GCC 4 is the default.

> gcc is slotted so you can have many versions installed at the same time
> and switch with gcc-config. Just try unmasking in package.unmask and go.

In the case of Atlas, Clint Whaley tried a couple of tests with GCC 4 
and discovered on some pretty pure and simple scientific code, GCC 4 was 
quite a bit slower than 3.4 on an x86-32. He says, "stick with 3.4 for 
Atlas until 4 gets better". I don't have access to an AMD 64-bit machine 
and I don't have (legitimate, anyhow) access to an Intel x86-64 machine. 
So for now, anyhow, I can wait until all 10,000+ packages in Portage 
compile and test out with GCC 4 <ducking>
gentoo-science@g.o mailing list

lapack transition
-- Peter Bienstman
Re: lapack transition
-- M. Edward (Ed) Borasky
Re: lapack transition
-- Donnie Berkholz
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Updated Jun 17, 2009

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