From:	Douglas Sievers <dsievers{at}ucla.edu>
Date:	Wed, 28 Apr 2004 11:13:35 -0700
Subject:	Summary: Gaussian 03 32-bit binaries on AMD 64

All,

Here is a summary of replies to my original message (bottom).
Summarizing an answer, the 32-bit binaries run without a hitch on SuSe
linux on AMD64. Also, there is a response from Gaussian stating that
they will not test or support Fedora, and they also suggest using SuSe
linux.

Reply 1
---------------------------
Hi Doug,

we have a cluster built with 2 GHz AMD Opteron processors.  We have run
the 32-bit binaries of Gaussian98 on this system without any problems.
Other program's 32-bit binaries have also run without a hitch on this
system (as advertised by AMD).  We are running SuSE Enterprise and like
it alot (system admin is very intuitive).

good luck,

Kirk Peterson
----------------------------

Reply 2 (from Gaussian support)
----------------------------

  Dr. Sievers,

   We have tested 32 bit binaries and with some versions of Linux they do run.
It is a big waste since you won't have access to one of the best features, large
disk files and larger memory because of 64 bit addressing.  We are finishing the
Opteron port and it will be available in our next minor revision.   It will be
available as an additional platform addendum to your existing license at that
time.

   We have tested with SuSE Linux.  Given that Fedora is not going to be a
supported OS from RedHat we don't plan on testing or supporting it. I highly
recommend you look into SuSE.  We are using the Portland Group compilers but if
you stick with a binary license that is not an issue. We will have details on
what we tested and support at release.
----------------------------

Reply 3
----------------------------

Dear Doug,

  I got forwarded your e-mail by a friend. We are running 32bit binaries
on 64bit processors. We have not had any major problems with the recent
operating system releases SuSe 64 bit linux. We have used binaries
supplied on the Gaussian CD (i.e. precompiled binaries) and they work
fine.  We have used old G98 binaries from a 32bit Red Hat system and
they work fine.  The only thing that might be a problem is that we have
not been able to get a file bigger than 2GB. This is a limitation of the
32 bit binaries.

Does this help?

Regards
 Mark Vincent

P.S. I should state there was an initial problem with the 64b operating
system, but it is fine now.
-----------------------------------------------------



 > Hi CCLers,
 >
 > I am planning to build a workstation with an AMD Athlon 64 Processor
(3400+ to be specific). My university
 > has a site-license for Gaussian  03, but we do not have the source
code (at least I do not believe we  do).
 >
 > I have binaries available for Intel and AMD 32-bit architecture
under  Linux. Supposedly, the Athlon 64
 > processors can run 32 bit and 64 bit  applications. I was wondering
if anyone has had experience running
 > 32-bit Gaussian binaries on one of these 64-bit(32-bit compatible)
systems.
 >
 > I am not so much worried about optimizing performance of Gaussian,
as  I am in the operability of
 > GaussView and Gaussian itself. I am  planning to run the calculations
on a separate cluster, unless they
 > are small or test calculations that could be handled by a single CPU
efficiently.
 >
 > Please include what OS you are using in the reply. I would likely
choose Fedora Core 1 for AMD64 as
 > my platform, although I am open to  suggestions for alternatives.
 >
 > Thank you all!
 >
 > Doug Sievers



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