From chemistry-request@server.ccl.net Sun May 19 04:27:35 2002
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Date: Sun, 19 May 2002 10:27:24 +0200
To: chemistry@ccl.net
Cc: Matt Zwier <matthew.zwier@hope.edu>
Subject: Re: CCL:G98: 64-bit file pointers on ia32 architectures
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In-Reply-To: <3CE4F01B.19471.1D1F8816@localhost>; from matthew.zwier@hope.edu on Fri, May 17, 2002 at 11:57:15AM -0400
From: Malcolm Gillies <malcolm@kemi.dtu.dk>

On Fri, May 17, 2002 at 11:57:15AM -0400, Matt Zwier wrote:
> Earlier in the week we ran into the infamous 2GB file limit with G98 
> on Linux (i686).  I've searched the G98 site and the CCL archive, 
> and while it's clear that the kernel and libc both support 64-bit file 
> positions, it's much less clear how to get G98 to use them.  Does 
> this mean writing a replacement FORTRAN IO library?  Or does it 
> just mean setting some compile-time flag and rebuilding G98?  Has 
> anybody conquered this problem?  Is there *any* way other than 
> just splitting our rwf files, something that hasn't worked too well for 
> us?

It is possible to modify the G98 makefile so it will compile using
the Linux Large File Support on Intel x86 architecture 32-bit machines.
I have successfully done this using the Intel Fortran Compiler, following
the advice of Nakata Maho who has looked into this quite extensively.
This circumvents the 2GB file limit (assuming you are using a recent
Linux kernel and C library) giving you a 16GB scratch file limit instead.
Compilation in full 64-bit mode gets around this limit too, but apparently
results in an extreme drop in performance on x86 processors, which
cannot deal with 64-bit integers very efficiently.

You could try contacing Nakata Maho <chat95@mbox.kyoto-inet.or.jp>
directly, but he is keen not to upset Gaussian Inc. who apparently
don't like this kind of information to circulate too freely.

cheers,

Malcolm
--
Malcolm Gillies <malcolm.gillies@kemi.dtu.dk>
Post-doctoral researcher
Organic Chemistry, Dept Chemistry,
Technical University of Denmark

From chemistry-request@server.ccl.net Sun May 19 10:41:25 2002
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Subject: Gaussian98_CI_matrix of dipoles
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Greetings. When i do CI calculations using the 
Gaussian98 program this program it just prints the 
moments of transitions of among the states, but it 
doesn't supply the dipoles moments of each state. 
Somebody could explain to me as obtaning, using the 
Gaussian98 program, the dipoles moments of all the CI-
states (I need the complet dipole´s matrix). I am very 
thankful to who can help me.

Respctfully,

Wagner (diracfock@bol.com.br)

 
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From chemistry-request@server.ccl.net Sun May 19 10:47:28 2002
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Date: Sun, 19 May 2002 16:47:40 +0200
From: Stanislav Ivan <stanislav.ivan@unibas.ch>
Subject: restart G3 calc.
To: chemistry@ccl.net
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Dear CCL'ers,
I am trying to restart partially-completed G3 calculation from its
checkpoint file.
But the keyword ' restart '  doesn't work.
Does anybody have an idea ?
Thank you in advance.

Stan


--
Stanislav Ivan
Institut für Organische Chemie
St. Johanns Ring 19
4056 Basel
Switzerland

Tel.: (+41) (61) 267 11 44
E-mail: stanislav.ivan@unibas.ch




From chemistry-request@server.ccl.net Sun May 19 14:29:12 2002
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Subject: G98:  64-bit file pointers on ia32
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Thank you, everyone who has responded or will yet respond.  I am 
looking into some of the options now, and will summarize soon.

Matt Zwier



--
Matthew Zwier (matthew.zwier@hope.edu)
Department of Chemistry Undergraduate Researcher
Hope College, Holland, MI

From chemistry-request@server.ccl.net Sun May 19 15:34:51 2002
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From: "Roma Oakes" <r.e.oakes@btconnect.com>
To: "ccl" <chemistry@ccl.net>
Subject: Re:g98 Symmetry
Date: Sun, 19 May 2002 20:33:41 +0100
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Dear All

thanks to all who responded to my question about symmetry in G98. I have
been sent a few files, some with C2 symmetry and one with D2, I'll be trying
them all, but they have certainly helped a lot. Mind you, one of the jobs
(that had started with C2 symmetry) had been going along very well when it
crashed with; (I had used iop(2/17=1, 2/16=3)

Leave Link  103 at Sun May 19 17:48:29 2002, MaxMem=   73400320 cpu:
51.0
 (Enter C:\G98W\l202.exe)
 Stoichiometry    C36H46N4
 Framework group  D2[C2'(N.N),C2"(NH.HN),X(C36H44)]
 Deg. of freedom   63
 Full point group                 D2      NOp   4
 Omega: Change in point group or standard orientation.

 Largest Abelian subgroup         D2      NOp   4
 Largest concise Abelian subgroup D2      NOp   4
 Operation on file out of range.
FileIO: IOper= 1 IFilNo(1)=  -579 Len=         172 IPos=           0 Q=
56304400


 (a lot of stuff about dumping files)

 Number           0
 Base         20480
 End          66048
 End1         66048
 Wr Pntr      20480
 Rd Pntr      20480
 Error termination in NtrErr:
 NtrErr Called from FileIO.

I've restarted it but don't really know what the error means

Regards   Roma


