[Beowulf] Win64 Clusters!!!!!!!!!!!!

Michael Will mwill at penguincomputing.com
Mon Apr 9 09:04:21 PDT 2007


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...

Michael

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 -----Original Message-----
From: 	Greg Lindahl [mailto:greg.lindahl at qlogic.com]
Sent:	Sunday, April 08, 2007 11:50 PM Pacific Standard Time
To:	Beowulf Mailing List
Subject:	Re: [Beowulf] Win64 Clusters!!!!!!!!!!!!

On Fri, Apr 06, 2007 at 04:57:18PM -0700, Jon Forrest wrote:

> For apps that
> don't need the extra address space, the benefits of
> the additional registers in x86-64 are nearly undone
> by the need to move more bits around,

Man, good thing you noticed. We'll have to change the default on our
compiler, and re-run all those benchmarks in 32-bit mode. I wonder
why nobody ever noticed before?

-- greg

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