Fwd: Re: Opinion question (Core2 Duo)
I have just completed unrestricted MP2/6-31G* energy procedure (after
DFT/M05-2X) for a 98-atoms (first row) molecule in 19 hours with four-node
amd64 Debian amd64 etch, NWChem suite. I understand (if I understand correctly)
from your email that should I have had Core 2 I would not have had the time to
take a coffee in between launching the MP2 procedure and getting the
computational results. Interesting.
Thanks
francesco pietra
> --- Jo Shields <jo.shields@oerc.ox.ac.uk> wrote:
>
> > Subject: Re: Opinion question (Core2 Duo)
> > From: Jo Shields <jo.shields@oerc.ox.ac.uk>
> > To: debian-amd64 <debian-amd64@lists.debian.org>
> > Date: Tue, 18 Sep 2007 15:51:34 +0100
> >
> >
> > On Tue, 2007-09-18 at 10:41 -0400, Lennart Sorensen wrote:
> > > On Tue, Sep 18, 2007 at 03:08:48PM +0100, Jo Shields wrote:
> > > > Or more? Buy an Altix! ;)
> > >
> > > Ehm, well the Altix uses either the itanium (why would anyone want that
> > > crap) or a dual socket core 2 based cpu. That hardly matches a 4 or
> > > more cpu opteron server.
> >
> > Let's assume I have large examples of both IA64 and AMD64. Plus further
> > benchmark data we collected ourselves.
> >
> > IA64 is fast, for floating point code. On paper, it offers the same
> > per-core-per-Hz FLOP count as Core (twice that of AMD64). And in
> > practise, Altix scales, whilst the competition, well, doesn't. In our
> > benchmarks, IA64 was not only faster per-GHz than POWER5 or AMD64, but
> > faster in absolute terms too, with an 8-way test absolutely dominated by
> > a 1.6-GHz-Montecito-based Altix, whilst AMD64 didn't even register a
> > pulse.
> >
> > However, for IA64, compiler choice is key - using GCC to compile test
> > code isn't just crippling the system, it's throwing away hundreds of
> > thousands (if not more) of investment
> >
> > > SGI has nothing of any real interest. No wonder they went under not
> > > that long ago. :)
> >
> > They've got SMP machines that don't choke at >4 cores. For some
> > applications, that's of great interest.
> >
> > --
> > ______________________________
> > / Jo Shields <jms@osc.ox.ac.uk> \
> > | Systems Manager, |
> > \ Oxford Supercomputing Centre /
> > -------------------------------
> > \ ,__,
> > \ (oo)___
> > (__) )\
> > ||--|| *
> >
> >
> > --
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> >
>
>
>
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>
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