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<P><FONT SIZE=2>I saw Spec benchmarks published with portions of it compiled for 32bit for best results. But the bottom line is that default in 64bit is faster and some special cases could benefit from 32bit...<BR>
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Michael<BR>
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-----Original Message-----<BR>
From: Greg Lindahl [<A HREF="mailto:greg.lindahl@qlogic.com">mailto:greg.lindahl@qlogic.com</A>]<BR>
Sent: Sunday, April 08, 2007 11:50 PM Pacific Standard Time<BR>
To: Beowulf Mailing List<BR>
Subject: Re: [Beowulf] Win64 Clusters!!!!!!!!!!!!<BR>
<BR>
On Fri, Apr 06, 2007 at 04:57:18PM -0700, Jon Forrest wrote:<BR>
<BR>
> For apps that<BR>
> don't need the extra address space, the benefits of<BR>
> the additional registers in x86-64 are nearly undone<BR>
> by the need to move more bits around,<BR>
<BR>
Man, good thing you noticed. We'll have to change the default on our<BR>
compiler, and re-run all those benchmarks in 32-bit mode. I wonder<BR>
why nobody ever noticed before?<BR>
<BR>
-- greg<BR>
<BR>
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